Journal Article

Spectral and temporal analysis of the joint <i>Swift</i>/BAT-<i>Fermi</i>/GBM GRB sample

Francisco J. Virgili, Ying Qin, Bing Zhang and Enwei Liang

in Monthly Notices of the Royal Astronomical Society

Published on behalf of The Royal Astronomical Society

Volume 424, issue 4, pages 2821-2831
Published in print August 2012 | ISSN: 0035-8711
Published online August 2012 | e-ISSN: 1365-2966 | DOI: http://dx.doi.org/10.1111/j.1365-2966.2012.21411.x
Spectral and temporal analysis of the joint Swift/BAT-Fermi/GBM
GRB sample

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ABSTRACT

Using the gamma-ray bursts (GRBs) simultaneously detected by Swift/Burst Alert Telescope (BAT) and Fermi/Gamma-ray Burst Monitor (GBM), we performed a joint spectral and temporal analysis of the prompt emission data and confirmed the rough correlation between the BAT-band photon index Γ;BAT and the peak spectral energy Epeak. With the redshift-known subsample, we derived the isotropic gamma-ray energy Eγ, iso and also confirmed the Eγ,isoEpeak,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.

Keywords: methods: data analysis; gamma-rays bursts: general

Journal Article.  4847 words.  Illustrated.

Subjects: Astronomy and Astrophysics

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