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DISCOVERY OF AN EXTRA HARD SPECTRAL COMPONENT IN THE HIGH-ENERGY AFTERGLOW EMISSION OF GRB 130427A
Tam, Pak-Hin Thomas1,2; Tang, Qing-Wen3,4; Hou, Shu-Jin5,6,7; Liu, Ruo-Yu3,4,8; Wang, Xiang-Yu3,4
2013-07-01
Source PublicationASTROPHYSICAL JOURNAL LETTERS
ISSN2041-8205
Volume771Issue:1Pages:5PP
Corresponding AuthorTam, PHT (reprint author), Natl Tsing Hua Univ, Inst Astron, Hsinchu 30013, Taiwan. Email: phtam@phys.nthu.edu.tw ; xywang@nju.edu.cn
AbstractThe 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.
KeywordGamma-ray Burst: Individual (Grb 130427a) Radiation Mechanisms: Non-thermal
Subject AreaAstronomy & Astrophysics
WOS HeadingsScience & Technology ; Physical Sciences
DOI10.1088/2041-8205/771/1/L13
WOS KeywordGAMMA-RAY BURSTS ; LARGE-AREA TELESCOPE ; FERMI ; ACCELERATION
Indexed BySCI
Language英语
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS IDWOS:000320811300013
Citation statistics
Cited Times:32[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://libir.pmo.ac.cn/handle/332002/9765
Collection暗物质和空间天文实验室
Affiliation1.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
Recommended Citation
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.
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