{"as_of":"2026-07-23T03:07:00Z","caps":{"database_statements":6,"inbound":100,"outbound":100},"context_digest":"sha256:87adfc6dcd6cdaf0821d8ac3aabf9cb2934039ad7119ec97d70f3f4c8cdba98a","coverage":[{"denominator":48,"lane":"reference_resolution","note":"Typed states for the displayed outbound observations.","records_observed":48,"source":"paper_references, paper_reference_links","source_observed_at":"2026-05-25T00:54:56.610400Z","state":"measured"},{"denominator":48,"lane":"standing_notices","note":"One-hop event checks from named stored sources.","records_observed":48,"source":"scholarly_work_events, retraction_status_cache","source_observed_at":"2026-07-20T06:30:07.809122+00:00","state":"measured"},{"denominator":0,"lane":"inbound_itemization","note":"Pith citing papers itemized under the disclosed page cap.","records_observed":0,"source":"paper_references, paper_reference_links","source_observed_at":null,"state":"measured"},{"denominator":1,"lane":"external_citation_measurements","note":"A source-named dated measurement, never combined with another source.","records_observed":0,"source":"cited_works","source_observed_at":null,"state":"measured"}],"external_citation_measurements":[],"inbound":[],"links":{"evidence":"/evidence","html":"/paper/1907.03757/citation-record","integrity":"/paper/1907.03757/integrity","json":"/paper/1907.03757/citation-record.json","paper":"/paper/1907.03757"},"outbound":[{"citation":{"cited_paper":null,"cited_work":{"arxiv_id":null,"doi":null,"metadata_source":"raw_reference","pith_arxiv_id":null,"snapshot_observed_at":"2026-06-05T21:23:00.469572Z","title":"M., Chary, R","venue":null,"work_id":"6ab2bd54-0e05-47ae-97d1-bc120b273973","year":2008},"citing_paper":{"arxiv_id":"1907.03757","last_updated":"2019-07-08T18:00:00Z","snapshot_observed_at":"2026-07-06T08:05:57.037453Z","submitted_at":"2019-07-08T18:00:00Z","title":"Discovery of a close-separation binary quasar at the heart of a z~0.2 merging galaxy and its implications for low-frequency gravitational waves","version":1},"reference_index":1,"source":"pdf_text","source_observed_at":"2026-05-25T00:54:56.610400Z"},"links":{"citing_paper":"/paper/1907.03757"},"observation_digest":"sha256:e547fa790fddcf92c781bef4680bb820d6bbca822ae3e5c4732a79db4ecc57ab","observation_id":"2c1a4a36-f087-4ffc-b155-eae0d0bf7ef8","resolution":{"observed_at":"2026-05-25T00:55:09.801986Z","resolver_source":"raw_fallback","status":"verified_fuzzy"},"standing_notice":{"events":[],"observation":"No event found in the named queried sources as of 2026-07-20T06:30:07.809122+00:00.","reason":null,"source_receipts":[{"observed_at":"2026-07-20T06:30:07.809122+00:00","source":"crossref"},{"observed_at":"2026-07-20T06:30:01.33724+00:00","source":"retraction_watch"}],"state":"measured"}},{"citation":{"cited_paper":null,"cited_work":{"arxiv_id":null,"doi":null,"metadata_source":"raw_reference","pith_arxiv_id":null,"snapshot_observed_at":"2026-06-05T21:23:00.469572Z","title":"2016, ApJ, 821, 13","venue":null,"work_id":"9d516a9f-b13b-426b-800a-037abac4b732","year":2016},"citing_paper":{"arxiv_id":"1907.03757","last_updated":"2019-07-08T18:00:00Z","snapshot_observed_at":"2026-07-06T08:05:57.037453Z","submitted_at":"2019-07-08T18:00:00Z","title":"Discovery of a close-separation binary quasar at the heart of a z~0.2 merging galaxy and its implications for low-frequency gravitational waves","version":1},"reference_index":2,"source":"pdf_text","source_observed_at":"2026-05-25T00:54:56.610400Z"},"links":{"citing_paper":"/paper/1907.03757"},"observation_digest":"sha256:d00bb44525f513c2775bcbc4bb0f95ba5c7a304930e4817647f62d33ebf6942c","observation_id":"2cae0736-b12a-46b3-9d0d-c59187188ff4","resolution":{"observed_at":"2026-05-25T00:55:09.780011Z","resolver_source":"raw_fallback","status":"verified_fuzzy"},"standing_notice":{"events":[],"observation":"No event found in the named queried sources as of 2026-07-20T06:30:07.809122+00:00.","reason":null,"source_receipts":[{"observed_at":"2026-07-20T06:30:07.809122+00:00","source":"crossref"},{"observed_at":"2026-07-20T06:30:01.33724+00:00","source":"retraction_watch"}],"state":"measured"}},{"citation":{"cited_paper":null,"cited_work":{"arxiv_id":null,"doi":null,"metadata_source":"raw_reference","pith_arxiv_id":null,"snapshot_observed_at":"2026-06-05T21:23:00.469572Z","title":"T., Brazier, A., et al","venue":null,"work_id":"9492881d-0216-45f7-89f1-64ac9d23b468","year":2018},"citing_paper":{"arxiv_id":"1907.03757","last_updated":"2019-07-08T18:00:00Z","snapshot_observed_at":"2026-07-06T08:05:57.037453Z","submitted_at":"2019-07-08T18:00:00Z","title":"Discovery of a close-separation binary quasar at the heart of a z~0.2 merging galaxy and its implications for low-frequency gravitational waves","version":1},"reference_index":3,"source":"pdf_text","source_observed_at":"2026-05-25T00:54:56.610400Z"},"links":{"citing_paper":"/paper/1907.03757"},"observation_digest":"sha256:258a5c84d25dad43d870c680840b8cdb372cebcae91a0fcecf4899354f28c91a","observation_id":"975dd918-48a7-45d6-b88d-8409a4d97cb5","resolution":{"observed_at":"2026-05-25T00:55:09.874659Z","resolver_source":"raw_fallback","status":"verified_fuzzy"},"standing_notice":{"events":[],"observation":"No event found in the named queried sources as of 2026-07-20T06:30:07.809122+00:00.","reason":null,"source_receipts":[{"observed_at":"2026-07-20T06:30:07.809122+00:00","source":"crossref"},{"observed_at":"2026-07-20T06:30:01.33724+00:00","source":"retraction_watch"}],"state":"measured"}},{"citation":{"cited_paper":null,"cited_work":{"arxiv_id":null,"doi":null,"metadata_source":"raw_reference","pith_arxiv_id":null,"snapshot_observed_at":"2026-07-07T05:13:21.800897Z","title":"C., Blandford, R","venue":null,"work_id":"03b87c11-f865-430c-842a-6ddfb370b01b","year":1980},"citing_paper":{"arxiv_id":"1907.03757","last_updated":"2019-07-08T18:00:00Z","snapshot_observed_at":"2026-07-06T08:05:57.037453Z","submitted_at":"2019-07-08T18:00:00Z","title":"Discovery of a close-separation binary quasar at the heart of a z~0.2 merging galaxy and its implications for low-frequency gravitational waves","version":1},"reference_index":4,"source":"pdf_text","source_observed_at":"2026-05-25T00:54:56.610400Z"},"links":{"citing_paper":"/paper/1907.03757"},"observation_digest":"sha256:85a0b7af527a7d22b5a03c48face9bc825496e170034094f11259cb7a94d4337","observation_id":"cab5906a-780f-44f7-8fa0-de71b76b6d3c","resolution":{"observed_at":"2026-05-25T00:55:09.867451Z","resolver_source":"raw_fallback","status":"verified_fuzzy"},"standing_notice":{"events":[],"observation":"No event found in the named queried sources as of 2026-07-20T06:30:07.809122+00:00.","reason":null,"source_receipts":[{"observed_at":"2026-07-20T06:30:07.809122+00:00","source":"crossref"},{"observed_at":"2026-07-20T06:30:01.33724+00:00","source":"retraction_watch"}],"state":"measured"}},{"citation":{"cited_paper":null,"cited_work":{"arxiv_id":null,"doi":null,"metadata_source":"raw_reference","pith_arxiv_id":null,"snapshot_observed_at":"2026-06-05T21:23:00.469572Z","title":"2008, Galactic Dynamics: Second Edition (Princeton University Press)","venue":null,"work_id":"bdcba2f5-5e39-49d8-95b2-1f2adfc38b9c","year":2008},"citing_paper":{"arxiv_id":"1907.03757","last_updated":"2019-07-08T18:00:00Z","snapshot_observed_at":"2026-07-06T08:05:57.037453Z","submitted_at":"2019-07-08T18:00:00Z","title":"Discovery of a close-separation binary quasar at the heart of a z~0.2 merging galaxy and its implications for low-frequency gravitational waves","version":1},"reference_index":5,"source":"pdf_text","source_observed_at":"2026-05-25T00:54:56.610400Z"},"links":{"citing_paper":"/paper/1907.03757"},"observation_digest":"sha256:23c61fed6d9f46f06b92e08812ffa44667eb435bbc66593a3c595c89173aa0b6","observation_id":"c9dec088-8765-4bb9-85cb-76268a3822a4","resolution":{"observed_at":"2026-05-25T00:55:09.842169Z","resolver_source":"raw_fallback","status":"verified_fuzzy"},"standing_notice":{"events":[],"observation":"No event found in the named queried sources as of 2026-07-20T06:30:07.809122+00:00.","reason":null,"source_receipts":[{"observed_at":"2026-07-20T06:30:07.809122+00:00","source":"crossref"},{"observed_at":"2026-07-20T06:30:01.33724+00:00","source":"retraction_watch"}],"state":"measured"}},{"citation":{"cited_paper":null,"cited_work":{"arxiv_id":null,"doi":null,"metadata_source":"raw_reference","pith_arxiv_id":null,"snapshot_observed_at":"2026-07-07T05:13:21.707830Z","title":"2018, MNRAS, 477","venue":null,"work_id":"a4f579c1-354f-43c2-918d-c579b32fd7d5","year":2018},"citing_paper":{"arxiv_id":"1907.03757","last_updated":"2019-07-08T18:00:00Z","snapshot_observed_at":"2026-07-06T08:05:57.037453Z","submitted_at":"2019-07-08T18:00:00Z","title":"Discovery