Astronomy and Astrophysics – Astrophysics – High Energy Astrophysical Phenomena
Scientific paper
2011-12-19
Astronomy and Astrophysics
Astrophysics
High Energy Astrophysical Phenomena
17 pages, 8 figures, 3 tables, MNRAS submitted
Scientific paper
Using the gamma-ray bursts simultaneously detected by Swift/BAT and Fermi/GBM we perform a joint spectral and temporal analysis of the prompt emission data. Using derived spectral parameters, we confirm the rough correlation between the BAT-band photon index Gamma^BAT and the peak spectral energy E_peak. With the redshift known sub-sample, we derive the isotropic gamma-ray energy E_gamma,iso and confirm the E_gamma,iso - E_peak,rest relation, with a larger scatter than the Amati sample but consistent with another analysis by the GBM team. We also compare the T_90 values derived in the GBM band with those derived in the BAT band. We find that for long GRBs the BAT T_90 is usually longer than the GBM T_90, 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.
Liang Enwei
Qin Ying
Virgili Francisco
Zhang Bing
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