Aachen 2019 – scientific programme

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T: Fachverband Teilchenphysik

T 39: Gamma-Astronomie I

T 39.6: Talk

Tuesday, March 26, 2019, 17:25–17:40, S14

GRB observations with H.E.S.S. II — •Edna L. Ruiz-Velasco for the H.E.S.S collaboration — Max Planck Institute for Nuclear Physics, Heidelberg, Germany

Imaging Atmospheric Cherenkov Telescopes (IACTs) present larger effective area than GeV-range gamma-ray satellites like Fermi-LAT at energies above 50 GeV. The later, has proven the existence of non-thermal high energetic gamma-ray emission of many gamma-ray burst (GRBs) up to energy of tenths of GeVs. The High Energy Stereoscopic System (H.E.S.S) is an IACT array composed by four 12 m diameter and one 28 m diameter telescopes, making it the first hybrid array of Cherenkov Telescopes. Its characteristics allows and energy threshold of ~100 GeV and unprecedented sensitivity making it perfectly suitable for studying the very-high energy emission of GRBs. In this contribution we will describe the H.E.S.S. GRBs observation program, the trigger methods and results on several GRBs observed in the previous years. This compilation represents the largest list of GRB triggers followed up with IACTs and provides numerous inputs for GRB modelling at the very high energies.