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THE ORIGIN OF THE PLATEAU AND LATE REBRIGHTENING IN THE AFTERGLOW OF GRB 120326A
Hou, S. J.1,2,3; Geng, J. J.4; Wang, K.4; Wu, X. F.3; Huang, Y. F.4; Dai, Z. G.4; Lu, J. F.1,2
2014-04-20
Source PublicationASTROPHYSICAL JOURNAL
ISSN0004-637X
Volume785Issue:2Pages:0
AbstractGRB 120326A is an unusual gamma-ray burst (GRB) that has a long plateau and a very late rebrightening in both X-ray and optical bands. The similar behavior of the optical and X-ray light curves suggests that they may share a common origin. The long plateau starts at several hundred seconds and ends at tens of thousands of seconds, and the peak time of the late rebrightening is about 30,000 s. We analyze the energy injection model by means of numerical and analytical solutions, considering both the wind environment and the interstellarmedium environment for GRB afterglows. We particularly study the influence of the injection starting time, ending time, stellar wind density (or density of the circumburst environment), and injection luminosity on the shape of the afterglow light curves, respectively. In the wind model, we find that the light curve is largely affected by the parameters and that there is a "bump" in the late stage. In the wind environment, we found that the longer the energy is injected, the more obvious the rebrightening will be. We also find that the peak time of the bump is determined by the stellar wind density. We use the late continuous injection model to interpret the unusual afterglow of GRB 120326A. The model fits the observational data well; however, we find that the timescale of the injection must be higher than 10,000 s, which implies that the timescale of the central engine activity must also be more than 10,000 s. This information can give useful constraints on the central engines of GRBs-we consider a newborn millisecond pulsar with a strong magnetic field to be the central engine. On the other hand, our results suggest that the circumburst environment of GRB 120326A is very likely a stellar wind.
KeywordGamma-ray Burst: Individual (Grb 120326a) Ism: Jets And Outflows Radiation Mechanisms: Non-thermal Stars: Neutron
WOS HeadingsScience & Technology ; Physical Sciences
DOI10.1088/0004-637X/785/2/113
WOS KeywordGAMMA-RAY BURSTS ; SWIFT XRT DATA ; CONTINUOUS ENERGY INJECTION ; X-RAY ; LIGHT CURVES ; COMPREHENSIVE ANALYSIS ; FIREBALL MODEL ; SHALLOW-DECAY ; RELATIVISTIC FIREBALLS ; MILLISECOND PULSARS
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Indexed BySCI
Language英语
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS IDWOS:000335736800032
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Document Type期刊论文
Identifierhttp://libir.pmo.ac.cn/handle/332002/10611
Collection南极天文中心
Affiliation1.Xiamen Univ, Dept Astron, Xiamen 361005, Fujian, Peoples R China
2.Xiamen Univ, Inst Theoret Phys & Astrophys, Xiamen 361005, Fujian, Peoples R China
3.Chinese Acad Sci, Purple Mt Observ, Nanjing 210008, Jiangsu, Peoples R China
4.Nanjing Univ, Sch Astron & Space Sci, Nanjing 210093, Jiangsu, Peoples R China
Recommended Citation
GB/T 7714
Hou, S. J.,Geng, J. J.,Wang, K.,et al. THE ORIGIN OF THE PLATEAU AND LATE REBRIGHTENING IN THE AFTERGLOW OF GRB 120326A[J]. ASTROPHYSICAL JOURNAL,2014,785(2):0.
APA Hou, S. J..,Geng, J. J..,Wang, K..,Wu, X. F..,Huang, Y. F..,...&Lu, J. F..(2014).THE ORIGIN OF THE PLATEAU AND LATE REBRIGHTENING IN THE AFTERGLOW OF GRB 120326A.ASTROPHYSICAL JOURNAL,785(2),0.
MLA Hou, S. J.,et al."THE ORIGIN OF THE PLATEAU AND LATE REBRIGHTENING IN THE AFTERGLOW OF GRB 120326A".ASTROPHYSICAL JOURNAL 785.2(2014):0.
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