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首页> 外文期刊>The Astrophysical Journal. Supplement Series >The second Swift Burst Alert Telescope gamma-ray burst catalog
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The second Swift Burst Alert Telescope gamma-ray burst catalog

机译：第二个Swift Burst Alert Telescope伽玛射线爆裂目录

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We present the second Swift Burst Alert Telescope (BAT) catalog of gamma-ray bursts (GRBs), which contains 476 bursts detected by the BAT between 2004 December 19 and 2009 December 21. This catalog (hereafter the BAT2 catalog) presents burst trigger time, location, 90% error radius, duration, fluence, peak flux, time-averaged spectral parameters, and time-resolved spectral parameters measured by the BAT. In the correlation study of various observed parameters extracted from the BAT prompt emission data, we distinguish among long-duration GRBs (L-GRBs), short-duration GRBs (S-GRBs), and short-duration GRBs with extended emission (S-GRBs with E.E.) to investigate differences in the prompt emission properties. The fraction of L-GRBs, S-GRBs, and S-GRBs with E.E. in the catalog are 89%, 8%, and 2%, respectively. We compare the BAT prompt emission properties with the BATSE, BeppoSAX, and HETE-2 GRB samples. We also correlate the observed prompt emission properties with the redshifts for the GRBs with known redshift. The BAT T_(90) and T_(50) durations peak at 70 s and 30 s, respectively. We confirm that the spectra of the BAT S-GRBs are generally harder than those of the L-GRBs. The time-averaged spectra of the BAT S-GRBs with E.E. are similar to those of the L-GRBs. Whereas, the spectra of the initial short spikes of the S-GRBs with E.E. are similar to those of the S-GRBs. We show that the BAT GRB samples are significantly softer than the BATSE bright GRBs and that the time-averaged E~(obs)_(peak) of the BAT GRBs peaks at 80keV, which is significantly lower energy than those of the BATSE sample, which peak at 320keV. The time-averaged spectral properties of the BAT GRB sample are similar to those of the HETE-2 GRB samples. By time-resolved spectral analysis, we find that only 10% of the BAT observed photon indices are outside the allowed region of the synchrotron shock model. We see no obvious observed trend in the BAT T_(90) and the observed spectra with redshifts. The T_(90) and T_(50) distributions measured at the 140-220keV band in the GRB rest frame from the BAT known redshift GRBs peak at 19 s and 8 s, respectively. We also provide an update on the status of the on-orbit BAT calibrations.
机译：我们介绍了第二个伽马射线暴（GRB）的Swift Burst Alert Telescope（BAT）目录，其中包含BAT在2004年12月19日至2009年12月21日之间检测到的476个突发。该目录（以下称BAT2目录）提供了猝发触发时间。 ，位置，90％的误差半径，持续时间，注量，峰值通量，时间平均光谱参数和BAT测量的时间分辨光谱参数。在从BAT即时排放数据中提取的各种观测参数的相关性研究中，我们区分了长持续时间GRB（L-GRB），短持续时间GRB（S-GRB）和短时扩展排放GRB（S-带有EE的GRB）以调查即时排放属性的差异。具有E.E.的L-GRB，S-GRB和S-GRB的比例分别为89％，8％和2％。我们将BAT即时发射特性与BATSE，BeppoSAX和HETE-2 GRB样本进行了比较。我们还将观察到的即时发射特性与已知红移的GRB的红移相关联。 BAT T_（90）和T_（50）持续时间分别在70 s和30 s达到峰值。我们确认，BAT S-GRB的光谱通常比L-GRB的光谱更硬。具有E.E.的BAT S-GRB的时间平均光谱与L-GRB的时间平均光谱相似。然而，具有E.E.的S-GRB的初始短尖峰的光谱类似于S-GRB的那些。我们发现BAT GRB样本比BATSE亮GRB显着软，并且BAT GRB的时间平均E〜（obs）_（peak）峰值在80keV，这比BATSE样本的能量低很多，在320keV达到峰值。 BAT GRB样品的时均光谱特性与HETE-2 GRB样品的时均光谱特性相似。通过时间分辨光谱分析，我们发现BAT观测到的光子指数中只有10％在同步加速器激波模型的允许区域之外。我们在BAT T_（90）上没有观察到明显的趋势，在观察到的光谱中却出现了红移。从BAT已知的红移GRB分别在19 s和8 s的峰值处，在GRB静止帧的140-220keV频带处测得的T_（90）和T_（50）分布。我们还提供在轨BAT校准状态的更新。

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