Spectral properties of 438 GRBs detected by Fermi/GBM

Understand

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 318 cases we can reliably constrain the peak energy Epeak of their \nu F_\nu spectrum by analyzing their time integrated spectrum between 8 keV and 35 MeV.
• 80% of these spectra are fitted by a power law with an exponential cutoff, and the remaining with the Band function.