On the origin of the multi-GeV photons from the closest burst with intermediate luminosity: GRB 190829A

Understand

Very-high-energy (VHE) emission is usually interpreted in the synchrotron-self Compton (SSC) scenario, and expected from the low-redshift and high-luminosity gamma-ray bursts (GRBs), as GRB 180720B and GRB 190114C.

• Recently, VHE emission was detected by the H.E.S.S.
• telescopes from one of the closest burst GRB 190829A which was associated with the supernova (SN) 2019oyw.
• In this paper, we present a temporal and spectral analysis from optical bands to Fermi-LAT energy range over multiple observational periods beginning just after the BAT trigger time and extending for almost three months.