of a close-separation binary quasar at the heart of a z~0.2 merging galaxy and its implications for low-frequency gravitational waves","version":1},"reference_index":6,"source":"pdf_text","source_observed_at":"2026-05-25T00:54:56.610400Z"},"links":{"citing_paper":"/paper/1907.03757"},"observation_digest":"sha256:cb02735b76a351b299ec5eb9ae2dccbdba16ec019bb9b93b8162f943829313e7","observation_id":"58ad669e-5f21-4b0c-910c-8c781dfaefe5","resolution":{"observed_at":"2026-05-25T00:55:09.811743Z","resolver_source":"raw_fallback","status":"verified_fuzzy"},"standing_notice":{"events":[],"observation":"No event found in the named queried sources as of 2026-07-20T06:30:07.809122+00:00.","reason":null,"source_receipts":[{"observed_at":"2026-07-20T06:30:07.809122+00:00","source":"crossref"},{"observed_at":"2026-07-20T06:30:01.33724+00:00","source":"retraction_watch"}],"state":"measured"}},{"citation":{"cited_paper":{"arxiv_id":"1811.08826","last_updated":"2019-05-17T16:03:55Z","snapshot_observed_at":"2026-07-06T02:11:23.670680Z","submitted_at":"2018-11-15T19:00:01Z","title":"The Astrophysics of Nanohertz Gravitational Waves","version":4},"cited_work":{"arxiv_id":"1811.08826","doi":null,"metadata_source":"pith","pith_arxiv_id":"1811.08826","snapshot_observed_at":"2026-07-04T17:50:00.572183Z","title":"The Astrophysics of Nanohertz Gravitational Waves","venue":"astro-ph.HE","work_id":"1090b63b-0177-4379-8792-9c199bbeb278","year":2018},"citing_paper":{"arxiv_id":"1907.03757","last_updated":"2019-07-08T18:00:00Z","snapshot_observed_at":"2026-07-06T08:05:57.037453Z","submitted_at":"2019-07-08T18:00:00Z","title":"Discovery of a close-separation binary quasar at the heart of a z~0.2 merging galaxy and its implications for low-frequency gravitational waves","version":1},"reference_index":7,"source":"pdf_text","source_observed_at":"2026-05-25T00:54:56.610400Z"},"links":{"cited_paper":"/paper/1811.08826","citing_paper":"/paper/1907.03757"},"observation_digest":"sha256:349b50e2d95b3400220cb32ab672b6e6b25fe0322a5fe763962a2d1bc1318e1c","observation_id":"b08b9650-2373-40d4-aadc-3fa20867c6a7","resolution":{"observed_at":"2026-05-25T00:55:09.456742Z","resolver_source":"local_arxiv","status":"metadata_mismatch"},"standing_notice":{"events":[],"observation":"No event found in the named queried sources as of 2026-07-20T06:30:07.809122+00:00.","reason":null,"source_receipts":[{"observed_at":"2026-07-20T06:30:07.809122+00:00","source":"crossref"},{"observed_at":"2026-07-20T06:30:01.33724+00:00","source":"retraction_watch"}],"state":"measured"}},{"citation":{"cited_paper":null,"cited_work":{"arxiv_id":null,"doi":null,"metadata_source":"raw_reference","pith_arxiv_id":null,"snapshot_observed_at":"2026-06-05T21:23:00.469572Z","title":"J., Hickox, R","venue":null,"work_id":"da796fdf-846a-40b8-8b89-4ac1e609c8f7","year":2017},"citing_paper":{"arxiv_id":"1907.03757","last_updated":"2019-07-08T18:00:00Z","snapshot_observed_at":"2026-07-06T08:05:57.037453Z","submitted_at":"2019-07-08T18:00:00Z","title":"Discovery of a close-separation binary quasar at the heart of a z~0.2 merging galaxy and its implications for low-frequency gravitational waves","version":1},"reference_index":8,"source":"pdf_text","source_observed_at":"2026-05-25T00:54:56.610400Z"},"links":{"citing_paper":"/paper/1907.03757"},"observation_digest":"sha256:1802deef76268192d95034c79adecc2458e574bd1efd7d738dc4d91352f86408","observation_id":"f6857dd9-decd-4a09-8f21-79484d947a79","resolution":{"observed_at":"2026-05-25T00:55:09.892705Z","resolver_source":"raw_fallback","status":"verified_fuzzy"},"standing_notice":{"events":[],"observation":"No event found in the named queried sources as of 2026-07-20T06:30:07.809122+00:00.","reason":null,"source_receipts":[{"observed_at":"2026-07-20T06:30:07.809122+00:00","source":"crossref"},{"observed_at":"2026-07-20T06:30:01.33724+00:00","source":"retraction_watch"}],"state":"measured"}},{"citation":{"cited_paper":null,"cited_work":{"arxiv_id":null,"doi":null,"metadata_source":"raw_reference","pith_arxiv_id":null,"snapshot_observed_at":"2026-06-05T21:23:00.469572Z","title":"1993, MNRAS, 265, 250","venue":null,"work_id":"a626aff2-166f-4b59-9f87-c5a1178d801e","year":1993},"citing_paper":{"arxiv_id":"1907.03757","last_updated":"2019-07-08T18:00:00Z","snapshot_observed_at":"2026-07-06T08:05:57.037453Z","submitted_at":"2019-07-08T18:00:00Z","title":"Discovery of a close-separation binary quasar at the heart of a z~0.2 merging galaxy and its implications for low-frequency gravitational waves","version":1},"reference_index":9,"source":"pdf_text","source_observed_at":"2026-05-25T00:54:56.610400Z"},"links":{"citing_paper":"/paper/1907.03757"},"observation_digest":"sha256:0729f6f375b694e6608f2e7acac590d09249e0d37b45c241a8d5300384d60d97","observation_id":"6c18e5bb-323c-43e9-b877-0828709e7443","resolution":{"observed_at":"2026-05-25T00:55:09.937067Z","resolver_source":"raw_fallback","status":"verified_fuzzy"},"standing_notice":{"events":[],"observation":"No event found in the named queried sources as of 2026-07-20T06:30:07.809122+00:00.","reason":null,"source_receipts":[{"observed_at":"2026-07-20T06:30:07.809122+00:00","source":"crossref"},{"observed_at":"2026-07-20T06:30:01.33724+00:00","source":"retraction_watch"}],"state":"measured"}},{"citation":{"cited_paper":{"arxiv_id":"1905.02689","last_updated":"2019-05-07T16:49:46Z","snapshot_observed_at":"2026-07-06T07:50:58.894081Z","submitted_at":"2019-05-07T16:49:46Z","title":"The Unique Blazar OJ 287 and its Massive Binary Black Hole Central Engine","version":1},"cited_work":{"arxiv_id":"1905.02689","doi":null,"metadata_source":"pith","pith_arxiv_id":"1905.02689","snapshot_observed_at":"2026-06-28T04:41:39.522725Z","title":"The Unique Blazar OJ 287 and its Massive Binary Black Hole Central Engine","venue":"astro-ph.GA","work_id":"95b6f090-fbd7-4641-b1d4-dc5e0ad77d40","year":2019},"citing_paper":{"arxiv_id":"1907.03757","last_updated":"2019-07-08T18:00:00Z","snapshot_observed_at":"2026-07-06T08:05:57.037453Z","submitted_at":"2019-07-08T18:00:00Z","title":"Discovery of a close-separation binary quasar at the heart of a z~0.2 merging galaxy and its implications for low-frequency gravitational waves","version":1},"reference_index":10,"source":"pdf_text","source_observed_at":"2026-05-25T00:54:56.610400Z"},"links":{"cited_paper":"/paper/1905.02689","citing_paper":"/paper/1907.03757"},"observation_digest":"sha256:ceae72734a1d1f717882e6f2851a8fe6cec1796417d745c82a06f223a820db1c","observation_id":"9e9300e3-48db-480c-ae46-277d70055eb5","resolution":{"observed_at":"2026-05-25T00:55:09.469781Z","resolver_source":"local_arxiv","status":"metadata_mismatch"},"standing_notice":{"events":[],"observation":"No event found in the named queried sources as of 2026-07-20T06:30:07.809122+00:00.","reason":null,"source_receipts":[{"observed_at":"2026-07-20T06:30:07.809122+00:00","source":"crossref"},{"observed_at":"2026-07-20T06:30:01.33724+00:00","source":"retraction_watch"}],"state":"measured"}},{"citation":{"cited_paper":null,"cited_work":{"arxiv_id":null,"doi":null,"metadata_source":"raw_reference","pith_arxiv_id":null,"snapshot_observed_at":"2026-06-05T21:23:00.469572Z","title":"2011, Nature, 477, 431","venue":null,"work_id":"3ca66c5e-b9af-4921-a301-cd48c46a8a56","year":2011},"citing_paper":{"arxiv_id":"1907.03757","last_updated":"2019-07-08T18:00:00Z","snapshot_observed_at":"2026-07-06T08:05:57.037453Z","submitted_at":"2019-07-08T18:00:00Z","title":"Discovery of a close-separation binary quasar at the heart of a z~0.2 merging galaxy and its implications for low-frequency gravitational waves","version":1},"reference_index":11,"source":"pdf_text","source_observed_at":"2026-05-25T00:54:56.610400Z"},"links":{"citing_paper":"/paper/1907.03757"},"observation_digest":"sha256:a6a08491586c78d3eec8416c72946ad7dcc45d090fca93a29dafd1081570309c","observation_id":"0ef1df32-f225-40a3-b3e4-5181986811ee","resolution":{"observed_at":"2026-05-25T00:55:09.852486Z","resolver_source":"raw_fallback","status":"verified_fuzzy"},"standing_notice":{"events":[],"observation":"No event found in the named queried sources as of 2026-07-20T06:30:07.809122+00:00.","reason":null,"source_receipts":[{"observed_at":"2026-07-20T06:30:07.809122+00:00","source":"crossref"},{"observed_at":"2026-07-20T06:30:01.33724+00:00","source":"retraction_watch"}],"state":"measured"}},{"citation":{"cited_paper":null,"cited_work":{"arxiv_id":null,"doi":null,"metadata_source":"raw_reference","pith_arxiv_id":null,"snapshot_observed_at":"2026-06-05T21:23:00.469572Z","title":"M., Storchi-Bergmann, T., et