GWTC-3: Compact Binary Coalescences Observed by LIGO and Virgo During the Second Part of the Third Observing Run
Pith reviewed 2026-05-11 09:23 UTC · model grok-4.3
The pith
The GWTC-3 catalog now includes 90 compact binary coalescence events with the first confirmed neutron star-black hole binaries.
A machine-rendered reading of the paper's core claim, the machinery that carries it, and where it could break.
Core claim
Updating the previous GWTC-2.1, the catalog presents 35 compact binary coalescence candidates identified during O3b with p_astro > 0.5. These are consistent with binary black holes or neutron star-black hole binaries, with the first confident observations of the latter type. Including these, the full GWTC-3 contains 90 candidates with p_astro > 0.5 across the first three observing runs, providing an unprecedented view of the properties of black holes and neutron stars.
What carries the argument
The search algorithms that compute the probability of astrophysical origin p_astro to select candidates above a threshold of 0.5.
Load-bearing premise
The search pipelines and p_astro calculations accurately distinguish true astrophysical signals from noise and artifacts without significant misclassification at the chosen threshold.
What would settle it
A reanalysis of the O3b data by an independent team that finds substantially different numbers of events with p_astro > 0.5 or fails to confirm the neutron star-black hole candidates.
read the original abstract
The third Gravitational-Wave Transient Catalog (GWTC-3) describes signals detected with Advanced LIGO and Advanced Virgo up to the end of their third observing run. Updating the previous GWTC-2.1, we present candidate gravitational waves from compact binary coalescences during the second half of the third observing run (O3b) between 1 November 2019, 15:00 UTC and 27 March 2020, 17:00 UTC. There are 35 compact binary coalescence candidates identified by at least one of our search algorithms with a probability of astrophysical origin $p_\mathrm{astro} > 0.5$. Of these, 18 were previously reported as low-latency public alerts, and 17 are reported here for the first time. Based upon estimates for the component masses, our O3b candidates with $p_\mathrm{astro} > 0.5$ are consistent with gravitational-wave signals from binary black holes or neutron star-black hole binaries, and we identify none from binary neutron stars. However, from the gravitational-wave data alone, we are not able to measure matter effects that distinguish whether the binary components are neutron stars or black holes. The range of inferred component masses is similar to that found with previous catalogs, but the O3b candidates include the first confident observations of neutron star-black hole binaries. Including the 35 candidates from O3b in addition to those from GWTC-2.1, GWTC-3 contains 90 candidates found by our analysis with $p_\mathrm{astro} > 0.5$ across the first three observing runs. These observations of compact binary coalescences present an unprecedented view of the properties of black holes and neutron stars.
Editorial analysis
A structured set of objections, weighed in public.
Referee Report
Summary. The manuscript presents GWTC-3, updating prior catalogs with 35 compact binary coalescence candidates detected during O3b (1 Nov 2019–27 Mar 2020) that satisfy p_astro > 0.5. Eighteen of these were previously reported as low-latency alerts and seventeen are new; combined with GWTC-2.1 this yields a total of 90 candidates across O1–O3. The candidates are classified as binary black holes or neutron-star–black-hole systems on the basis of component-mass estimates, with the first confident NS-BH identifications noted, while the text explicitly states that matter effects cannot be measured from the gravitational-wave data alone.
Significance. If the reported detections and classifications hold, the expanded catalog supplies a substantially larger sample for population studies of black-hole and neutron-star masses and spins. The first confident NS-BH events are a notable addition. The analysis applies the collaboration’s established matched-filter pipelines, Bayesian parameter estimation, and multi-pipeline consistency checks, which are the same methods used in previous GWTC releases and therefore inherit their demonstrated reliability.
minor comments (2)
- [Abstract] Abstract: the statement that GWTC-3 contains 90 candidates would be clearer if it explicitly restated the number contributed by GWTC-2.1 rather than only noting the addition of 35 O3b events.
- [Results] The text notes that no binary-neutron-star candidates were identified in O3b; a brief quantitative comparison of the expected BNS rate with the search sensitivity would help readers assess whether this absence is statistically expected.
Simulated Author's Rebuttal
We thank the referee for their positive review and recommendation to accept the manuscript. The referee's summary accurately captures the content of GWTC-3, including the 35 new O3b candidates, the total of 90 events, and the first confident NS-BH identifications, along with the explicit statement that matter effects cannot be measured from the gravitational-wave data alone.
Circularity Check
No significant circularity in GWTC-3 observational catalog
full rationale
The paper reports an observational catalog of 90 compact binary coalescence candidates (including 35 new O3b events) with p_astro > 0.5, derived from direct analysis of LIGO/Virgo detector strain data via established search pipelines, FAR calculations, and parameter estimation. These steps operate on independent raw data and do not reduce any claimed result to a quantity defined in terms of the catalog itself. Self-citations to prior GWTC papers and collaboration methods describe reusable analysis techniques applied to new observations, rather than load-bearing premises that force the detections by construction. The identification of NS-BH candidates rests on mass posteriors from the signals, which are falsifiable against external benchmarks and not tautological.
Axiom & Free-Parameter Ledger
axioms (2)
- domain assumption General relativity accurately describes the gravitational waveforms from compact binary coalescences in the detector band
- domain assumption Detector noise is stationary and Gaussian on the timescales of the signals
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