Observations of GRBs with the Fermi Large Area Telescope

Moretti, E. (2011) Observations of GRBs with the Fermi Large Area Telescope. Il nuovo cimento C, 34 (3). pp. 261-265. ISSN 1826-9885

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Fermi Gamma-ray Space Telescope successfully detected high-energy emission from 20 GRBs so far. Thanks to its unprecedented very wide energy coverage of Large Area Telescope (LAT: from 25MeV to > 300 GeV) and Gammaray Burst Monitor (GBM: from 8 keV to 40 MeV), Fermi provided new observational pictures of GRBs. Here we review some of the GRB properties seen by the LAT instrument such as the delayed onset and longer durations of high-energy emission compared with low-energy emission of the GBM. An extra spectral component in high and low energy is detected in some GRBs and moreover for the first time a cut-off in the spectral extra component is seen. These temporal and spectral distinct behaviors inspire many implications on the emission mechanism, including leptonic, hadronic and afterglow origin. Fermi also placed constraints both on the bulk Lorentz factor of the relativistic jet, larger than 1000 for bright LAT GRBs, and on outside-GRB topics such as quantum gravity.

Item Type: Article
Uncontrolled Keywords: γ-ray sources; γ-ray bursts
Subjects: 500 Scienze naturali e Matematica > 530 Fisica
Depositing User: Marina Spanti
Date Deposited: 06 Apr 2020 18:48
Last Modified: 06 Apr 2020 18:48
URI: http://eprints.bice.rm.cnr.it/id/eprint/17280

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