al","venue":null,"work_id":"70983762-0511-4117-8ebc-63bb96adae53","year":2018},"citing_paper":{"arxiv_id":"1907.03757","last_updated":"2019-07-08T18:00:00Z","snapshot_observed_at":"2026-07-06T08:05:57.037453Z","submitted_at":"2019-07-08T18:00:00Z","title":"Discovery of a close-separation binary quasar at the heart of a z~0.2 merging galaxy and its implications for low-frequency gravitational waves","version":1},"reference_index":12,"source":"pdf_text","source_observed_at":"2026-05-25T00:54:56.610400Z"},"links":{"citing_paper":"/paper/1907.03757"},"observation_digest":"sha256:dc5e43aa06a5af8af9cca003e6961155e3fc25b00a81cf745425356e676394ce","observation_id":"38a685df-3f07-4a18-ba75-20d21acbf1cb","resolution":{"observed_at":"2026-05-25T00:55:09.933678Z","resolver_source":"raw_fallback","status":"verified_fuzzy"},"standing_notice":{"events":[],"observation":"No event found in the named queried sources as of 2026-07-20T06:30:07.809122+00:00.","reason":null,"source_receipts":[{"observed_at":"2026-07-20T06:30:07.809122+00:00","source":"crossref"},{"observed_at":"2026-07-20T06:30:01.33724+00:00","source":"retraction_watch"}],"state":"measured"}},{"citation":{"cited_paper":null,"cited_work":{"arxiv_id":null,"doi":null,"metadata_source":"raw_reference","pith_arxiv_id":null,"snapshot_observed_at":"2026-06-05T21:23:00.469572Z","title":"D., et al","venue":null,"work_id":"39565095-d85a-432e-b092-7f1a0e843b43","year":2012},"citing_paper":{"arxiv_id":"1907.03757","last_updated":"2019-07-08T18:00:00Z","snapshot_observed_at":"2026-07-06T08:05:57.037453Z","submitted_at":"2019-07-08T18:00:00Z","title":"Discovery of a close-separation binary quasar at the heart of a z~0.2 merging galaxy and its implications for low-frequency gravitational waves","version":1},"reference_index":13,"source":"pdf_text","source_observed_at":"2026-05-25T00:54:56.610400Z"},"links":{"citing_paper":"/paper/1907.03757"},"observation_digest":"sha256:0fa2e58fb08f646a51c30ccab3cbd75ac38924f54757f595299098eb1b4ca8d3","observation_id":"0f919818-1e13-48bc-b185-97c4da2ec329","resolution":{"observed_at":"2026-05-25T00:55:09.924620Z","resolver_source":"raw_fallback","status":"verified_fuzzy"},"standing_notice":{"events":[],"observation":"No event found in the named queried sources as of 2026-07-20T06:30:07.809122+00:00.","reason":null,"source_receipts":[{"observed_at":"2026-07-20T06:30:07.809122+00:00","source":"crossref"},{"observed_at":"2026-07-20T06:30:01.33724+00:00","source":"retraction_watch"}],"state":"measured"}},{"citation":{"cited_paper":null,"cited_work":{"arxiv_id":null,"doi":null,"metadata_source":"raw_reference","pith_arxiv_id":null,"snapshot_observed_at":"2026-06-05T21:23:00.469572Z","title":"2000, ApJ, 532, L29","venue":null,"work_id":"937fab4b-f163-4ff3-97c3-2956fa7e5ecb","year":2000},"citing_paper":{"arxiv_id":"1907.03757","last_updated":"2019-07-08T18:00:00Z","snapshot_observed_at":"2026-07-06T08:05:57.037453Z","submitted_at":"2019-07-08T18:00:00Z","title":"Discovery of a close-separation binary quasar at the heart of a z~0.2 merging galaxy and its implications for low-frequency gravitational waves","version":1},"reference_index":14,"source":"pdf_text","source_observed_at":"2026-05-25T00:54:56.610400Z"},"links":{"citing_paper":"/paper/1907.03757"},"observation_digest":"sha256:0833c4981ca5f7602a4483c6a11a37e6fd61dce35e4c788c946ac97503fbde93","observation_id":"b002dd4c-861d-4d70-9c34-92b7207d01a5","resolution":{"observed_at":"2026-05-25T00:55:09.782507Z","resolver_source":"raw_fallback","status":"verified_fuzzy"},"standing_notice":{"events":[],"observation":"No event found in the named queried sources as of 2026-07-20T06:30:07.809122+00:00.","reason":null,"source_receipts":[{"observed_at":"2026-07-20T06:30:07.809122+00:00","source":"crossref"},{"observed_at":"2026-07-20T06:30:01.33724+00:00","source":"retraction_watch"}],"state":"measured"}},{"citation":{"cited_paper":null,"cited_work":{"arxiv_id":null,"doi":null,"metadata_source":"raw_reference","pith_arxiv_id":null,"snapshot_observed_at":"2026-06-05T21:23:00.469572Z","title":"D., Alexander, D","venue":null,"work_id":"df40693a-e813-47c2-bf51-a62084c3388d","year":2011},"citing_paper":{"arxiv_id":"1907.03757","last_updated":"2019-07-08T18:00:00Z","snapshot_observed_at":"2026-07-06T08:05:57.037453Z","submitted_at":"2019-07-08T18:00:00Z","title":"Discovery of a close-separation binary quasar at the heart of a z~0.2 merging galaxy and its implications for low-frequency gravitational waves","version":1},"reference_index":15,"source":"pdf_text","source_observed_at":"2026-05-25T00:54:56.610400Z"},"links":{"citing_paper":"/paper/1907.03757"},"observation_digest":"sha256:8d1b08ef85adcbd4b6dc219f91b0e3fbe65c3feb51a3b41e572f175086893f45","observation_id":"4395ac18-f92b-4ced-976b-e03d8d611fd5","resolution":{"observed_at":"2026-05-25T00:55:09.940666Z","resolver_source":"raw_fallback","status":"verified_fuzzy"},"standing_notice":{"events":[],"observation":"No event found in the named queried sources as of 2026-07-20T06:30:07.809122+00:00.","reason":null,"source_receipts":[{"observed_at":"2026-07-20T06:30:07.809122+00:00","source":"crossref"},{"observed_at":"2026-07-20T06:30:01.33724+00:00","source":"retraction_watch"}],"state":"measured"}},{"citation":{"cited_paper":null,"cited_work":{"arxiv_id":null,"doi":null,"metadata_source":"raw_reference","pith_arxiv_id":null,"snapshot_observed_at":"2026-06-05T21:23:00.469572Z","title":"A., Kocevski, D","venue":null,"work_id":"310dc820-999d-4ef3-bba5-86d4fe42d09d","year":2011},"citing_paper":{"arxiv_id":"1907.03757","last_updated":"2019-07-08T18:00:00Z","snapshot_observed_at":"2026-07-06T08:05:57.037453Z","submitted_at":"2019-07-08T18:00:00Z","title":"Discovery of a close-separation binary quasar at the heart of a z~0.2 merging galaxy and its implications for low-frequency gravitational waves","version":1},"reference_index":16,"source":"pdf_text","source_observed_at":"2026-05-25T00:54:56.610400Z"},"links":{"citing_paper":"/paper/1907.03757"},"observation_digest":"sha256:219579ffae7d6d1160faffa99587cd93228779ac4460b2e40ef920e01587e271","observation_id":"6e77e76d-dc23-40a2-9d28-7f44fc9a476b","resolution":{"observed_at":"2026-05-25T00:55:09.785507Z","resolver_source":"raw_fallback","status":"verified_fuzzy"},"standing_notice":{"events":[],"observation":"No event found in the named queried sources as of 2026-07-20T06:30:07.809122+00:00.","reason":null,"source_receipts":[{"observed_at":"2026-07-20T06:30:07.809122+00:00","source":"crossref"},{"observed_at":"2026-07-20T06:30:01.33724+00:00","source":"retraction_watch"}],"state":"measured"}},{"citation":{"cited_paper":null,"cited_work":{"arxiv_id":null,"doi":null,"metadata_source":"raw_reference","pith_arxiv_id":null,"snapshot_observed_at":"2026-06-05T21:23:00.469572Z","title":"M., Alexander, D","venue":null,"work_id":"16a64efb-287b-4815-befe-2afe1e414d48","year":2014},"citing_paper":{"arxiv_id":"1907.03757","last_updated":"2019-07-08T18:00:00Z","snapshot_observed_at":"2026-07-06T08:05:57.037453Z","submitted_at":"2019-07-08T18:00:00Z","title":"Discovery of a close-separation binary quasar at the heart of a z~0.2 merging galaxy and its implications for low-frequency gravitational waves","version":1},"reference_index":17,"source":"pdf_text","source_observed_at":"2026-05-25T00:54:56.610400Z"},"links":{"citing_paper":"/paper/1907.03757"},"observation_digest":"sha256:5e66624d52734bd317deb909ad72a9c5e67154ce58783c19993390ab304cca0e","observation_id":"d9342ca5-98c1-431c-8ac4-562a1d390a19","resolution":{"observed_at":"2026-05-25T00:55:09.814610Z","resolver_source":"raw_fallback","status":"verified_fuzzy"},"standing_notice":{"events":[],"observation":"No event found in the named queried sources as of 2026-07-20T06:30:07.809122+00:00.","reason":null,"source_receipts":[{"observed_at":"2026-07-20T06:30:07.809122+00:00","source":"crossref"},{"observed_at":"2026-07-20T06:30:01.33724+00:00","source":"retraction_watch"}],"state":"measured"}},{"citation":{"cited_paper":null,"cited_work":{"arxiv_id":null,"doi":null,"metadata_source":"raw_reference","pith_arxiv_id":null,"snapshot_observed_at":"2026-07-06T22:42:59.211267Z","title":"C., Mullaney, J","venue":null,"work_id":"7e64db8d-9104-4b95-98ac-ea9cdde03123","year":2014},"citing_paper":{"arxiv_id":"1907.03757","last_updated":"2019-07-08T18:00:00Z","snapshot_observed_at":"2026-07-06T08:05:57.037453Z","submitted_at":"2019-07-08T18:00:00Z","title":"Discovery of a close-separation binary quasar at the heart of a z~0.2 merging galaxy and its implications for low-frequency gravitational