Virgili, Francisco 2011 Swift/BAT-Fermi/GBM的谱的联合分析

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可以得到新的E_p和谱指数等。

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Title:		Spectral and temporal analysis of the joint Swift/BAT-Fermi/GBM GRB sample
Authors:		Virgili, Francisco; Qin, Ying; Zhang, Bing; Liang, Enwei
Publication:		eprint arXiv:1112.4363
Publication Date:		12/2011
Origin:		ARXIV
Keywords:		Astrophysics - High Energy Astrophysical Phenomena
Comment:		17 pages, 8 figures, 3 tables, MNRAS submitted
Bibliographic Code:		2011arXiv1112.4363V

Abstract

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.

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