NBIA Seminar: Lara Nava

Very high energy (VHE, >100 GeV) emission from GRBs has eluded for several years all attempts of detection by Cherenkov telescopes, until the recent detection of strong VHE emission from GRB 190114C (z=0.42). Modeling of the multi-wavelength observations (radio to TeV) in terms of synchrotron and synchrotron self-Compton radiation produced at the external shock allows us to estimate properties that are usually unconstrained, such as the density of the external medium, the energy of the emitting particles, and the strength of the shock-amplified magnetic field. Since the first announcement of VHE detection from a GRB, three more GRBs have been firmly detected by MAGIC or H.E.S.S.. In this talk I review the present status of observations and interpretation of HE and VHE emission from GRBs. Prospects for future detections with the CTA, revised in light of these recent observations, reveal that the VHE band is a very promising energy window for progressing our knowledge of GRB physics.