arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1904.04550astro-ph.HE
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我们能快速标记超长伽马射线暴吗?

Can we quickly flag Ultra-long Gamma-Ray Bursts?

B. Gendre, Q. T. Joyce, N. B. Orange, G. Stratta, J. L. Atteia, M. Boer

摘要:

超长伽马射线暴是一类持续数小时的高能瞬变现象。它们的确切性质仍然是难以捉摸的,已经提出了几个模型来解释它们。由于宽场伽玛射线探测器的探测范围有限,利用灵敏的窄场X射线仪器研究其瞬发相有助于理解超长伽玛暴的起源。然而,由于在瞬发阶段结束之前识别超长GRB具有挑战性,因此观察员在快速启动后续观测方面面临着一个真正的问题。在这里,我们提出了一个比较的提示属性后,几十分钟的样本的超长伽玛暴和正常的长伽玛暴,寻找以前的指标的长持续时间。我们发现,没有这样明确的事先指标的持续时间的爆发。我们还发现,统计上,持续至少10分钟和20分钟的爆发分别有28%和50%的概率是超长事件。这些发现指向一个共同的中央引擎正常的长和超长的伽玛暴,与Eksar模型的特权。

英文摘要:

Ultra-long Gamma-Ray Bursts are a class of high energy transients lasting several hours. Their exact nature is still elusive, and several models have been proposed to explain them. Because of the limited coverage of wide field gamma-ray detectors, the study of their prompt phase with sensitive narrow-field X-ray instruments could help in understanding the origin of ultra-long GRBs. However, the observers face a true problem in rapidly activating follow-up observations, due to the challenging identification of an ultra-long GRB before the end of the prompt phase. We present here a comparison of the prompt properties available after a few tens of minutes of a sample of ultra-long GRBs and normal long GRBs, looking for prior indicators of the long duration. We find that there is no such clear prior indicator of the duration of the burst. We also found that statistically, a burst lasting at least 10 and 20 minutes has respectively 28% and 50% probability to be an ultralong event. These findings point towards a common central engine for normal long and ultra-long GRBs, with the collapsar model privileged.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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