High-Energy Fermi GRBs, Short and Long

Details High-Energy Fermi GRBs, Short and Long High-Energy Fermi GRBs, Short and Long

Jan 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010aas...21520702g&link_type=abstract

American Astronomical Society, AAS Meeting #215, #207.02; Bulletin of the American Astronomical Society, Vol. 42, p.310

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Scientific paper

During its first year of operation the Fermi Gamma-Ray Space Telescope has more than doubled the number of Gamma-Ray Bursts (GRBs) detected at high energies (>100 MeV). Thanks to the very wide energy range covered by Fermi's Gamma-ray Burst Monitor (GBM; 8 keV to 40 MeV) and Large Area Telescope (LAT; 25 MeV to >300 GeV) it has measured the prompt GRB emission spectrum over an unprecedentedly large energy range (from 8 keV to 30 GeV). I will present highlights from Fermi observations of the prompt emission from GRBs of both the short and long classes, and compare between their properties at high energies. Interesting new observations will be discussed along with some of their possible implications, including:
(i) what can we learn from the Fermi-LAT GRB detection rate,
(ii) the detection (or in other cases, lack thereof) of a distinct spectral component at high (and sometimes also at low) energies, and possible implications for the prompt GRB emission mechanism,
(iii) the later onset (and longer duration) of the high-energy emission (>100 MeV) compared to the low-energy (< 1 MeV) emission that is seen in most Fermi-LAT GRBs,
(iv) limits on Lorentz invariance violation (i.e. on a possible small dependence of the speed of light on the photon energy).
(v) lower-limits on the bulk Lorentz factor of the GRB outflow.

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