Shao 2011 某些短暴可能实际上是长暴

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Title:		Implications for Understanding Short Gamma-Ray Bursts Detected by {\it Swift}
Authors:		Shao, Lang; Dai, Zi-Gao; Fan, Yi-Zhong; Zhang, Fu-Wen; Jin, Zhi-Ping; Wei, Da-Ming
Publication:		eprint arXiv:1104.5498
Publication Date:		04/2011
Origin:		ARXIV
Keywords:		Astrophysics - High Energy Astrophysical Phenomena, Astrophysics - Cosmology and Extragalactic Astrophysics
Comment:		10 pages, 5 figues, 2 tables
Bibliographic Code:		2011arXiv1104.5498S

Abstract

In an effort to understand the puzzle of classifying Gamma-Ray Bursts (GRBs), we have a systematic study of {\it Swift} GRBs and investigate several issues on short GRBs. Though short GRBs have a short ($\lesssim2$ s) prompt duration as monitored by {\it Swift} Burst Alert Telescope (BAT), the composite light curves including both the prompt and afterglow emission suggest that most of them have a similar radiative feature as the long GRBs. Besides, some well-studied short GRBs might also have an intrinsically long prompt duration, which renders them a type of short GRB imposters. Genuine short GRBs might be rare so that to discriminate the observed short GRBs is, not surprisingly, troublesome. In particular, the observational biases in the host identification and redshift measurement of GRBs should be taken with great caution. The redshift distribution which has been proposed to be different for long and short GRBs might have been strongly affected by the measurement methods.

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