GRB 240825A: Early Reverse Shock and Its Physical Implications
文献类型：期刊论文
| 作者 | Wu, Chao2,3; Wang, Yun25; Li, Hua-Li3; Xin, Li-Ping2,3; Xu, Dong3; Schneider, Benjamin35,36; de Ugarte Postigo, Antonio36; Lamb, Gavin4; Reguitti, Andrea5,6; Saccardi, Andrea7 |
| 刊名 | RESEARCH IN ASTRONOMY AND ASTROPHYSICS
 |
| 出版日期 | 2025-10-01 |
| 卷号 | 25期号:10页码:105003 |
| 关键词 | (stars:) gamma-ray burst: individual : (GRB 240825A) (stars:) gamma-ray burst: general (transient:) gamma-ray bursts |
| ISSN号 | 1674-4527 |
| DOI | 10.1088/1674-4527/adeaf0 |
| 产权排序 | 1 |
| 英文摘要 | Early multiwavelength observations offer crucial insights into the nature of the relativistic jets responsible for gamma-ray bursts and their interaction with the surrounding medium. We present data of GRB 240825A from 17 space- and ground-based telescopes/instruments, covering wavelengths from NIR/optical to X-ray and GeV, and spanning from the prompt emission to the afterglow phase triggered by Swift and Fermi. The early afterglow observations were carried out by SVOM/C-GFT, and spectroscopic observations of the afterglow by GTC, VLT, and TNG determined the redshift of the burst (z = 0.659) later. A comprehensive analysis of the prompt emission spectrum observed by Swift-BAT and Fermi-GBM/LAT reveals a rare and significant high-energy cutoff at 76 MeV. Assuming this cutoff is due to gamma gamma absorption allows us to place an upper limit on the initial Lorentz factor, Gamma(0) < 245. The optical/NIR and GeV afterglow light curves can be described by the standard external shock model, with early-time emission dominated by a reverse shock (RS) and a subsequent transition to forward shock (FS) emission. Our afterglow modeling yields a consistent estimate of the initial Lorentz factor (Gamma(0) similar to 234). Furthermore, the RS-to-FS magnetic field ratio (R-B similar to 302 ) indicates that the RS region is significantly more magnetized than the FS region. An isotropic-equivalent kinetic energy of E-k,E-iso = 5.25 x 10(54) erg is derived, and the corresponding gamma-ray radiation efficiency is estimated to be eta(gamma) = 3.1%. On the other hand, the standard afterglow model cannot reproduce the X-ray light curve of GRB 240825A, calling for improved models to characterize all multiwavelength data. |
| WOS关键词 | GAMMA-RAY-BURST ; LARGE-AREA TELESCOPE ; OPTICAL AFTERGLOWS ; PROMPT EMISSION ; X-RAY ; LIGHT CURVES ; MAGNETIC RECONNECTION ; INTERNAL SHOCKS ; LORENTZ FACTORS ; MODEL |
| 资助项目 | French Space Agency (CNES) ; Chinese Academy of Sciences (CAS) ; CNES ; CNRS |
| WOS研究方向 | Astronomy & Astrophysics |
| 语种 | 英语 |
| WOS记录号 | WOS:001551670900001 |
| 出版者 | IOP Publishing Ltd |
| 资助机构 | French Space Agency (CNES) ; Chinese Academy of Sciences (CAS) ; CNES ; CNRS |
| 源URL | [http://ir.xao.ac.cn/handle/45760611-7/8045]  |
| 专题 | 研究单元未命名 |
| 通讯作者 | Wang, Yun; Xin, Li-Ping; Wei, Jian-Yan |
| 作者单位 | 1.E Kharadze Georgian Natl Astrophys Observ, Abastumani 0301, Adigeni, Georgia 2.Univ Chinese Acad Sci, Sch Astron & Space Sci, Beijing 101408, Peoples R China 3.Chinese Acad Sci, Natl Astron Observ, Beijing 100101, Peoples R China 4.Liverpool John Moores Univ, Astrophys Res Inst, IC2 Liverpool Sci Pk,146 Brownlow Hill, Liverpool L3 5RF, England 5.INAF Osservatorio Astron Brera, Via E Bianchi 46, I-23807 Merate, LC, Italy 6.INAF Osservatorio Astron Padova, Vicolo Osservatorio 5, I-35122 Padua, Italy 7.Univ Paris Saclay, Univ Paris Cite, CEA, CNRS,AIM, F-91191 Gif Sur Yvette, France 8.Chinese Acad Sci, Xinjiang Astron Observ, Urumqi 830011, Peoples R China 9.Guangxi Univ, Sch Phys Sci & Technol, Guangxi Key Lab Relativist Astrophys, Nanning 530004, Peoples R China 10.Univ Sci & Technol China, Sch Astron & Space Sci, Hefei 230026, Peoples R China |
| 推荐引用方式 GB/T 7714 | Wu, Chao,Wang, Yun,Li, Hua-Li,et al. GRB 240825A: Early Reverse Shock and Its Physical Implications[J]. RESEARCH IN ASTRONOMY AND ASTROPHYSICS,2025,25(10):105003. |
| APA | Wu, Chao.,Wang, Yun.,Li, Hua-Li.,Xin, Li-Ping.,Xu, Dong.,...&De Pasquale, Massimiliano.(2025).GRB 240825A: Early Reverse Shock and Its Physical Implications.RESEARCH IN ASTRONOMY AND ASTROPHYSICS,25(10),105003. |
| MLA | Wu, Chao,et al."GRB 240825A: Early Reverse Shock and Its Physical Implications".RESEARCH IN ASTRONOMY AND ASTROPHYSICS 25.10(2025):105003. |
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