Sakamoto 2009 短暴的两类X-ray余辉

主要内容:
一类类似长暴的余辉，一类的余辉持续时间比较短

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Title:
Indication of Two Classes in the Swift Short Gamma-Ray Bursts from the XRT X-Ray Afterglow Light Curves
Authors:
Sakamoto, T.; Gehrels, N.
Publication:
eprint arXiv:0901.4920
Publication Date:
01/2009
Origin:
ARXIV
Keywords:
Astrophysics - High Energy Astrophysical Phenomena
Comment:
3 pages, 6 figures, Submitted to Proceedings of Huntsville 2008 Symposium on GRBs
Bibliographic Code:
2009arXiv0901.4920S
AbstractWe present the discovery of two distinct classes in the Swift short duration gamma-ray bursts (S-GRBs) from the X-Ray Telescope (XRT) X-ray afterglow light curve. We find that about 40% of the Swift S-GRBs have an X-ray afterglow light curves which only lasts less than 10000 seconds after the burst trigger (hereafter short-lived S-GRBs). On the other hand, another 60% of S-GRBs have a long lasting X-ray afterglow light curve which resembles the long duration gamma-ray bursts. We also find that none of the short-lived S-GRBs shows the extended emission in the Burst Alert Telescope (BAT) energy range. We compare the burst properties for both the prompt emission and the afterglow, and discuss the possibility of different progenitors for the Swift short GRBs.
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