Carpet-2 search for gamma rays above 100 TeV in coincidence with HAWC and IceCube alerts

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 ~100 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.

arXiv comment4 pages paper + 5 pages Supplemental Material. V2: references added, version accepted by JETP Letters

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Cited by in corpus (5)

• IceCat-1: the IceCube Event Catalog of Alert Tracks
• Possible Evidence for Lorentz Invariance Violation in Gamma-ray Burst 221009A
• Observation of photons above 300 TeV associated with a high-energy neutrino from the Cygnus region
• GRB 221009A: A light dark matter burst or an extremely bright Inverse Compton component?
• Upper limits on the isotropic diffuse flux of cosmic PeV photons from Carpet-2 observations