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T: Fachverband Teilchenphysik

T 80: Invited Topical Talks 6

T 80.1: Eingeladener Vortrag

Donnerstag, 7. März 2024, 14:00–14:30, Geb. 30.22: Gaede-HS

The advent of TeV gamma-ray astronomy with gamma-ray bursts — •Alessio Berti — Max Planck Institute for Physics, Garching, Germany

Gamma-ray bursts (GRBs) are the prototypical transient sources and the most energetic ones in the electromagnetic domain. After their first discovery more than 50 years ago, they have been the subject of searches across all wavelengths. Since then, the understanding of these enigmatic sources has greatly improved, especially in the recent years in the context of multi-messenger astrophysics. One of the most intriguing bands is the very-high-energy range (VHE, E100 GeV), through which one can probe the presence of new emission components and better understand the properties of particle acceleration and energy dissipation within GRBs. At these energies and above, Cherenkov telescopes and extensive air shower arrays have been hunting for GRBs for decades. All previous VHE observations did not result in any detection. This changed suddenly in 2019, when the MAGIC and H.E.S.S. collaborations announced the detection of VHE emission from two distinct GRBs, followed by two additional events within the following two years. More recently, in October 2022 the LHAASO collaboration announced the detection of another event. These detections provide unique datasets to improve our understanding of GRB physics, but they can be used also for fundamental physics studies. In this contribution I will present the journey which has led to these discoveries, what the GRB community has learned from them and what are the perspectives for future searches.

Keywords: gamma-ray bursts; transients; astroparticle physics; radiation mechanisms