| GRB 081028 and its late-time afterglow re-brightening | |
Margutti, R1,2; Genet, F3; Granot, J3; Duran, RB4; Guidorzi, C2,5; Chincarini, G1,2; Mao JR(毛基荣)2,6 ; Schady, P7; Sakamoto, T8; Miller, AA9; Olofsson, G10; Bloom, JS9; Evans, PA11; Fynbo, JPU12; Malesani, D12; Moretti, A2; Pasotti, F2; Starr, D9; Burrows, DN13; Barthelmy, SD8; Roming, PWA13; Gehrels, N8; Margutti, R (reprint author), Univ Milano Bicocca, Pza Sci 3, I-20126 Milan, Italy.
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| 发表期刊 | MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
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| 2010-02-11 | |
| 卷号 | 402期号:1页码:46-64 |
| DOI | 10.1111/j.1365-2966.2009.15882.x |
| 产权排序 | 第6完成单位 |
| 收录类别 | SCI |
| 关键词 | Radiation Mechanisms: Non-thermal Gamma-rays: Bursts X-rays: Individual: Grb 081028 |
| 摘要 | Swift captured for the first time a smoothly rising X-ray re-brightening of clear non-flaring origin after the steep decay in a long gamma-ray burst (GRB): GRB 081028. A rising phase is likely present in all GRBs but is usually hidden by the prompt tail emission and constitutes the first manifestation of what is later to give rise to the shallow decay phase. Contemporaneous optical observations reveal a rapid evolution of the injection frequency of a fast cooling synchrotron spectrum through the optical band, which disfavours the afterglow onset (start of the forward shock emission along our line of sight when the outflow is decelerated) as the origin of the observed re-brightening. We investigate alternative scenarios and find that the observations are consistent with the predictions for a narrow jet viewed off-axis. The high on-axis energy budget implied by this interpretation suggests different physical origins of the prompt and (late) afterglow emission. Strong spectral softening takes place from the prompt to the steep decay phase: we track the evolution of the spectral peak energy from the gamma-rays to the X-rays and highlight the problems of the high latitude and adiabatic cooling interpretations. Notably, a softening of both the high and low spectral slopes with time is also observed. We discuss the low on-axis radiative efficiency of GRB 081028 comparing its properties against a sample of Swift long GRBs with secure E(gamma,iso) measurements. |
| 项目资助者 | Royal Society Wolfson Research Merit ; Danish National Research Foundation ; NASA [NNX09AQ66G] ; ASI [SWIFT I/011/07/0] ; Ministry of University and Research of Italy [PRIN MIUR 2007TNYZX] ; MAE ; University of Milano Bicocca (Italy) |
| 语种 | 英语 |
| 学科领域 | Astronomy & Astrophysics |
| 文章类型 | Article |
| ISSN | 0035-8711 |
| URL | 查看原文 |
| WOS记录号 | WOS:000274453500006 |
| WOS研究方向 | Astronomy & Astrophysics |
| WOS类目 | Astronomy & Astrophysics |
| 关键词[WOS] | GAMMA-RAY BURST ; SWIFT XRT DATA ; 28 FEBRUARY 1997 ; LIGHT CURVES ; E-P,E-I-E-ISO CORRELATION ; THEORETICAL IMPLICATIONS ; LUMINOSITY CORRELATION ; COMPREHENSIVE ANALYSIS ; SPECTRAL EVOLUTION ; REFRESHED SHOCKS |
| 引用统计 | |
| 文献类型 | 期刊论文 |
| 条目标识符 | http://ir.ynao.ac.cn/handle/114a53/4997 |
| 专题 | 高能天体物理研究组 |
| 通讯作者 | Margutti, R (reprint author), Univ Milano Bicocca, Pza Sci 3, I-20126 Milan, Italy. |
| 作者单位 | 1.Università degli studi Milano Bicocca, P.za della Scienza 3, Milano 20126, Italy 2.INAF Osservatorio Astronomico di Brera, via Bianchi 46, Merate 23807, Italy 3.Centre for Astrophysics Research, University of Hertfordshire, Hatfield AL10 9AB 4.Department of Physics, University of Texas at Austin, Austin, TX 78712, USA 5.Dipartimento di Fisica, Università di Ferrara, via Saragat 1, 44100 Ferrara, Italy 6.Yunnan Observatory, Chinese Academy of Sciences, PO Box 110, Kunming, Yunnan Province 650011, China 7.The UCL Mullard Space Science Laboratory, Holmbury St Mary, Dorking, Surrey RH5 6NT 8.NASA Goddard Space Flight Center, Greenbelt, MD 20771, USA 9.Department of Astronomy, University of California, Berkeley, CA 94720-3411, USA 10.Stockholm Observatory, Stockholm University, Astronomy Department AlbaNova Research Center, 106 91 Stockholm, Sweden 11.X-ray and Observational Astronomy Group, Department of Physics and Astronomy, University of Leicester, Leicester LE1 7RH 12.Dark Cosmology Centre, Niels Bohr Institute, University of Cøpenhagen, Juliane MariesVej 30, 2100 Copenhagen O, Denmark 13.Department of Astronomy and Astrophysics, Pennsylvania State University, 525 Davey Lab, University Park, PA 16802, USA |
| 推荐引用方式 GB/T 7714 | Margutti, R,Genet, F,Granot, J,et al. GRB 081028 and its late-time afterglow re-brightening[J]. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,2010,402(1):46-64. |
| APA | Margutti, R.,Genet, F.,Granot, J.,Duran, RB.,Guidorzi, C.,...&Margutti, R .(2010).GRB 081028 and its late-time afterglow re-brightening.MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,402(1),46-64. |
| MLA | Margutti, R,et al."GRB 081028 and its late-time afterglow re-brightening".MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 402.1(2010):46-64. |
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