Spectral and temporal analysis of the joint Swift/BAT-Fermi/GBM GRB sample
Abstract
Using the gamma-ray bursts simultaneously detected by Swift/BAT and Fermi/GBM we performed a joint spectral and temporal analysis of the prompt emission data and confirm the rough correlation between the BAT-band photon index GammaBAT and the peak spectral energy Epeak. With the redshift known sub-sample, we derived the isotropic gamma-ray energy Egamma,iso and also confirm the Egamma,iso - Epeak,rest relation, with a larger scatter than the Amati sample but consistent with GBM team analyses. We also compare the T90 values derived in the GBM band with those derived in the BAT band and find that for long GRBs the BAT T90 is usually longer than the GBM T90, while for short GRBs the trend reverses. This is consistent with the soft/hard nature of long/short GRBs and suggests the importance of an energy-dependent temporal analysis of GRBs.
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