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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 × 10
Xia et al. (Mon,) studied this question.
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