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Galactic sites of acceleration of cosmic rays to energies of order 10^15 eVand higher, dubbed PeVatrons, reveal themselves by recently discovered gammaradiation of energies above 100 TeV. However, joint gamma-ray and neutrinoproduction, which marks unambiguously cosmic-ray interactions with ambientmatter and radiation, was not observed until now. In November 2020, the IceCubeneutrino observatory reported an ~150 TeV neutrino event from the direction ofone of the most promising Galactic PeVatrons, the Cygnus Cocoon. Here we reporton the observation of a 3.1-sigma (post trial) excess of atmospheric airshowers from the same direction, observed by the Carpet-2 experiment andconsistent with a few-months flare in photons above 300 TeV, in temporalcoincidence with the neutrino event. The fluence of the gamma-ray flare is ofthe same order as that expected from the neutrino observation, assuming thestandard mechanism of neutrino production. This is the first evidence for thejoint production of high-energy neutrinos and gamma rays in a Galactic source.

Observation of photons above 300 TeV associated with a high-energy neutrino from the Cygnus region