Zhang 2007 伽玛暴时标再分析

主要内容:
重新统计了有红移的伽玛暴的时标，包含Swift的数据，得到和以前一样的结论：分长短暴。不过长暴的时长和中间值与之前的有别。

精彩摘抄:


文章信息:
An analysis of the durations of Swift Gamma-Ray Bursts

Authors: Zhi-Bin Zhang, Chul-Sung Choi

(Submitted on 30 Aug 2007)

Abstract: We report the systematic analysis of the durations for Swift gamma-ray bursts (GRBs) and compare the results with those of pre-Swift data. For 95 GRBs with known redshift, we show that the observed durations have two lognormal distributions that are clearly divided at $T_{90}\simeq2$ s. This is consistent with the earlier BATSE results. The intrinsic durations also show a bimodal distribution but shift systematically toward the smaller value and the distribution exhibits a narrower width compared with the observed one. We find that the intrinsic distributions of long GRBs between Swift and pre-Swift are significantly different particularly in the width and the median value. In addition, the Swift data exhibit a wider duration dynamic range. Our present study also confirms the spectra of short GRBs are in general harder than the long GRBs.

arXiv:0708.4049