Gamma-ray bursts under a new light: the TeV emission from GRB190114C seen by the MAGIC telescopes
Giorno 10 dicembre 2019, con inizio alle ore 16:00, presso l'Aula A del DFA, su invito del Prof. Franco Leone ed in collaborazione con INAF-OACT, il Dr Antonio Stamerra (INAF-Osservatorio Astronomico di Roma & Scuola Normale Superiore, Pisa) terrà un seminario dal titolo Gamma-ray bursts under a new light: the TeV emission from GRB190114C seen by the MAGIC telescopes.
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Abstract. Gamma-ray bursts (GRBs) are the most luminous sources of electromagnetic radiation known in the Universe. GRBs had been observed over a broad energy range from the radio band up to GeV gamma rays, but the TeV gamma-ray band had remained terra incognita for a long time. Thanks to the MAGIC telescopes, designed to catch the fast glimpses of the GRBs, the first ever clear detection in this band was achieved for GRB 190114C, a bright, long GRB. The TeV emission from GRB190114C belongs to a new energetic component, providing an energy output comparable at the one at lower energies. We will discuss the details of the observations by MAGIC and the accompanying multi-frequency measurements by more than 20 instruments, from radio to gamma-rays, and the inferences on the emission mechanisms. This historical, highly significant detection has followed an intriguing hint of TeV emission from GRB 160821B, a short GRB with an associated kilonova. This hint, if real, has potential multi-messenger implications on the detectability of gravitational wave alerts in high-energy gamma-rays.