Indication of Two Classes in the Swift Short Gamma-Ray Bursts from the XRT X-Ray Afterglow Light Curves

被引：0
作者：
Sakamoto, T. [1 ,2 ]
Gehrels, N. [3 ]
机构：
[1] CRESST, NASA, Goddard Space Flight Ctr, Greenbelt, MD 20771 USA
[2] Univ Maryland, Joint Ctr Astrophys, Baltimore, MD 21250 USA
[3] NASA, Goddard Space Flight Ctr, Greenbelt, MD 20771 USA
来源：
GAMMA-RAY BUSTS | 2009年 / 1133卷
关键词：
gamma ray: bursts; GALAXY;
D O I：
暂无
中图分类号：
P1 [天文学];
学科分类号：
0704 ;
摘要：
We 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 10(4) 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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页码：112 / +
页数：2
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