waves","version":1},"reference_index":18,"source":"pdf_text","source_observed_at":"2026-05-25T00:54:56.610400Z"},"links":{"citing_paper":"/paper/1907.03757"},"observation_digest":"sha256:211122714075a76121c66ce389bf54797c9cbcb15f8320f70763d89114cb09c8","observation_id":"a0ccfd66-7912-46fd-9d78-91bdec92ccfa","resolution":{"observed_at":"2026-05-25T00:55:09.907088Z","resolver_source":"raw_fallback","status":"verified_fuzzy"},"standing_notice":{"events":[],"observation":"No event found in the named queried sources as of 2026-07-20T06:30:07.809122+00:00.","reason":null,"source_receipts":[{"observed_at":"2026-07-20T06:30:07.809122+00:00","source":"crossref"},{"observed_at":"2026-07-20T06:30:01.33724+00:00","source":"retraction_watch"}],"state":"measured"}},{"citation":{"cited_paper":null,"cited_work":{"arxiv_id":null,"doi":null,"metadata_source":"raw_reference","pith_arxiv_id":null,"snapshot_observed_at":"2026-06-05T21:23:00.469572Z","title":"F., Richards, G","venue":null,"work_id":"541aba8a-c6d2-42bb-840f-7a3b98f925b4","year":2007},"citing_paper":{"arxiv_id":"1907.03757","last_updated":"2019-07-08T18:00:00Z","snapshot_observed_at":"2026-07-06T08:05:57.037453Z","submitted_at":"2019-07-08T18:00:00Z","title":"Discovery of a close-separation binary quasar at the heart of a z~0.2 merging galaxy and its implications for low-frequency gravitational waves","version":1},"reference_index":19,"source":"pdf_text","source_observed_at":"2026-05-25T00:54:56.610400Z"},"links":{"citing_paper":"/paper/1907.03757"},"observation_digest":"sha256:1e83737db3babfc9bbdb3d0359e16b437ed61e8b007603879a9051aac029ef60","observation_id":"66402e02-8fa6-4221-9e2b-5597f0cf5d87","resolution":{"observed_at":"2026-05-25T00:55:09.896504Z","resolver_source":"raw_fallback","status":"verified_fuzzy"},"standing_notice":{"events":[],"observation":"No event found in the named queried sources as of 2026-07-20T06:30:07.809122+00:00.","reason":null,"source_receipts":[{"observed_at":"2026-07-20T06:30:07.809122+00:00","source":"crossref"},{"observed_at":"2026-07-20T06:30:01.33724+00:00","source":"retraction_watch"}],"state":"measured"}},{"citation":{"cited_paper":null,"cited_work":{"arxiv_id":null,"doi":null,"metadata_source":"raw_reference","pith_arxiv_id":null,"snapshot_observed_at":"2026-06-05T21:23:00.469572Z","title":null,"venue":null,"work_id":"fd8f38bb-7116-4a9e-8b02-38f13e9f01d1","year":2009},"citing_paper":{"arxiv_id":"1907.03757","last_updated":"2019-07-08T18:00:00Z","snapshot_observed_at":"2026-07-06T08:05:57.037453Z","submitted_at":"2019-07-08T18:00:00Z","title":"Discovery of a close-separation binary quasar at the heart of a z~0.2 merging galaxy and its implications for low-frequency gravitational waves","version":1},"reference_index":20,"source":"pdf_text","source_observed_at":"2026-05-25T00:54:56.610400Z"},"links":{"citing_paper":"/paper/1907.03757"},"observation_digest":"sha256:c32de18fb99ba6de9b912f6bb89e37b74979563872b2c187275d4f153e712d57","observation_id":"29ba53f2-9d60-4897-9e40-9f47aa036c53","resolution":{"observed_at":"2026-05-25T00:55:09.920633Z","resolver_source":"raw_fallback","status":"unresolved"},"standing_notice":{"events":[],"observation":"No event found in the named queried sources as of 2026-07-20T06:30:07.809122+00:00.","reason":null,"source_receipts":[{"observed_at":"2026-07-20T06:30:07.809122+00:00","source":"crossref"},{"observed_at":"2026-07-20T06:30:01.33724+00:00","source":"retraction_watch"}],"state":"measured"}},{"citation":{"cited_paper":null,"cited_work":{"arxiv_id":null,"doi":null,"metadata_source":"raw_reference","pith_arxiv_id":null,"snapshot_observed_at":"2026-06-05T21:23:00.469572Z","title":"Z., Blecha, L., Hernquist, L., Sesana, A., & Taylor, S","venue":null,"work_id":"8968ba13-1ce0-44d3-a025-a8ee32388322","year":2017},"citing_paper":{"arxiv_id":"1907.03757","last_updated":"2019-07-08T18:00:00Z","snapshot_observed_at":"2026-07-06T08:05:57.037453Z","submitted_at":"2019-07-08T18:00:00Z","title":"Discovery of a close-separation binary quasar at the heart of a z~0.2 merging galaxy and its implications for low-frequency gravitational waves","version":1},"reference_index":21,"source":"pdf_text","source_observed_at":"2026-05-25T00:54:56.610400Z"},"links":{"citing_paper":"/paper/1907.03757"},"observation_digest":"sha256:349a79bfaf61de104be48df68e6f018d024119e95b7ff3f624605e6feac475b5","observation_id":"2c8b3ced-9e26-4f61-9267-4e4c37a1cc4f","resolution":{"observed_at":"2026-05-25T00:55:09.856477Z","resolver_source":"raw_fallback","status":"verified_fuzzy"},"standing_notice":{"events":[],"observation":"No event found in the named queried sources as of 2026-07-20T06:30:07.809122+00:00.","reason":null,"source_receipts":[{"observed_at":"2026-07-20T06:30:07.809122+00:00","source":"crossref"},{"observed_at":"2026-07-20T06:30:01.33724+00:00","source":"retraction_watch"}],"state":"measured"}},{"citation":{"cited_paper":null,"cited_work":{"arxiv_id":null,"doi":null,"metadata_source":"raw_reference","pith_arxiv_id":null,"snapshot_observed_at":"2026-06-05T21:23:00.469572Z","title":"J., Blecha, L., Bernhard, P., et al","venue":null,"work_id":"d23e46e0-38b8-4b97-b09f-7fa5adcaf9a7","year":2018},"citing_paper":{"arxiv_id":"1907.03757","last_updated":"2019-07-08T18:00:00Z","snapshot_observed_at":"2026-07-06T08:05:57.037453Z","submitted_at":"2019-07-08T18:00:00Z","title":"Discovery of a close-separation binary quasar at the heart of a z~0.2 merging galaxy and its implications for low-frequency gravitational waves","version":1},"reference_index":22,"source":"pdf_text","source_observed_at":"2026-05-25T00:54:56.610400Z"},"links":{"citing_paper":"/paper/1907.03757"},"observation_digest":"sha256:1eb31d44afaaf1069196c4b5b70a33bd5cd9cf65a74d18383fd411056c390031","observation_id":"fcbb452e-9cac-429a-b0f4-9d4c32e2707d","resolution":{"observed_at":"2026-05-25T00:55:09.889230Z","resolver_source":"raw_fallback","status":"verified_fuzzy"},"standing_notice":{"events":[],"observation":"No event found in the named queried sources as of 2026-07-20T06:30:07.809122+00:00.","reason":null,"source_receipts":[{"observed_at":"2026-07-20T06:30:07.809122+00:00","source":"crossref"},{"observed_at":"2026-07-20T06:30:01.33724+00:00","source":"retraction_watch"}],"state":"measured"}},{"citation":{"cited_paper":null,"cited_work":{"arxiv_id":null,"doi":null,"metadata_source":"raw_reference","pith_arxiv_id":null,"snapshot_observed_at":"2026-06-05T21:23:00.469572Z","title":"D., Alexander, D","venue":null,"work_id":"c9530632-e505-4807-9fc8-e5b2bf839bcc","year":2010},"citing_paper":{"arxiv_id":"1907.03757","last_updated":"2019-07-08T18:00:00Z","snapshot_observed_at":"2026-07-06T08:05:57.037453Z","submitted_at":"2019-07-08T18:00:00Z","title":"Discovery of a close-separation binary quasar at the heart of a z~0.2 merging galaxy and its implications for low-frequency gravitational waves","version":1},"reference_index":23,"source":"pdf_text","source_observed_at":"2026-05-25T00:54:56.610400Z"},"links":{"citing_paper":"/paper/1907.03757"},"observation_digest":"sha256:11732270e476f0affbc76b4614e77b797f7cec25da22830b04b076d452378542","observation_id":"82c328fa-aba8-4ff6-841b-a0a09d17f1ce","resolution":{"observed_at":"2026-05-25T00:55:09.827658Z","resolver_source":"raw_fallback","status":"verified_fuzzy"},"standing_notice":{"events":[],"observation":"No event found in the named queried sources as of 2026-07-20T06:30:07.809122+00:00.","reason":null,"source_receipts":[{"observed_at":"2026-07-20T06:30:07.809122+00:00","source":"crossref"},{"observed_at":"2026-07-20T06:30:01.33724+00:00","source":"retraction_watch"}],"state":"measured"}},{"citation":{"cited_paper":null,"cited_work":{"arxiv_id":null,"doi":null,"metadata_source":"raw_reference","pith_arxiv_id":null,"snapshot_observed_at":"2026-06-05T21:23:00.469572Z","title":"2013, ApJ, 762, 110","venue":null,"work_id":"5b581559-21a5-43c0-80c4-58268ee7244c","year":2013},"citing_paper":{"arxiv_id":"1907.03757","last_updated":"2019-07-08T18:00:00Z","snapshot_observed_at":"2026-07-06T08:05:57.037453Z","submitted_at":"2019-07-08T18:00:00Z","title":"Discovery of a close-separation binary quasar at the heart of a z~0.2 merging galaxy and its implications for low-frequency gravitational waves","version":1},"reference_index":24,"source":"pdf_text","source_observed_at":"2026-05-25T00:54:56.610400Z"},"links":{"citing_paper":"/paper/1907.03757"},"observation_digest":"sha256:927160a76f684c7168c9596412d8f350f389883a15a8123dd397c59933d01838","observation_id":"6945c617-3218-4783-b9ef-a8c550a566a9","resolution":{"observed_at":"2026-05-25T00:55:09.849047Z","resolver_source":"raw_fallback","status":"verified_fuzzy"},"standing_notice":{"events":[],"observation":"No