A delayed 400 GeV photon from GRB 221009A and implication on the intergalactic magnetic field

Abstract

Large High Altitude Air Shower Observatory has detected $0.2-13$ TeV emission of GRB 221009A within 2000 s since the trigger. Here we report the detection of a 400 GeV photon, without accompanying prominent low-energy emission, by Fermi Large Area Telescope in this direction with a 0.4 days' delay. Given an intergalactic magnetic field strength of about $4\times 10^{-17}$ G, which is comparable to limits from TeV blazars, the delayed 400 GeV photon can be explained as the cascade emission of about 10 TeV gamma rays. We estimate the probabilities of the cascade emission that can result in one detectable photon beyond 100 GeV by Fermi Large Area Telescope within $0.3-1$ days is about 2$\%$ whereas it is about 20.5$\%$ within $0.3-250$ days. Our results show that Synchrotron Self-Compton explanation is less favored with probabilities lower by a factor of about $3-30$ than the cascade scenario.

9 pages, 4 figures, Nature Communications, in press

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• Carpet-3 detection of a photon-like air shower with estimated primary energy above 100 TeV in a spatial and temporal coincidence with GRB 221009A
• The brightest GRB ever detected: GRB 221009A as a highly luminous event at z = 0.151
• Constraints on the intergalactic magnetic field from Fermi-LAT observations of GRB 221009A
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• Imprints of Dark Photons on Gravitational Wave Polarizations
• UHECRs Propagation and their Multimessengers: Upper limits and the Impact of the Extragalactic Magnetic Field