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Observations of GRBs with the fermi large area telescope
KTH, School of Engineering Sciences (SCI), Physics, Particle and Astroparticle Physics.
2011 (English)In: Nuovo cimento della societa italiana de fisica. C, Geophysics and space physics, ISSN 1124-1896, E-ISSN 1826-9885, Vol. 34, no 3, 261-265 p.Article in journal (Refereed) Published
Abstract [en]

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 < 300GeV) and Gammaray Burst Monitor (GBM: from 8keV to 40MeV), 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.

Place, publisher, year, edition, pages
2011. Vol. 34, no 3, 261-265 p.
National Category
Physical Sciences
Identifiers
URN: urn:nbn:se:kth:diva-148759DOI: 10.1393/ncc/i2011-10880-3Scopus ID: 2-s2.0-84870466329OAI: oai:DiVA.org:kth-148759DiVA: diva2:738349
Note

QC 20140818

Available from: 2014-08-18 Created: 2014-08-11 Last updated: 2017-12-05Bibliographically approved

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