DISCOVERY OF AN EXTRA HARD SPECTRAL COMPONENT IN THE HIGH-ENERGY AFTERGLOW EMISSION OF GRB 130427A

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	DISCOVERY OF AN EXTRA HARD SPECTRAL COMPONENT IN THE HIGH-ENERGY AFTERGLOW EMISSION OF GRB 130427A
	Tam, Pak-Hin Thomas 1,2; Tang, Qing-Wen 3,4; Hou, Shu-Jin 5,6,7; Liu, Ruo-Yu 3,4,8; Wang, Xiang-Yu 3,4
刊名	ASTROPHYSICAL JOURNAL LETTERS
	2013-07-01
卷号	771 期号:1 页码:5PP
关键词	gamma-ray burst: individual (GRB 130427A) radiation mechanisms: non-thermal
ISSN号	2041-8205
通讯作者	Tam, PHT (reprint author), Natl Tsing Hua Univ, Inst Astron, Hsinchu 30013, Taiwan. Email: phtam@phys.nthu.edu.tw ; xywang@nju.edu.cn
英文摘要	The extended high-energy gamma-ray (> 100 MeV) emission which occurs after prompt gamma-ray bursts (GRBs) is usually characterized by a single power-law spectrum, which has been explained as the afterglow synchrotron radiation. The afterglow inverse Compton emission has long been predicted to be able to produce a high-energy component as well, but previous observations have not clearly revealed such a signature, probably due to the small number of > 10 GeV photons even for the brightest GRBs known so far. In this Letter, we report on the Fermi Large Area Telescope observations of the > 100 MeV emission from the very bright and nearby GRB130427A. We characterize the time-resolved spectra of the GeV emission from the GRB onset to the afterglow phase. By performing time-resolved spectral fits of GRB130427A, we found strong evidence of an extra hard spectral component that exists in the extended high-energy emission of this GRB. We argue that this hard component may arise from the afterglow inverse Compton emission.
学科主题	Astronomy & Astrophysics
WOS标题词	Science & Technology ; Physical Sciences
类目[WOS]	Astronomy & Astrophysics
研究领域[WOS]	Astronomy & Astrophysics
关键词[WOS]	GAMMA-RAY BURSTS ; LARGE-AREA TELESCOPE ; FERMI ; ACCELERATION
收录类别	SCI
语种	英语
WOS记录号	WOS:000320811300013
公开日期	2014-01-08
内容类型	期刊论文
源URL	[http://libir.pmo.ac.cn/handle/332002/9765]
专题	紫金山天文台_暗物质和空间天文实验室
作者单位	1.Natl Tsing Hua Univ, Inst Astron, Hsinchu 30013, Taiwan 2.Natl Tsing Hua Univ, Dept Phys, Hsinchu 30013, Taiwan 3.Nanjing Univ, Sch Astron & Space Sci, Nanjing 210093, Jiangsu, Peoples R China 4.Nanjing Univ, Minist Educ, Key Lab Modern Astron & Astrophys, Nanjing 210093, Jiangsu, Peoples R China 5.Xiamen Univ, Dept Astron, Xiamen 361005, Fujian, Peoples R China 6.Xiamen Univ, Inst Theoret Phys & Astrophys, Xiamen 361005, Fujian, Peoples R China 7.Chinese Acad Sci, Purple Mt Observ, Nanjing 210008, Peoples R China 8.Max Planck Inst Kernphys, D-69117 Heidelberg, Germany
推荐引用方式 GB/T 7714	Tam, Pak-Hin Thomas,Tang, Qing-Wen,Hou, Shu-Jin,et al. DISCOVERY OF AN EXTRA HARD SPECTRAL COMPONENT IN THE HIGH-ENERGY AFTERGLOW EMISSION OF GRB 130427A[J]. ASTROPHYSICAL JOURNAL LETTERS,2013,771(1):5PP.
APA	Tam, Pak-Hin Thomas,Tang, Qing-Wen,Hou, Shu-Jin,Liu, Ruo-Yu,&Wang, Xiang-Yu.(2013).DISCOVERY OF AN EXTRA HARD SPECTRAL COMPONENT IN THE HIGH-ENERGY AFTERGLOW EMISSION OF GRB 130427A.ASTROPHYSICAL JOURNAL LETTERS,771(1),5PP.
MLA	Tam, Pak-Hin Thomas,et al."DISCOVERY OF AN EXTRA HARD SPECTRAL COMPONENT IN THE HIGH-ENERGY AFTERGLOW EMISSION OF GRB 130427A".ASTROPHYSICAL JOURNAL LETTERS 771.1(2013):5PP.