IMPLICATIONS OF UNDERSTANDING SHORT GAMMA-RAY BURSTS DETECTED BY SWIFT
IMPLICATIONS OF UNDERSTANDING SHORT GAMMA-RAY BURSTS DETECTED BY SWIFT
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DOI：
10.1088/0004-673x/738/1/19
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发表时间：
2011-04
期刊：
影响因子：
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通讯作者：
L. Shao;Z. Dai;Yizhong Fan;Fu-Wen Zhang;Z. Jin;D. Wei
中科院分区：
文献类型：
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作者：
L. Shao;Z. Dai;Yizhong Fan;Fu-Wen Zhang;Z. Jin;D. Wei
为了解决伽玛射线暴分类的难题，我们对雨燕伽玛暴进行了系统的研究，并探讨了几个短伽玛暴问题。虽然短伽玛暴的瞬发持续时间很短（10.2秒），但由暴发警报望远镜观测到的包括瞬发和余辉发射的复合光变曲线表明，大多数短伽玛暴具有与长伽玛暴相似的辐射特征。此外，一些研究充分的短伽玛暴也可能具有内在的长瞬发持续时间，这使得它们成为一种短伽玛暴的冒名顶替者。Swift探测到的真正的短伽玛暴可能很罕见，因此确定观测到的短伽玛暴并不令人惊讶，很麻烦。特别是，在伽玛暴的宿主识别和红移测量中的观测偏差应该非常谨慎。红移分布，这已被发现是不同的长和短的伽玛暴，可能有很大的影响的测量方法。我们发现，从假定的宿主星系的长和短的伽玛暴测量的红移似乎有一个类似的分布。
In an effort to understand the puzzle of classifying gamma-ray bursts (GRBs), we perform a systematic study of Swift GRBs and investigate several short GRB issues. Though short GRBs have a short (≲ 2 s) prompt duration as monitored by the Burst Alert Telescope, the composite light curves including both the prompt and afterglow emission suggest that most of the short GRBs have a similar radiative feature to long GRBs. Furthermore, some well-studied short GRBs might also have an intrinsically long prompt duration, which renders them as a type of short GRB imposters. Genuine short GRBs detected by Swift might be rare, so determining 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 found to be different for long and short GRBs, might have been strongly affected by the measurement methods. We find that the redshifts measured from the presumed host galaxies of long and short GRBs appear to have a similar distribution.