AN INVERSE COMPTON ORIGIN FOR THE 55 GeV PHOTON IN THE LATE AFTERGLOW OF GRB 130907A

被引：7
作者：
Tang, Qing-Wen [1 ,2 ]
Tam, Pak-Hin Thomas [3 ,4 ]
Wang, Xiang-Yu [1 ,2 ]
机构：
[1] Nanjing Univ, Sch Astron & Space Sci, Nanjing 210093, Jiangsu, Peoples R China
[2] Nanjing Univ, Minist Educ, Key Lab Modern Astron & Astrophys, Nanjing 210093, Jiangsu, Peoples R China
[3] Natl Tsing Hua Univ, Inst Astron, Hsinchu 30013, Taiwan
[4] Natl Tsing Hua Univ, Dept Phys, Hsinchu 30013, Taiwan
来源：
ASTROPHYSICAL JOURNAL | 2014年 / 788卷 / 02期
关键词：
gamma-ray burst: individual (GRB 130907A); radiation mechanisms: non-thermal; GAMMA-RAY BURST; HIGH-ENERGY EMISSION; VERY-HIGH-ENERGY; LIGHT CURVES; 130427A; SYNCHROTRON; FERMI; ACCELERATION; RADIATION; MODEL;
D O I：
10.1088/0004-637X/788/2/156
中图分类号：
P1 [天文学];
学科分类号：
0704 ;
摘要：
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.
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页数：5
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