An Evolving GeV Spectrum from Prompt to Afterglow: The Case of GRB 160509A
An Evolving GeV Spectrum from Prompt to Afterglow: The Case of GRB 160509A
We present the high-energy emission properties of GRB 160509A, from its prompt mission to late afterglow phase. GRB 160509A contains two emission episodes: 0-40s and 280-420s after the burst onset (t0). The relatively high fluence of GRB 160509A allows us to establish an evolving spectrum above 100 MeV. During the …