出版社:SISSA, Scuola Internazionale Superiore di Studi Avanzati
摘要:The Fermi Large Area Telescope (LAT; [8]) is a pair-conversion detector of high-energy gamma rays of energies ranging from 20 MeV to more than 300 GeV. Since the launch in June 2008, it has been operating in synergy with the Gamma-ray Burst Monitor (GBM; [13]), which covers the entire unocculted sky and is designed for gamma-ray transients’ detection and spectroscopy between 8 keV and 40 MeV. The LAT detects ∼9 gamma-ray bursts (GRB) per year, which represents ∼8% of the GBM bursts occuring in its field of view. We present a systematic study of the GRB properties observed with the LAT, and discuss the LAT non-detections of some GBM bright and hard bursts, in an effort to understand the difference in GRB rates from both instruments