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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 | | Bing Zhang
; Bin-Bin Zhang
; Francisco J. Virgili
; En-Wei Liang
; D. Alexander Kann
; Xue-Feng Wu
; Daniel Proga
; Hou-Jun Lv
; Kenji Toma
; Peter Meszaros
; David N. Burrows
; Peter W. A. Roming
; Neil Gehrels
; | | Date: |
14 Feb 2009 | | 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. | | Source: | arXiv, 0902.2419 | | Services: | Forum | Review | PDF | Favorites | |
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