event found in the named queried sources as of 2026-07-20T06:30:07.809122+00:00.","reason":null,"source_receipts":[{"observed_at":"2026-07-20T06:30:07.809122+00:00","source":"crossref"},{"observed_at":"2026-07-20T06:30:01.33724+00:00","source":"retraction_watch"}],"state":"measured"}},{"citation":{"cited_paper":null,"cited_work":{"arxiv_id":null,"doi":null,"metadata_source":"raw_reference","pith_arxiv_id":null,"snapshot_observed_at":"2026-06-05T21:23:00.469572Z","title":"E., Shen, Y ., & Strauss, M","venue":null,"work_id":"fc739c36-6a76-4ac2-ad21-1527986fd6d4","year":2010},"citing_paper":{"arxiv_id":"1907.03757","last_updated":"2019-07-08T18:00:00Z","snapshot_observed_at":"2026-07-06T08:05:57.037453Z","submitted_at":"2019-07-08T18:00:00Z","title":"Discovery of a close-separation binary quasar at the heart of a z~0.2 merging galaxy and its implications for low-frequency gravitational waves","version":1},"reference_index":25,"source":"pdf_text","source_observed_at":"2026-05-25T00:54:56.610400Z"},"links":{"citing_paper":"/paper/1907.03757"},"observation_digest":"sha256:16baeb8e567115381c0f3366ed410aed04f6d2363f9f13f9ac6cbfe384f0a0bb","observation_id":"f27fddb1-de3d-4cf5-b8a7-06f361eb08d3","resolution":{"observed_at":"2026-05-25T00:55:09.899657Z","resolver_source":"raw_fallback","status":"verified_fuzzy"},"standing_notice":{"events":[],"observation":"No event found in the named queried sources as of 2026-07-20T06:30:07.809122+00:00.","reason":null,"source_receipts":[{"observed_at":"2026-07-20T06:30:07.809122+00:00","source":"crossref"},{"observed_at":"2026-07-20T06:30:01.33724+00:00","source":"retraction_watch"}],"state":"measured"}},{"citation":{"cited_paper":null,"cited_work":{"arxiv_id":null,"doi":null,"metadata_source":"raw_reference","pith_arxiv_id":null,"snapshot_observed_at":"2026-06-05T21:23:00.469572Z","title":"2004, MNRAS, 351, 169","venue":null,"work_id":"5ddbc4b9-01a1-443f-bd8d-569224d61db7","year":2004},"citing_paper":{"arxiv_id":"1907.03757","last_updated":"2019-07-08T18:00:00Z","snapshot_observed_at":"2026-07-06T08:05:57.037453Z","submitted_at":"2019-07-08T18:00:00Z","title":"Discovery of a close-separation binary quasar at the heart of a z~0.2 merging galaxy and its implications for low-frequency gravitational waves","version":1},"reference_index":26,"source":"pdf_text","source_observed_at":"2026-05-25T00:54:56.610400Z"},"links":{"citing_paper":"/paper/1907.03757"},"observation_digest":"sha256:91178d1f26d08bd9b03cb970251d0115b566c3b9caee875b4dbdc97d46390aa3","observation_id":"7aef0046-15ac-43d0-a8b8-c64342adf2ea","resolution":{"observed_at":"2026-05-25T00:55:09.808631Z","resolver_source":"raw_fallback","status":"verified_fuzzy"},"standing_notice":{"events":[],"observation":"No event found in the named queried sources as of 2026-07-20T06:30:07.809122+00:00.","reason":null,"source_receipts":[{"observed_at":"2026-07-20T06:30:07.809122+00:00","source":"crossref"},{"observed_at":"2026-07-20T06:30:01.33724+00:00","source":"retraction_watch"}],"state":"measured"}},{"citation":{"cited_paper":null,"cited_work":{"arxiv_id":null,"doi":null,"metadata_source":"raw_reference","pith_arxiv_id":null,"snapshot_observed_at":"2026-06-05T21:23:00.469572Z","title":"2008, MNRAS, 388","venue":null,"work_id":"df6e6418-af85-4cbb-99f3-314d98b5c5d0","year":2008},"citing_paper":{"arxiv_id":"1907.03757","last_updated":"2019-07-08T18:00:00Z","snapshot_observed_at":"2026-07-06T08:05:57.037453Z","submitted_at":"2019-07-08T18:00:00Z","title":"Discovery of a close-separation binary quasar at the heart of a z~0.2 merging galaxy and its implications for low-frequency gravitational waves","version":1},"reference_index":27,"source":"pdf_text","source_observed_at":"2026-05-25T00:54:56.610400Z"},"links":{"citing_paper":"/paper/1907.03757"},"observation_digest":"sha256:15a26a62264057281d62c86d3c7c2d98a36709f81178babb7b2e2fe8a8b606fb","observation_id":"83fdd6e2-7bdb-438b-9f27-8dca2e6fe957","resolution":{"observed_at":"2026-05-25T00:55:09.881691Z","resolver_source":"raw_fallback","status":"verified_fuzzy"},"standing_notice":{"events":[],"observation":"No event found in the named queried sources as of 2026-07-20T06:30:07.809122+00:00.","reason":null,"source_receipts":[{"observed_at":"2026-07-20T06:30:07.809122+00:00","source":"crossref"},{"observed_at":"2026-07-20T06:30:01.33724+00:00","source":"retraction_watch"}],"state":"measured"}},{"citation":{"cited_paper":null,"cited_work":{"arxiv_id":null,"doi":null,"metadata_source":"raw_reference","pith_arxiv_id":null,"snapshot_observed_at":"2026-06-05T21:23:00.469572Z","title":null,"venue":null,"work_id":"bdc84121-5a00-43b3-b1da-855ecdf5e2b3","year":2019},"citing_paper":{"arxiv_id":"1907.03757","last_updated":"2019-07-08T18:00:00Z","snapshot_observed_at":"2026-07-06T08:05:57.037453Z","submitted_at":"2019-07-08T18:00:00Z","title":"Discovery of a close-separation binary quasar at the heart of a z~0.2 merging galaxy and its implications for low-frequency gravitational waves","version":1},"reference_index":28,"source":"pdf_text","source_observed_at":"2026-05-25T00:54:56.610400Z"},"links":{"citing_paper":"/paper/1907.03757"},"observation_digest":"sha256:81e3f7ace774d5ee90378c89a9b02bc3567a83fd63e22480955c29e519cb3e9a","observation_id":"200c30dd-f69d-4e48-8cf9-728663defbaa","resolution":{"observed_at":"2026-05-25T00:55:09.788497Z","resolver_source":"raw_fallback","status":"unresolved"},"standing_notice":{"events":[],"observation":"No event found in the named queried sources as of 2026-07-20T06:30:07.809122+00:00.","reason":null,"source_receipts":[{"observed_at":"2026-07-20T06:30:07.809122+00:00","source":"crossref"},{"observed_at":"2026-07-20T06:30:01.33724+00:00","source":"retraction_watch"}],"state":"measured"}},{"citation":{"cited_paper":null,"cited_work":{"arxiv_id":null,"doi":null,"metadata_source":"raw_reference","pith_arxiv_id":null,"snapshot_observed_at":"2026-06-05T21:23:00.469572Z","title":null,"venue":null,"work_id":"9dff160f-a23d-473f-8b2a-c49f6e47bf9e","year":2017},"citing_paper":{"arxiv_id":"1907.03757","last_updated":"2019-07-08T18:00:00Z","snapshot_observed_at":"2026-07-06T08:05:57.037453Z","submitted_at":"2019-07-08T18:00:00Z","title":"Discovery of a close-separation binary quasar at the heart of a z~0.2 merging galaxy and its implications for low-frequency gravitational waves","version":1},"reference_index":29,"source":"pdf_text","source_observed_at":"2026-05-25T00:54:56.610400Z"},"links":{"citing_paper":"/paper/1907.03757"},"observation_digest":"sha256:e2f32f312bedbb2e6ebde71f02265574310abe2fcafa9cce5c9307166126b6b8","observation_id":"14c79578-7e05-4e4b-8c7c-ff74c7a49783","resolution":{"observed_at":"2026-05-25T00:55:09.831202Z","resolver_source":"raw_fallback","status":"unresolved"},"standing_notice":{"events":[],"observation":"No event found in the named queried sources as of 2026-07-20T06:30:07.809122+00:00.","reason":null,"source_receipts":[{"observed_at":"2026-07-20T06:30:07.809122+00:00","source":"crossref"},{"observed_at":"2026-07-20T06:30:01.33724+00:00","source":"retraction_watch"}],"state":"measured"}},{"citation":{"cited_paper":null,"cited_work":{"arxiv_id":null,"doi":null,"metadata_source":"raw_reference","pith_arxiv_id":null,"snapshot_observed_at":"2026-06-05T21:23:00.469572Z","title":"R., Alexander, D","venue":null,"work_id":"b934855d-c9b6-41cf-9b7d-79410763094a","year":2013},"citing_paper":{"arxiv_id":"1907.03757","last_updated":"2019-07-08T18:00:00Z","snapshot_observed_at":"2026-07-06T08:05:57.037453Z","submitted_at":"2019-07-08T18:00:00Z","title":"Discovery of a close-separation binary quasar at the heart of a z~0.2 merging galaxy and its implications for low-frequency gravitational waves","version":1},"reference_index":30,"source":"pdf_text","source_observed_at":"2026-05-25T00:54:56.610400Z"},"links":{"citing_paper":"/paper/1907.03757"},"observation_digest":"sha256:02445827fecc88233c7c0f266961ef5751c8b5780188192ac25c9e68c9bbeb14","observation_id":"2ab930e2-a5f0-4357-b86b-7ca4d65f2386","resolution":{"observed_at":"2026-05-25T00:55:09.927724Z","resolver_source":"raw_fallback","status":"verified_fuzzy"},"standing_notice":{"events":[],"observation":"No event found in the named queried sources as of 2026-07-20T06:30:07.809122+00:00.","reason":null,"source_receipts":[{"observed_at":"2026-07-20T06:30:07.809122+00:00","source":"crossref"},{"observed_at":"2026-07-20T06:30:01.33724+00:00","source":"retraction_watch"}],"state":"measured"}},{"citation":{"cited_paper":null,"cited_work":{"arxiv_id":null,"doi":null,"metadata_source":"raw_reference","pith_arxiv_id":null,"snapshot_observed_at":"2026-06-05T21:23:00.469572Z","title":"Y ., Ho, L","venue":null,"work_id":"9ade7a13-fa6f-4996-8a3a-c8df08d0446f","year":2010},"citing_paper":{"arxiv_id":"1907.03757","last_updated":"2019-07-08T18:00:00Z","snapshot_observed_at":"2026-07-06T08:05:57.037453Z","submitted_at":"2019-07-08T18:00:00Z","title":"Discovery of a close-separation binary quasar at the heart of a z~0.2 merging galaxy and its implications for low-frequency gravitational waves","version":1},"reference_index":31,"source":"pdf_text","source_observed_at":"2026-05-25T00:54:56.610400Z"},"links":{"citing_paper":"/paper/1907.03757"},"observation_digest":"sha256:e2074b422120a079230dd83e50e28a5bbb53ea6d566c5e7eacc0fee310bb8719","observation_id":"b78249b7-5358-490c-9be9-581ea99adcd3","resolution":{"observed_at":"2026-05-25T00:55:09.903558Z","resolver_source":"raw_fallback","status":"verified_fuzzy"},"standing_notice":{"events":[],"observation":"No event found in the named queried sources as of 2026-07-20T06:30:07.809122+00:00.","reason":null,"source_receipts":[{"observed_at":"2026-07-20T06:30:07.809122+00:00","source":"crossref"},{"observed_at":"2026-07-20T06:30:01.33724+00:00","source":"retraction_watch"}],"state":"measured"}},{"citation":{"cited_paper":{"arxiv_id":"astro-ph/0108028","last_updated":"2001-08-02T00:24:40Z","snapshot_observed_at":"2026-07-06T02:11:23.670680Z","submitted_at":"2001-08-02T00:24:40Z","title":"A Practical Theorem on Gravitational Wave Backgrounds","version":1},"cited_work":{"arxiv_id":"astro-ph/0108028","doi":"10.48550/arxiv.astro-ph/0108028","metadata_source":"pith","pith_arxiv_id":"astro-ph/0108028","snapshot_observed_at":"2026-07-10T12:15:01.137692Z","title":"A Practical Theorem on Gravitational Wave Backgrounds","venue":"astro-ph","work_id":"db82e604-7d41-4806-994f-6620fd0543f3","year":2001},"citing_paper":{"arxiv_id":"1907.03757","last_updated":"2019-07-08T18:00:00Z","snapshot_observed_at":"2026-07-06T08:05:57.037453Z","submitted_at":"2019-07-08T18:00:00Z","title":"Discovery of a close-separation binary quasar at the heart of a z~0.2 merging galaxy and its implications for low-frequency gravitational waves","version":1},"reference_index":32,"source":"pdf_text","source_observed_at":"2026-05-25T00:54:56.610400Z"},"links":{"cited_paper":"/paper/astro-ph/0108028","citing_paper":"/paper/1907.03757"},"observation_digest":"sha256:40fa21e4baf7244b6d27474c64a38bfa733d010620abfd3468baa8191dfaa588","observation_id":"9c9d9ebf-b916-4125-9c62-06cda86f2411","resolution":{"observed_at":"2026-05-25T00:55:09.463218Z","resolver_source":"local_arxiv","status":"verified_exact"},"standing_notice":{"events":[],"observation":"No event found in the named queried sources as of 2026-07-20T06:30:07.809122+00:00.","reason":null,"source_receipts":[{"observed_at":"2026-07-20T06:30:07.809122+00:00","source":"crossref"},{"observed_at":"2026-07-13T22:22:07.921557+00:00","source":"crossref_status_cache"},{"observed_at":"2026-07-13T22:22:07.921557+00:00","source":"openalex_status_cache"},{"observed_at":"2026-07-20T06:30:01.33724+00:00","source":"retraction_watch"}],"state":"measured"}},{"citation":{"cited_paper":null,"cited_work":{"arxiv_id":null,"doi":null,"metadata_source":"raw_reference","pith_arxiv_id":null,"snapshot_observed_at":"2026-06-05T21:23:00.469572Z","title":null,"venue":null,"work_id":"1c5a43b5-0f77-4954-abf4-dbc3a7392956","year":1996},"citing_paper":{"arxiv_id":"1907.03757","last_updated":"2019-07-08T18:00:00Z","snapshot_observed_at":"2026-07-06T08:05:57.037453Z","submitted_at":"2019-07-08T18:00:00Z","title":"Discovery of a close-separation binary quasar at the heart of a z~0.2 merging galaxy and its implications for low-frequency gravitational waves","version":1},"reference_index":33,"source":"pdf_text","source_observed_at":"2026-05-25T00:54:56.610400Z"},"links":{"citing_paper":"/paper/1907.03757"},"observation_digest":"sha256:14c8ccee87674a5a7f2cd07cd545566317cbebd3b1cc2fad663c1cdd38992f69","observation_id":"5147ebc9-3172-40e3-b6a8-d44e1a39468e","resolution":{"observed_at":"2026-05-25T00:55:09.805086Z","resolver_source":"raw_fallback","status":"unresolved"},"standing_notice":{"events":[],"observation":"No event found in the named queried sources as of 2026-07-20T06:30:07.809122+00:00.","reason":null,"source_receipts":[{"observed_at":"2026-07-20T06:30:07.809122+00:00","source":"crossref"},{"observed_at":"2026-07-20T06:30:01.33724+00:00","source":"retraction_watch"}],"state":"measured"}},{"citation":{"cited_paper":null,"cited_work":{"arxiv_id":null,"doi":null,"metadata_source":"raw_reference","pith_arxiv_id":null,"snapshot_observed_at":"2026-07-07T05:13:20.860432Z","title":"B., Zavala, R","venue":null,"work_id":"56ceea66-0266-446e-9afa-e94b3e8081ac","year":2006},"citing_paper":{"arxiv_id":"1907.03757","last_updated":"2019-07-08T18:00:00Z","snapshot_observed_at":"2026-07-06T08:05:57.037453Z","submitted_at":"2019-07-08T18:00:00Z","title":"Discovery of a close-separation binary quasar at the heart of a z~0.2 merging galaxy and its implications for low-frequency gravitational waves","version":1},"reference_index":34,"source":"pdf_text","source_observed_at":"2026-05-25T00:54:56.610400Z"},"links":{"citing_paper":"/paper/1907.03757"},"observation_digest":"sha256:2c6f4b3fdf3b3529413a2941f581eb55482db7231ee2835b8f1dd34045c396f4","observation_id":"bb4797b4-84d8-4ac6-99ba-8bf473cd9638","resolution":{"observed_at":"2026-05-25T00:55:09.885207Z","resolver_source":"raw_fallback","status":"verified_fuzzy"},"standing_notice":{"events":[],"observation":"No event found in the named queried sources as of 2026-07-20T06:30:07.809122+00:00.","reason":null,"source_receipts":[{"observed_at":"2026-07-20T06:30:07.809122+00:00","source":"crossref"},{"observed_at":"2026-07-20T06:30:01.33724+00:00","source":"retraction_watch"}],"state":"measured"}},{"citation":{"cited_paper":null,"cited_work":{"arxiv_id":null,"doi":null,"metadata_source":"raw_reference","pith_arxiv_id":null,"snapshot_observed_at":"2026-06-05T21:23:00.469572Z","title":"P., & Stone, N","venue":null,"work_id":"2f75a2f5-8951-423a-9b38-336a5dd096c9","year":2018},"citing_paper":{"arxiv_id":"1907.03757","last_updated":"2019-07-08T18:00:00Z","snapshot_observed_at":"2026-07-06T08:05:57.037453Z","submitted_at":"2019-07-08T18:00:00Z","title":"Discovery of a close-separation binary quasar at the heart of a z~0.2 merging galaxy and its implications for low-frequency gravitational waves","version":1},"reference_index":35,"source":"pdf_text","source_observed_at":"2026-05-25T00:54:56.610400Z"},"links":{"citing_paper":"/paper/1907.03757"},"observation_digest":"sha256:3d4d6a00ff9f2ecac754cc4569a0809543b593e366bc3705d063f44942213d6f","observation_id":"d0fc2150-44f7-4a08-8f61-de4e39b40d35","resolution":{"observed_at":"2026-05-25T00:55:09.795026Z","resolver_source":"raw_fallback","status":"verified_fuzzy"},"standing_notice":{"events":[],"observation":"No event found in the named queried sources as of 2026-07-20T06:30:07.809122+00:00.","reason":null,"source_receipts":[{"observed_at":"2026-07-20T06:30:07.809122+00:00","source":"crossref"},{"observed_at":"2026-07-20T06:30:01.33724+00:00","source":"retraction_watch"}],"state":"measured"}},{"citation":{"cited_paper":null,"cited_work":{"arxiv_id":null,"doi":null,"metadata_source":"raw_reference","pith_arxiv_id":null,"snapshot_observed_at":"2026-06-05T21:23:00.469572Z","title":"J., & McWilliams, S","venue":null,"work_id":"9dd44c03-d314-4f5a-b1f6-ec6101ef797d","year":2015},"citing_paper":{"arxiv_id":"1907.03757","last_updated":"2019-07-08T18:00:00Z","snapshot_observed_at":"2026-07-06T08:05:57.037453Z","submitted_at":"2019-07-08T18:00:00Z","title":"Discovery of a close-separation binary quasar at the heart of a z~0.2 merging galaxy and its implications for low-frequency gravitational waves","version":1},"reference_index":36,"source":"pdf_text","source_observed_at":"2026-05-25T00:54:56.610400Z"},"links":{"citing_paper":"/paper/1907.03757"},"observation_digest":"sha256:33ae6fbc2abeb0bc6c508cb4c5bfc9ccb08410fb6a543766ed89db56590bae13","observation_id":"1834a2fc-be60-497e-83b9-ca3ec23b6d9e","resolution":{"observed_at":"2026-05-25T00:55:09.871072Z","resolver_source":"raw_fallback","status":"verified_fuzzy"},"standing_notice":{"events":[],"observation":"No event found in the named queried sources as of 2026-07-20T06:30:07.809122+00:00.","reason":null,"source_receipts":[{"observed_at":"2026-07-20T06:30:07.809122+00:00","source":"crossref"},{"observed_at":"2026-07-20T06:30:01.33724+00:00","source":"retraction_watch"}],"state":"measured"}},{"citation":{"cited_paper":null,"cited_work":{"arxiv_id":null,"doi":null,"metadata_source":"raw_reference","pith_arxiv_id":null,"snapshot_observed_at":"2026-06-05T21:23:00.469572Z","title":null,"venue":null,"work_id":"32aec10c-3cc9-4d3b-8da1-06cbfbd036ba","year":2015},"citing_paper":{"arxiv_id":"1907.03757","last_updated":"2019-07-08T18:00:00Z","snapshot_observed_at":"2026-07-06T08:05:57.037453Z","submitted_at":"2019-07-08T18:00:00Z","title":"Discovery