Orateur
Description
Gamma-ray bursts (GRB) are cosmoligocal sources with average redshift around 2, emitting radiation over the entire electromagnetic spectrum. Two different sites are responsible for the radiated emission: one internal to the relativistic jet (responsible for the prompt, higly-variable soft gamma-ray radiation detected over timescales of ms to tens of seconds) and one external, originated from the shock driven by the front of the jet into the surrounding medium. The latter one, called afterglow radiation, is detected from the radio to the gamma-ray domain. Since 2019 we know that afterglow radiation can extend to the very-high energy domain, with photons detected by Cherenkov Telescopes in the range 50 GeV-10 TeV. These energies, coupled with the large distances of these sources, make GRBs a potentially powerful tool for Lorentz Invariance Violation (LIV) studies. In this contribution, I will review the physics and the modeling of afterglow emission, with a particular focus on very-high energy radiation and applications to LIV studies.
