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arXiv 2301.02407astro-ph.HE
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在 GRB 220101A 中探测到绝对 AB 星等为 -39.4 的光学-紫外耀斑

An optical-ultraviolet flare with absolute AB magnitude of -39.4 detected in GRB 220101A

Zhi-Ping Jin, Hao Zhou, Yun Wang, Jin-Jun Geng, Stefano Covino, Xue-Feng Wu, Xiang Li, Yi-Zhong Fan, Da-Ming Wei, Jian-Yan Wei

AI总结:

基于 Swift/UVOT 饱和源测光新方法,对红移 4.618 的 GRB 220101A 初始 150 秒曝光进行时间分辨分析,探测到绝对 AB 星等 -39.4 的快速演化光学-紫外耀斑,揭示其源于更新激波而非内/反向激波,证明早期高时间分辨率观测的必要性。

摘要:

在伽马射线暴中已探测到超亮光学-紫外耀斑,其光度记录由肉眼可见事件 GRB 080319B 保持。此类耀斑通常被归因于内部激波或外部反向激波辐射。在此,借助一种新开发的方法,我们从 Swift/UVOT 的饱和源中提取了可靠的光度测量,对 GRB 220101A(红移为 4.618 的暴发)初始白光波段 150 秒曝光进行了时间分辨分析,并报告了一个快速演化、绝对 AB 星等高达 -39.4$\pm$0.2 的光学-紫外耀斑。与 GRB 080319B 不同,该新耀斑的时间行为并不追踪伽马射线活动。该极高能光学-紫外耀斑既非源于内部激波也非反向激波,而极可能源于晚喷出的极高能物质追上早先发射的减速外流所引发的更新激波。这一发现揭示了极高能光学-紫外耀斑起源的多样性,并证明了早期高时间分辨率观测的必要性。

英文摘要:

Hyperluminous optical-ultraviolet fares have been detected in gamma-ray bursts and the luminosity record was held by naked-eye event GRB 080319B. Such fares are widely attributed to internal shock or external reverse shock radiation. Here, with a new method developed to derive reliable photometry from saturated sources of Swift/UVOT, we carry out time-resolved analysis of the initial white-band 150s exposure of GRB 220101A, a burst at a redshift of 4.618, and report a rapidly evolving optical-ultraviolet fare with a high absolute AB magnitude of -39.4$\pm$0.2. In contrast to GRB 080319B, the temporal behaviour of this new fare does not trace the gamma-ray activity. Instead of either internal shocks or reverse shock, this extremely energetic optical-ultraviolet fare is most likely to originate from the refreshed shocks induced by the late-ejected extremely energetic material catching up with the earlier-launched decelerating outflow. This finding reveals the diverse origins of the extremely energetic optical-ultraviolet fares and demonstrates the necessity of high-time-resolution observations at early times.

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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