of a close-separation binary quasar at the heart of a z~0.2 merging galaxy and its implications for low-frequency gravitational waves","version":1},"reference_index":37,"source":"pdf_text","source_observed_at":"2026-05-25T00:54:56.610400Z"},"links":{"citing_paper":"/paper/1907.03757"},"observation_digest":"sha256:4256f26ae5e52d12fcda8ee4bcb1719dbd374996efa99ddf111195c319c2095d","observation_id":"19a2a4f1-db9a-47fc-a9c2-0542938f38ff","resolution":{"observed_at":"2026-05-25T00:55:09.863709Z","resolver_source":"raw_fallback","status":"unresolved"},"standing_notice":{"events":[],"observation":"No event found in the named queried sources as of 2026-07-20T06:30:07.809122+00:00.","reason":null,"source_receipts":[{"observed_at":"2026-07-20T06:30:07.809122+00:00","source":"crossref"},{"observed_at":"2026-07-20T06:30:01.33724+00:00","source":"retraction_watch"}],"state":"measured"}},{"citation":{"cited_paper":null,"cited_work":{"arxiv_id":null,"doi":null,"metadata_source":"raw_reference","pith_arxiv_id":null,"snapshot_observed_at":"2026-06-05T21:23:00.469572Z","title":null,"venue":null,"work_id":"36d89941-d7e4-42e7-b210-1c21841cbd55","year":2016},"citing_paper":{"arxiv_id":"1907.03757","last_updated":"2019-07-08T18:00:00Z","snapshot_observed_at":"2026-07-06T08:05:57.037453Z","submitted_at":"2019-07-08T18:00:00Z","title":"Discovery of a close-separation binary quasar at the heart of a z~0.2 merging galaxy and its implications for low-frequency gravitational waves","version":1},"reference_index":38,"source":"pdf_text","source_observed_at":"2026-05-25T00:54:56.610400Z"},"links":{"citing_paper":"/paper/1907.03757"},"observation_digest":"sha256:ceacdd0d817602496b4013063e8235dbba0e010730d8e4335d806234d9ed0c9b","observation_id":"9368e750-9974-4b99-ac20-375f13b9f685","resolution":{"observed_at":"2026-05-25T00:55:09.820717Z","resolver_source":"raw_fallback","status":"unresolved"},"standing_notice":{"events":[],"observation":"No event found in the named queried sources as of 2026-07-20T06:30:07.809122+00:00.","reason":null,"source_receipts":[{"observed_at":"2026-07-20T06:30:07.809122+00:00","source":"crossref"},{"observed_at":"2026-07-20T06:30:01.33724+00:00","source":"retraction_watch"}],"state":"measured"}},{"citation":{"cited_paper":null,"cited_work":{"arxiv_id":null,"doi":null,"metadata_source":"raw_reference","pith_arxiv_id":null,"snapshot_observed_at":"2026-06-05T21:23:00.469572Z","title":null,"venue":null,"work_id":"4baae79e-387b-4497-aa75-f39e64936862","year":2008},"citing_paper":{"arxiv_id":"1907.03757","last_updated":"2019-07-08T18:00:00Z","snapshot_observed_at":"2026-07-06T08:05:57.037453Z","submitted_at":"2019-07-08T18:00:00Z","title":"Discovery of a close-separation binary quasar at the heart of a z~0.2 merging galaxy and its implications for low-frequency gravitational waves","version":1},"reference_index":39,"source":"pdf_text","source_observed_at":"2026-05-25T00:54:56.610400Z"},"links":{"citing_paper":"/paper/1907.03757"},"observation_digest":"sha256:46ba897892afbd18ffc551c36664f7bd978b987f95333be549c161ec591b4337","observation_id":"65d60207-b1a0-4c4b-befb-10a9ab8595a9","resolution":{"observed_at":"2026-05-25T00:55:09.791520Z","resolver_source":"raw_fallback","status":"unresolved"},"standing_notice":{"events":[],"observation":"No event found in the named queried sources as of 2026-07-20T06:30:07.809122+00:00.","reason":null,"source_receipts":[{"observed_at":"2026-07-20T06:30:07.809122+00:00","source":"crossref"},{"observed_at":"2026-07-20T06:30:01.33724+00:00","source":"retraction_watch"}],"state":"measured"}},{"citation":{"cited_paper":null,"cited_work":{"arxiv_id":null,"doi":null,"metadata_source":"raw_reference","pith_arxiv_id":null,"snapshot_observed_at":"2026-06-05T21:23:00.469572Z","title":"K., et al","venue":null,"work_id":"f047cda2-c637-4402-adb1-c17112b1ff5d","year":2016},"citing_paper":{"arxiv_id":"1907.03757","last_updated":"2019-07-08T18:00:00Z","snapshot_observed_at":"2026-07-06T08:05:57.037453Z","submitted_at":"2019-07-08T18:00:00Z","title":"Discovery of a close-separation binary quasar at the heart of a z~0.2 merging galaxy and its implications for low-frequency gravitational waves","version":1},"reference_index":40,"source":"pdf_text","source_observed_at":"2026-05-25T00:54:56.610400Z"},"links":{"citing_paper":"/paper/1907.03757"},"observation_digest":"sha256:52dccfd2dbfa1d0aa3db37d1d53359ad4fccaa6f3d36c091d0a017e4bd336520","observation_id":"479bf786-33e6-490a-8cd7-c345c50b744a","resolution":{"observed_at":"2026-05-25T00:55:09.798866Z","resolver_source":"raw_fallback","status":"verified_fuzzy"},"standing_notice":{"events":[],"observation":"No event found in the named queried sources as of 2026-07-20T06:30:07.809122+00:00.","reason":null,"source_receipts":[{"observed_at":"2026-07-20T06:30:07.809122+00:00","source":"crossref"},{"observed_at":"2026-07-20T06:30:01.33724+00:00","source":"retraction_watch"}],"state":"measured"}},{"citation":{"cited_paper":null,"cited_work":{"arxiv_id":null,"doi":null,"metadata_source":"raw_reference","pith_arxiv_id":null,"snapshot_observed_at":"2026-06-05T21:23:00.469572Z","title":"2005, ApJ, 620, L79","venue":null,"work_id":"a07b655f-f0dc-4422-b001-c5b5ae685f01","year":2005},"citing_paper":{"arxiv_id":"1907.03757","last_updated":"2019-07-08T18:00:00Z","snapshot_observed_at":"2026-07-06T08:05:57.037453Z","submitted_at":"2019-07-08T18:00:00Z","title":"Discovery of a close-separation binary quasar at the heart of a z~0.2 merging galaxy and its implications for low-frequency gravitational waves","version":1},"reference_index":41,"source":"pdf_text","source_observed_at":"2026-05-25T00:54:56.610400Z"},"links":{"citing_paper":"/paper/1907.03757"},"observation_digest":"sha256:8c8f921edc50335f6217e040973188bf73b711bacd897183cba0b3ef1601205b","observation_id":"72513000-9114-4e3c-998d-571fd5d43f49","resolution":{"observed_at":"2026-05-25T00:55:09.824464Z","resolver_source":"raw_fallback","status":"verified_fuzzy"},"standing_notice":{"events":[],"observation":"No event found in the named queried sources as of 2026-07-20T06:30:07.809122+00:00.","reason":null,"source_receipts":[{"observed_at":"2026-07-20T06:30:07.809122+00:00","source":"crossref"},{"observed_at":"2026-07-20T06:30:01.33724+00:00","source":"retraction_watch"}],"state":"measured"}},{"citation":{"cited_paper":null,"cited_work":{"arxiv_id":null,"doi":null,"metadata_source":"raw_reference","pith_arxiv_id":null,"snapshot_observed_at":"2026-06-05T21:23:00.469572Z","title":"E., & Zakamska, N","venue":null,"work_id":"8804c742-39ac-4a57-b765-5e13d76801f2","year":2017},"citing_paper":{"arxiv_id":"1907.03757","last_updated":"2019-07-08T18:00:00Z","snapshot_observed_at":"2026-07-06T08:05:57.037453Z","submitted_at":"2019-07-08T18:00:00Z","title":"Discovery of a close-separation binary quasar at the heart of a z~0.2 merging galaxy and its implications for low-frequency gravitational waves","version":1},"reference_index":42,"source":"pdf_text","source_observed_at":"2026-05-25T00:54:56.610400Z"},"links":{"citing_paper":"/paper/1907.03757"},"observation_digest":"sha256:39d942f0f646a713e8d8fe943e9553eeace63560a51cee3b3524a96b501c44c1","observation_id":"32667adb-b213-4d43-840f-29975357c35f","resolution":{"observed_at":"2026-05-25T00:55:09.878115Z","resolver_source":"raw_fallback","status":"verified_fuzzy"},"standing_notice":{"events":[],"observation":"No event found in the named queried sources as of 2026-07-20T06:30:07.809122+00:00.","reason":null,"source_receipts":[{"observed_at":"2026-07-20T06:30:07.809122+00:00","source":"crossref"},{"observed_at":"2026-07-20T06:30:01.33724+00:00","source":"retraction_watch"}],"state":"measured"}},{"citation":{"cited_paper":null,"cited_work":{"arxiv_id":null,"doi":null,"metadata_source":"raw_reference","pith_arxiv_id":null,"snapshot_observed_at":"2026-06-05T21:23:00.469572Z","title":"R., Vallisneri, M., Ellis, J","venue":null,"work_id":"1086e0a8-e2d3-4bc2-ba8b-4b498012e59e","year":2016},"citing_paper":{"arxiv_id":"1907.03757","last_updated":"2019-07-08T18:00:00Z","snapshot_observed_at":"2026-07-06T08:05:57.037453Z","submitted_at":"2019-07-08T18:00:00Z","title":"Discovery of a close-separation binary quasar at the heart of a z~0.2 merging galaxy and its implications for low-frequency gravitational