Marc Klinger | Very-high-energy gamma-ray burst afterglows: A story about Bactrians, Dromedaries and lots of Butterflies

Friday 18 Nov 2022, 10:15 → 12:00 Europe/Berlin

SR 05 (Villa + Zoom)

Gamma-ray bursts (GRBs) are amongst the brightest explosions in the Universe, releasing during a second-long burst an energy comparable to that of a supernova. After a prompt phase with complex phenomenology of temporal features, the GRB emission typically decays smoothly. In the last years, this afterglow phase has also been successfully detected in the Very-High-Energy (VHE; >100 GeV) regime for a few nearby and bright GRBs . The origin of this VHE emission challenges the established fireball model and raises the question of requiring a new spectral component. I will focus on GRB 190114C observed from keV up to TeV energies by Swift (XRT, BAT), Fermi (GBM, LAT) and MAGIC, and discuss the preference for an additional inverse Compton component, based on a full-likelihood analysis.

AP-Seminar_18-11-22_M-Klinger_VHE-GRBafterglow.mp4