The origin of the photospheric emission of GRB 220426A
The origin of the photospheric emission of GRB 220426A
ABSTRACT GRB 220426A is a bright gamma-ray burst (GRB) dominated by the photospheric emission. We perform several tests to speculate the origin of this photospheric emission. The dimensionless entropy η is large, which is not usual if we assume that it is a pure hot fireball launched by neutrino–antineutrino annihilation …