waves","version":1},"reference_index":43,"source":"pdf_text","source_observed_at":"2026-05-25T00:54:56.610400Z"},"links":{"citing_paper":"/paper/1907.03757"},"observation_digest":"sha256:b4de3db5e0d83d23d5a2e6849261949ddd022e3f53b6f61c685fa20865d2e3ed","observation_id":"1d2b9907-9ab4-4357-b1a6-0c6fead54124","resolution":{"observed_at":"2026-05-25T00:55:09.930701Z","resolver_source":"raw_fallback","status":"verified_fuzzy"},"standing_notice":{"events":[],"observation":"No event found in the named queried sources as of 2026-07-20T06:30:07.809122+00:00.","reason":null,"source_receipts":[{"observed_at":"2026-07-20T06:30:07.809122+00:00","source":"crossref"},{"observed_at":"2026-07-20T06:30:01.33724+00:00","source":"retraction_watch"}],"state":"measured"}},{"citation":{"cited_paper":null,"cited_work":{"arxiv_id":null,"doi":null,"metadata_source":"raw_reference","pith_arxiv_id":null,"snapshot_observed_at":"2026-06-05T21:23:00.469572Z","title":"2014, MNRAS, 437, 32","venue":null,"work_id":"352f2ac2-9aff-49fe-b1e6-d807b75fb263","year":2014},"citing_paper":{"arxiv_id":"1907.03757","last_updated":"2019-07-08T18:00:00Z","snapshot_observed_at":"2026-07-06T08:05:57.037453Z","submitted_at":"2019-07-08T18:00:00Z","title":"Discovery of a close-separation binary quasar at the heart of a z~0.2 merging galaxy and its implications for low-frequency gravitational waves","version":1},"reference_index":44,"source":"pdf_text","source_observed_at":"2026-05-25T00:54:56.610400Z"},"links":{"citing_paper":"/paper/1907.03757"},"observation_digest":"sha256:57610f3c76ff4e2f8c7c6b426af7ad60b24ae0deabe206b5a4033c3c9dc0f5de","observation_id":"6c1b2253-c7a8-46ad-b0cb-4ec1067019f8","resolution":{"observed_at":"2026-05-25T00:55:09.817690Z","resolver_source":"raw_fallback","status":"verified_fuzzy"},"standing_notice":{"events":[],"observation":"No event found in the named queried sources as of 2026-07-20T06:30:07.809122+00:00.","reason":null,"source_receipts":[{"observed_at":"2026-07-20T06:30:07.809122+00:00","source":"crossref"},{"observed_at":"2026-07-20T06:30:01.33724+00:00","source":"retraction_watch"}],"state":"measured"}},{"citation":{"cited_paper":null,"cited_work":{"arxiv_id":null,"doi":null,"metadata_source":"raw_reference","pith_arxiv_id":null,"snapshot_observed_at":"2026-06-05T21:23:00.469572Z","title":"2009, ApJL, 705, L20","venue":null,"work_id":"2167f454-3cb3-45f5-90fa-d5d0229cb106","year":2009},"citing_paper":{"arxiv_id":"1907.03757","last_updated":"2019-07-08T18:00:00Z","snapshot_observed_at":"2026-07-06T08:05:57.037453Z","submitted_at":"2019-07-08T18:00:00Z","title":"Discovery of a close-separation binary quasar at the heart of a z~0.2 merging galaxy and its implications for low-frequency gravitational waves","version":1},"reference_index":45,"source":"pdf_text","source_observed_at":"2026-05-25T00:54:56.610400Z"},"links":{"citing_paper":"/paper/1907.03757"},"observation_digest":"sha256:d0016406ab5c433bfce2f0229da714efb45cdba012ac390d1e41f02a6c47f395","observation_id":"c1731288-33b0-4e8d-9af9-a8641facb154","resolution":{"observed_at":"2026-05-25T00:55:09.845607Z","resolver_source":"raw_fallback","status":"verified_fuzzy"},"standing_notice":{"events":[],"observation":"No event found in the named queried sources as of 2026-07-20T06:30:07.809122+00:00.","reason":null,"source_receipts":[{"observed_at":"2026-07-20T06:30:07.809122+00:00","source":"crossref"},{"observed_at":"2026-07-20T06:30:01.33724+00:00","source":"retraction_watch"}],"state":"measured"}},{"citation":{"cited_paper":null,"cited_work":{"arxiv_id":null,"doi":null,"metadata_source":"raw_reference","pith_arxiv_id":null,"snapshot_observed_at":"2026-06-05T21:23:00.469572Z","title":"G., Adelman, J., Anderson, John E., J., et al","venue":null,"work_id":"0bb33160-a46e-4b14-bffa-a38b532d7ac9","year":2000},"citing_paper":{"arxiv_id":"1907.03757","last_updated":"2019-07-08T18:00:00Z","snapshot_observed_at":"2026-07-06T08:05:57.037453Z","submitted_at":"2019-07-08T18:00:00Z","title":"Discovery of a close-separation binary quasar at the heart of a z~0.2 merging galaxy and its implications for low-frequency gravitational waves","version":1},"reference_index":46,"source":"pdf_text","source_observed_at":"2026-05-25T00:54:56.610400Z"},"links":{"citing_paper":"/paper/1907.03757"},"observation_digest":"sha256:fa9488ccb64e3344829b8ddff529b11d8f90a1d4444a32ccda0ef2060f552cba","observation_id":"9dd24865-8b4d-47f4-8c5e-65e44924d3b3","resolution":{"observed_at":"2026-05-25T00:55:09.838390Z","resolver_source":"raw_fallback","status":"verified_fuzzy"},"standing_notice":{"events":[],"observation":"No event found in the named queried sources as of 2026-07-20T06:30:07.809122+00:00.","reason":null,"source_receipts":[{"observed_at":"2026-07-20T06:30:07.809122+00:00","source":"crossref"},{"observed_at":"2026-07-20T06:30:01.33724+00:00","source":"retraction_watch"}],"state":"measured"}},{"citation":{"cited_paper":null,"cited_work":{"arxiv_id":null,"doi":null,"metadata_source":"raw_reference","pith_arxiv_id":null,"snapshot_observed_at":"2026-06-05T21:23:00.469572Z","title":"2003, ApJ, 599","venue":null,"work_id":"ce99e885-3674-4c82-93f0-cd8c0d4f3d8f","year":2003},"citing_paper":{"arxiv_id":"1907.03757","last_updated":"2019-07-08T18:00:00Z","snapshot_observed_at":"2026-07-06T08:05:57.037453Z","submitted_at":"2019-07-08T18:00:00Z","title":"Discovery of a close-separation binary quasar at the heart of a z~0.2 merging galaxy and its implications for low-frequency gravitational waves","version":1},"reference_index":47,"source":"pdf_text","source_observed_at":"2026-05-25T00:54:56.610400Z"},"links":{"citing_paper":"/paper/1907.03757"},"observation_digest":"sha256:928209fe4b4b989dbaaa31adea1b244e23977d47c6c42d8bce033b51bde7525c","observation_id":"de611a4e-7cbe-4696-8243-8071bd59583e","resolution":{"observed_at":"2026-05-25T00:55:09.834626Z","resolver_source":"raw_fallback","status":"verified_fuzzy"},"standing_notice":{"events":[],"observation":"No event found in the named queried sources as of 2026-07-20T06:30:07.809122+00:00.","reason":null,"source_receipts":[{"observed_at":"2026-07-20T06:30:07.809122+00:00","source":"crossref"},{"observed_at":"2026-07-20T06:30:01.33724+00:00","source":"retraction_watch"}],"state":"measured"}},{"citation":{"cited_paper":null,"cited_work":{"arxiv_id":null,"doi":null,"metadata_source":"raw_reference","pith_arxiv_id":null,"snapshot_observed_at":"2026-06-05T21:23:00.469572Z","title":"2019, MNRAS, 482","venue":null,"work_id":"30d1a0f7-43c8-4308-88ce-f191ad23c620","year":2019},"citing_paper":{"arxiv_id":"1907.03757","last_updated":"2019-07-08T18:00:00Z","snapshot_observed_at":"2026-07-06T08:05:57.037453Z","submitted_at":"2019-07-08T18:00:00Z","title":"Discovery of a close-separation binary quasar at the heart of a z~0.2 merging galaxy and its implications for low-frequency gravitational waves","version":1},"reference_index":48,"source":"pdf_text","source_observed_at":"2026-05-25T00:54:56.610400Z"},"links":{"citing_paper":"/paper/1907.03757"},"observation_digest":"sha256:3e05c10d130923eb47684716a1ae20f68bdceebcda5f6287729f55e490ff8071","observation_id":"2fcca35c-6308-4560-b246-89ce9c2b3e1a","resolution":{"observed_at":"2026-05-25T00:55:09.859882Z","resolver_source":"raw_fallback","status":"verified_fuzzy"},"standing_notice":{"events":[],"observation":"No event found in the named queried sources as of 2026-07-20T06:30:07.809122+00:00.","reason":null,"source_receipts":[{"observed_at":"2026-07-20T06:30:07.809122+00:00","source":"crossref"},{"observed_at":"2026-07-20T06:30:01.33724+00:00","source":"retraction_watch"}],"state":"measured"}}],"paper":{"arxiv_id":"1907.03757","last_updated":"2019-07-08T18:00:00Z","latest_version":1,"primary_category":"astro-ph.GA","snapshot_observed_at":"2026-07-06T08:05:57.037453Z","submitted_at":"2019-07-08T18:00:00Z","title":"Discovery of a close-separation binary quasar at the heart of a z~0.2 merging galaxy and its implications for low-frequency gravitational waves"},"reference_resolution":{"displayed":48,"state_counts":{"malformed_identifier":0,"metadata_mismatch":2,"parse_uncertain":0,"unresolved":7,"verified_exact":1,"verified_fuzzy":38},"total_outbound_references":48},"refusal":"A citation records a reference. It does not transfer a finding from one paper to another.","schema":"pith.paper-citation-record.v1","standing_sources":[{"observed_at":"2026-07-20T06:30:07.809122+00:00","source":"crossref"},{"observed_at":"2026-07-20T06:30:01.33724+00:00","source":"retraction_watch"}],"thesis":"As of 23 July 2026, this Paper Citation Record lists 48 of 48 outbound references and 0 inbound Pith citation observations for arXiv:1907.03757."}