AN INVERSE COMPTON ORIGIN FOR THE 55 GeV PHOTON IN THE LATE AFTERGLOW OF GRB 130907A
AN INVERSE COMPTON ORIGIN FOR THE 55 GeV PHOTON IN THE LATE AFTERGLOW OF GRB 130907A
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DOI：
10.1088/0004-637x/788/2/156
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发表时间：
2014-05
期刊：
影响因子：
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通讯作者：
Q. Tang;P. Tam;Xiang-Yu Wang
中科院分区：
文献类型：
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作者：
Q. Tang;P. Tam;Xiang-Yu Wang
在瞬发伽玛射线暴（GRB）之后很长时间内发生的高能伽玛射线（>100 MeV）辐射通常被解释为余辉同步辐射。本文分析了费米大天区望远镜对GRB 130907A的观测结果。发现一个55 GeV的光子兼容的位置的爆发后约5小时的提示阶段。这个光子与GRB 130907 A相关联的概率高于99.96%。该光子的能量超过了此时的最大同步加速器光子能量，因此它的出现挑战了作为扩展的高能量>10 GeV发射的起源的同步加速器机制。宽带光谱能量分布的建模表明，这种高能量的光子可以产生的同步自康普顿发射的余辉。
The extended high-energy gamma-ray (>100 MeV) emission which occurs well after the prompt gamma-ray bursts (GRBs) is usually explained as the afterglow synchrotron radiation. Here we report the analysis of Fermi Large Area Telescope observations of GRB 130907A. A 55 GeV photon compatible with the position of the burst was found about 5 hr after the prompt phase. The probability that this photon is associated with GRB 130907A is higher than 99.96%. The energy of this photon exceeds the maximum synchrotron photon energy at this time and its occurrence thus challenges the synchrotron mechanism as the origin for the extended high-energy >10 GeV emission. Modeling of the broadband spectral energy distribution suggests that such high energy photons can be produced by the synchrotron self-Compton emission of the afterglow.