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| VOLUME 112 (2020) | ISSUE 12 | PAGE 797 |
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Carpet-2 search for gamma rays above 100 TeV in coincidence with HAWC and IceCube alerts1)
D. D. Dzhappuev+, Yu. Z. Afashokov+, I. M. Dzaparova+*, E. A. Gorbacheva+, I. S. Karpikov+, M. M. Khadzhiev+, N. F. Klimenko+, A. U. Kudzhaev+, A. N. Kurenya+, A. S. Lidvansky+, O. I. Mikhailova+, V. B. Petkov+*, V. S. Romanenko+, G. I. Rubtsov+, S. V. Troitsky+ 2), I. B. Unatlokov+, A. F. Yanin+, Ya. V. Zhezher+, K. V. Zhuravleva+
+Institute for Nuclear Research of the Russian Academy of Sciences, 117312 Moscow, Russia *Institute of Astronomy, Russian Academy of Sciences, 119017 Moscow, Russia
Abstract
We report on the search of astrophysical gamma rays with energies in the 100 TeV to several PeV range arriving in directional and temporal coincidence with public alerts from HAWC (TeV gamma rays) and IceCube (neutrinos above  TeV). The observations have been
performed with the Carpet-2 air-shower detector at the Baksan Neutrino
Observatory, working in the "photon-friendly" mode since 2018. Photon
candidate showers are selected by their low muon content. No
significant excess of the photon candidates have been observed, and upper
limits on gamma-ray fluences associated with the alerts are obtained. For
events with good viewing conditions, the Carpet-2 effective area for
photons is of the order of the IceCube effective area for neutrinos of
the same energy, so the constraints start to probe the production of
neutrinos in fast flares of Galactic sources.
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