Zhang 2009 GRB 080913的观测以及Type I/II的分类

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再次强调他的根据是否有超新星成分等来分类Type I/II

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Title:		Physical classification scheme of cosmological Gamma-ray bursts and their observational characteristics: on the nature of z=6.7 GRB 080913 and some short/hard GRBs
Authors:		Zhang, Bing; Zhang, Bin-Bin; Virgili, Francisco J.; Liang, En-Wei; Kann, D. Alexander; Wu, Xue-Feng; Proga, Daniel; Lv, Hou-Jun; Toma, Kenji; Meszaros, Peter; Burrows, David N.; Roming, Peter W. A.; Gehrels, Neil
Publication:		eprint arXiv:0902.2419
Publication Date:		02/2009
Origin:		ARXIV
Keywords:		Astrophysics - High Energy Astrophysical Phenomena
Comment:		29 pages, submitted to ApJ
Bibliographic Code:		2009arXiv0902.2419Z

Abstract

(Abridged) The highest redshift (z=6.7) gamma-ray burst (GRB) 080913 recently detected by Swift is an intrinsically short, hard GRB. It would be recognized by BATSE as a short/hard GRB should it have occurred at z \leq 1. We perform a more thorough investigation on the physical classification scheme of cosmological GRBs and their observational characteristics. We reiterate the physical definitions of Type I/II GRBs and then review the observational criteria and their physical motivations. Contrary to the traditional approach of assigning the physical category based on the gamma-ray properties (duration, hardness, and spectral lag), we take the opposite approach to define the Type I and Type II Gold Samples using several criteria that are more directly related to the GRB progenitors and study the properties of the two Gold Samples and compare them with the traditional long/soft and short/hard samples. We find that the Type II Gold Sample reasonably tracks the long/soft population, although it includes several intrinsically short (shorter than 1s in the rest frame) GRBs. The Type I Gold Sample only has 5 GRBs, 4 of which are not strictly short but have extended emission. Other short/hard GRBs detected in the Swift era represent the BATSE short/hard sample well, but it is unclear whether all of them belong to Type I. We suspect that some high-luminosity short/hard GRBs may instead belong to Type II. We suggest that GRB 080913 is more likely a Type II event, although a Type I origin invoking a BH-NS merger is not ruled out. We re-emphasize the importance of invoking multiple observational criteria, and cautiously propose an operational procedure to determine the physical category of a particular GRB, with all the caveats laid out.

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