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Multi-wavelength observation of MAXI J1820+070 with MAGIC, VERITAS and H.E.S.S

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arxiv 1908.06958 v2 pith:LG773MEU submitted 2019-08-19 astro-ph.HE

Multi-wavelength observation of MAXI J1820+070 with MAGIC, VERITAS and H.E.S.S

J. Hoang , E. Molina , M. L\'opez , M. Rib\'o , O. Blanch , J. Cortina , G. Maier , N. Park
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M. de Naurois E. de Ona Wilhelmi J.P. Ernenwein D. Malyshev A. Mitchell S. Ohm R. Zanin (on behalf of the MAGIC VERITAS H.E.S.S. Collaborations)
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keywords maxij1820magicopticalcentraldiscoveredenergygamma-ray
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MAXI J1820+070 is a new low-mass microquasar hosting a black hole recently discovered in X-rays by the MAXI instrument. It is the counterpart of ASASSN-18ey, discovered in optical a few days before by ASAS-SN. This source underwent a major outburst in 2018, during which it completed the typical "q-shaped" path in the hardness-intensity diagram. MAGIC, VERITAS and H.E.S.S. gamma-ray telescopes observed the sky position of MAXI J1820+070 for a total of more than 90 hours in 2018. In addition, some observations were carried out using MAGIC Central Pixel - a dedicated central pixel capable of detecting fast optical signals (10 kHz sampling rate, peak sensitivity in the U-band). This contribution presents the methods used to search for transient optical and very high energy gamma-ray emission from MAXI J1820+070, as well as the latest results in these energy ranges.

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