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A CORRELATED STUDY OF OPTICAL AND X-RAY AFTERGLOWS OF GRBs
Li, Liang1,2,3; Wu, Xue-Feng4,5,6,7; Huang, Yong-Feng8,9; Wang, Xiang-Gao10,11; Tang, Qing-Wen8,9; Liang, Yun-Feng12; Zhang, Bin-Bin13; Wang, Yu14,15,16; Geng, Jin-Jun8,9; Liang, En-Wei10; Wei, Jian-Yan17; Zhang, Bing11; Ryde, Felix1,2
2015-05-20
Source PublicationASTROPHYSICAL JOURNAL
Volume805Issue:1Pages:13
AbstractWe study an extensive sample of 87 gamma-ray bursts (GRBs) for which there are well-sampled and simultaneous optical and X-ray light curves. We extract the cleanest possible signal of the afterglow component. and compare the temporal behaviors of the X-ray light. curve, observed by Swift XRT, and optical data, observed by UVOT and ground-based telescopes for each individual burst. Overall we find that 62% of the GRBs. are consistent with the standard afterglow model. When more advanced modeling is invoked, up to 91% of the bursts in our sample may be consistent with the external-shock model. A large fraction of these bursts are consistent with occurring in a constant interstellar density medium (61%) while only 39% of them occur in a wind-like medium. Only nine cases have afterglow light curves that exactly match the standard fireball model prediction, having a single power-law decay in both energy bands that are observed during their entire duration. In particular, for the bursts with chromatic behavior, additional model assumptions must be made over limited segments of the light curves in order for these bursts to fully agree with the external-shock model. Interestingly, for 54% of the X-ray and 40% of the optical band observations, the end of the shallow decay (t(similar to-0.5)) period coincides with the jet-break (t(similar to-p)) time, causing an abrupt change in decay slope. The fraction of the burst that is consistent with the external-shock model is independent of the observational epochs in the rest frame of GRBs. Moreover, no cases can be explained by the cooling frequency crossing the X-ray or optical band.
KeywordMethods: Statistical Reference Systems X-rays: Ism
Subject Area天文和天体物理
WOS HeadingsScience & Technology ; Physical Sciences
DOI10.1088/0004-637X/805/1/13
WOS KeywordSWIFT XRT DATA ; CONTINUOUS ENERGY INJECTION ; BAND SPECTRAL EVOLUTION ; LIGHT-CURVE BREAKS ; BURST AFTERGLOWS ; EARLY-TIME ; COMPREHENSIVE ANALYSIS ; MILLISECOND PULSARS ; PROMPT EMISSION ; JET BREAK
Indexed BySCI
Language英语
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS IDWOS:000354991300013
Citation statistics
Document Type期刊论文
Identifierhttp://libir.pmo.ac.cn/handle/332002/14885
Collection南极天文中心
Affiliation1.KTH Royal Inst Technol, Dept Phys, SE-10691 Stockholm, Sweden
2.Oskar Klein Ctr Cosmoparticle Phys, Stockholm, Sweden
3.Stockholm Univ, Dept Phys, SE-10691 Stockholm, Sweden
4.Chinese Acad Sci, Chinese Ctr Antarctic Astron, Nanjing 210008, Jiangsu, Peoples R China
5.Purple Mt Observ, Joint Ctr Particle Nucl Phys, Nanjing 210008, Jiangsu, Peoples R China
6.Nanjing Univ, Nanjing 210008, Jiangsu, Peoples R China
7.Chinese Acad Sci, Purple Mt Observ, Key Lab Dark Matter & Space Astron, Nanjing 210008, Jiangsu, Peoples R China
8.Nanjing Univ, Dept Astron, Nanjing 210093, Jiangsu, Peoples R China
9.Nanjing Univ, Minist Educ, Key Lab Modern Astron & Astrophys, Nanjing 210093, Jiangsu, Peoples R China
10.Guangxi Univ, Dept Phys, Ctr Astrophys & Space Sci, GXU NAOC, Nanjing 530004, Jiangsu, Peoples R China
11.Univ Nevada, Dept Phys & Astron, Las Vegas, NV 89154 USA
12.Chinese Acad Sci, Purple Mt Observ, Nanjing 210008, Jiangsu, Peoples R China
13.Univ Alabama, CSPAR, Huntsville, AL 35899 USA
14.Univ Roma La Sapienza, Dipartimento Fis, I-00185 Rome, Italy
15.Univ Roma La Sapienza, ICRA, I-00185 Rome, Italy
16.ICRANet, I-65122 Pescara, Italy
17.Chinese Acad Sci, Natl Astron Observ, Beijing 100012, Peoples R China
Recommended Citation
GB/T 7714
Li, Liang,Wu, Xue-Feng,Huang, Yong-Feng,et al. A CORRELATED STUDY OF OPTICAL AND X-RAY AFTERGLOWS OF GRBs[J]. ASTROPHYSICAL JOURNAL,2015,805(1):13.
APA Li, Liang.,Wu, Xue-Feng.,Huang, Yong-Feng.,Wang, Xiang-Gao.,Tang, Qing-Wen.,...&Ryde, Felix.(2015).A CORRELATED STUDY OF OPTICAL AND X-RAY AFTERGLOWS OF GRBs.ASTROPHYSICAL JOURNAL,805(1),13.
MLA Li, Liang,et al."A CORRELATED STUDY OF OPTICAL AND X-RAY AFTERGLOWS OF GRBs".ASTROPHYSICAL JOURNAL 805.1(2015):13.
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