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Spectral properties of 438 GRBs detected by Fermi/GBM | | L. Nava
; G. Ghirlanda
; G. Ghisellini
; A. Celotti
; | | Date: |
13 Dec 2010 | | Abstract: | We present the results of the spectral analysis of the public data of 438
Gamma Ray Bursts (GRBs) detected by the Fermi Gamma ray Burst Monitor (GBM) up
to March 2010. For 432 bursts we could fit the time integrated spectrum. In 316
cases we can reliably constrain the peak energy Epeak of their
u F_
u
spectrum by analyzing their time integrated spectrum between 8 keV and 35 MeV.
73% of these spectra are fitted by a power law with an exponential cutoff, and
the remaining with the Band function. Among these 316 GRBs, 272 and 44 belong
to the long and short GRB class, respectively. Long GRBs have a typical peak
energy Epeak=160 keV and low energy spectral index alpha=-0.9. Short GRBs have
harder peak energy (Epeak=490 keV) and harder low energy spectral index
(alpha=-0.52) than long bursts. For each Fermi GRB we analyzed also the
spectrum corresponding to the peak flux of the burst. On average, the peak
spectrum has harder low energy spectral index but similar Epeak than the
corresponding time-integrated spectrum for the same burst. The spectral
parameters derived in our analysis of Fermi/GBM bursts are globally consistent
with those reported in the GRB Cicular Network (GCN) archive after December
2008, while we found systematic differences, concerning the low energy power
law index, for earlier bursts. | | Source: | arXiv, 1012.2863 | | Services: | Forum | Review | PDF | Favorites | |
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