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ABSTRACT MAXI J1820+070 is a low-mass X-ray binary with a black hole (BH) as a compact object. This binary underwent an exceptionally bright X-ray outburst from 2018 March to October, showing evidence of a non-thermal particle population through its radio emission during this whole period. The combined results of 59.5 h of observations of the MAXI J1820+070 outburst with the H.E.S.S., MAGIC and VERITAS experiments at energies above 200 GeV are presented, together with Fermi-LAT data between 0.1 and 500 GeV, and multiwavelength observations from radio to X-rays. Gamma-ray emission is not detected from MAXI J1820+070, but the obtained upper limits and the multiwavelength data allow us to put meaningful constraints on the source properties under reasonable assumptions regarding the non-thermal particle population and the jet synchrotron spectrum. In particular, it is possible to show that, if a high-energy (HE) gamma-ray emitting region is present during the hard state of the source, its predicted flux should be at most a factor of 20 below the obtained Fermi-LAT upper limits, and closer to them for magnetic fields significantly below equipartition. During the state transitions, under the plausible assumption that electrons are accelerated up to ∼500 GeV, the multiwavelength data and the gamma-ray upper limits lead consistently to the conclusion that a potential HE and very-HE gamma-ray emitting region should be located at a distance from the BH ranging between 1011 and 1013 cm. Similar outbursts from low-mass X-ray binaries might be detectable in the near future with upcoming instruments such as CTA.more » « less
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Abdalla, H. ; Aharonian, F. ; Ait Benkhali, F. ; Angüner, E. O. ; Arcaro, C. ; Armand, C. ; Armstrong, T. ; Ashkar, H. ; Backes, M. ; Baghmanyan, V. ; et al ( , The Astrophysical Journal)
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Algaba, J. C. ; Anczarski, J. ; Asada, K. ; Baloković, M. ; Chandra, S. ; Cui, Y.-Z. ; Falcone, A. D. ; Giroletti, M. ; Goddi, C. ; Hada, K. ; et al ( , The Astrophysical Journal Letters)null (Ed.)