GRB 221009A exhibits a TeV spectral downturn explained by neutron-induced synchrotron photons as a prompt emission echo, while intergalactic cascades are suppressed for typical filament magnetic fields above 1 nG.
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Multi-TeV $\gamma$-ray candidates from GRB 221009A: a downturn in the intrinsic $\gamma$-ray spectrum, an echo of the prompt emission phase, and intergalactic electromagnetic cascades
GRB 221009A exhibits a TeV spectral downturn explained by neutron-induced synchrotron photons as a prompt emission echo, while intergalactic cascades are suppressed for typical filament magnetic fields above 1 nG.