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arXiv 2204.07587astro-ph.HE
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GRB 210204 A的长活动余辉:伽马射线暴中最延迟耀斑的探测

The long-active afterglow of GRB 210204A: Detection of the most delayed flares in a Gamma-Ray Burst

Harsh Kumar, Rahul Gupta, Divita Saraogi, Tomás Ahumada, Igor Andreoni, G. C. Anupama, Amar Aryan, Sudhanshu Barway, Varun Bhalerao, Poonam Chandra, Michael W. … 展开作者

Harsh Kumar, Rahul Gupta, Divita Saraogi, Tomás Ahumada, Igor Andreoni, G. C. Anupama, Amar Aryan, Sudhanshu Barway, Varun Bhalerao, Poonam Chandra, Michael W. Coughlin, Dimple, Anirban Dutta, Ankur Ghosh, Anna Y. Q. Ho, E. C. Kool, Amit Kumar, Michael S. Medford, Kuntal Misra, Shashi B. Pandey, Daniel A. Perley, Reed Riddle, Amit Kumar Ror, Jason M. Setiadi, Yuhan Yao

摘要:

我们目前的结果,从广泛的宽带后续的GRB 210204A在30天的时间。我们在爆发后7.6 x 10^5 s和1.1 x 10^6 s的余辉中探测到光学耀斑:这是迄今为止在伽马射线暴余辉中探测到的延迟最长的耀斑。在源红移为0.876时,静止帧延迟为5.8 x 10^5 s(6.71 d)。我们调查了这种燃烧的可能原因,并得出结论,最有可能的原因是在射流中的刷新冲击。伽玛暴的瞬发在典型长暴的范围内,它显示了三个不相交的发射事件,它们都遵循典型的伽玛暴关联。这表明GRB 210204A可能没有任何特殊的属性,导致后期耀斑,缺乏对其他余辉的检测可能是由于缺乏后期观测。对较大样本的伽玛暴进行系统的后期跟踪可以更清楚地了解这种余辉行为。对GRB 210204A的进一步分析表明,光变曲线中的晚期隆起不太可能是由于红移(z)= 0.876的SNe,而更可能是由于晚期的耀斑活动。这种变化的原因是不清楚的量化,由于缺乏多波段数据在后期的恶劣天气条件的限制。GRB 210204A的耀斑是迄今为止探测到的最新耀斑。

英文摘要:

We present results from extensive broadband follow-up of GRB 210204A over the period of thirty days. We detect optical flares in the afterglow at 7.6 x 10^5 s and 1.1 x 10^6 s after the burst: the most delayed flaring ever detected in a GRB afterglow. At the source redshift of 0.876, the rest-frame delay is 5.8 x 10^5 s (6.71 d). We investigate possible causes for this flaring and conclude that the most likely cause is a refreshed shock in the jet. The prompt emission of the GRB is within the range of typical long bursts: it shows three disjoint emission episodes, which all follow the typical GRB correlations. This suggests that GRB 210204A might not have any special properties that caused late-time flaring, and the lack of such detections for other afterglows might be resulting from the paucity of late-time observations. Systematic late-time follow-up of a larger sample of GRBs can shed more light on such afterglow behaviour. Further analysis of the GRB 210204A shows that the late time bump in the light curve is highly unlikely due to underlying SNe at redshift (z) = 0.876 and is more likely due to the late time flaring activity. The cause of this variability is not clearly quantifiable due to the lack of multi-band data at late time constraints by the bad weather conditions. The flare of GRB 210204A is the latest flare detected to date.

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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