Fast-cooling Synchrotron Prompt Emission from Internal Shocks in GRB 241030A
文献类型：期刊论文
| 作者 | Varun5,6,7,8; Zhang, Bin-Bin4,7,8; Zhao XH(赵晓红)2,3; Yang, Jun1; Chen, Run-Chao7,8; Chand, Vikas9 |
| 刊名 | ASTROPHYSICAL JOURNAL
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| 出版日期 | 2026-02-10 |
| 卷号 | 998期号:1 |
| ISSN号 | 0004-637X |
| DOI | 10.3847/1538-4357/ae2eaf |
| 产权排序 | 第6完成单位 |
| 文献子类 | Article |
| 英文摘要 | We present a time-resolved joint Swift-Fermi spectral study of GRB 241030A (z = 1.411) that cleanly isolates the synchrotron origin of its prompt emission and favors a matter-dominated internal-shock scenario. The light curve shows two episodes separated by a quiescent gap. Episode 1 (0-45 s) is well described by a single power law with photon index similar or equal to -3/2, consistent with the fast-cooling synchrotron slope below the peak. Episode 2 (100-200 s) exhibits two robust spectral breaks: a low-energy break at Eb similar to 2-3 keV that remains nearly constant in time, and a spectral peak Ep that tracks the flux within pulses but steps down between them. The photon indices below and above Eb cluster around -2/3 and -3/2, respectively, as expected for fast-cooling synchrotron emission. The burst displays an unusually small (consistent with zero) spectral lag across Fermi Gamma-ray Burst Monitor bands. At later times (greater than or similar to 230 s), the spectrum softens toward similar to-2.7, as expected when the observing band lies above both nu m and nu c. These behaviors are difficult to reconcile with a globally magnetized outflow with a decaying field, which naturally produces hard-to-soft Ep evolution, growing nu c, and appreciable lags. By contrast, internal shocks with a roughly steady effective magnetic field and a time-variable minimum electron Lorentz factor (equivalently, for example, a varying fraction of accelerated electrons) simultaneously account for: (1) the stable Eb; (2) the intensity-tracking yet stepped-down Ep; (3) the canonical -2/3 and -3/2 slopes; and (4) the near-zero lag. |
| 学科主题 | 天文学 ; 天体物理学 ; 高能天体物理学 ; 星系与宇宙学 |
| URL标识 | 查看原文 |
| 出版地 | No.2 The Distillery, Glassfields, Avon Street, Bristol, ENGLAND |
| WOS关键词 | GAMMA-RAY BURSTS ; SPECTRAL LAGS ; ENERGY ; BRIGHT ; LUMINOSITY ; CATALOG ; ORIGIN ; BREAKS ; MODEL |
| 资助项目 | National Natural Science Foundation of China[12121003]; National Natural Science Foundation of China[12573046]; National Natural Science Foundation of China[13001106]; National Natural Science Foundation of China[12393811]; National Natural Science Foundation of China[12473048]; National Key Research and Development Programs of China[2022YFF0711404]; National Key Research and Development Programs of China[2022SKA0130102]; National SKA Program of China[2022SKA0130100]; China Manned Space Project[CMS-CSST-2021-B11]; Fundamental Research Funds for the Central Universities; Program for Innovative Talents and Entrepreneurs in Jiangsu |
| WOS研究方向 | Astronomy & Astrophysics |
| 语种 | 英语 |
| WOS记录号 | WOS:001683679700001 |
| 出版者 | IOP Publishing Ltd |
| 资助机构 | National Natural Science Foundation of China[12121003, 12573046, 13001106, 12393811, 12473048] ; National Key Research and Development Programs of China[2022YFF0711404, 2022SKA0130102] ; National SKA Program of China[2022SKA0130100] ; China Manned Space Project[CMS-CSST-2021-B11] ; Fundamental Research Funds for the Central Universities ; Program for Innovative Talents and Entrepreneurs in Jiangsu |
| 版本 | 出版稿 |
| 源URL | [http://ir.ynao.ac.cn/handle/114a53/28924]  |
| 专题 | 星系类星体研究组 |
| 通讯作者 | Zhang, Bin-Bin |
| 作者单位 | 1.Institute for Astrophysics, School of Physics, Zhengzhou University, Zhengzhou 450001, People’s Republic of China; 2.Center for Astronomical Mega-Science, Chinese Academy of Sciences, Beijing 100012, People’s Republic of China; 3.Yunnan Observatories, Chinese Academy of Sciences, Kunming 650216, People’s Republic of China; zhaoxh@ynao.ac.cn; 4.Purple Mountain Observatory, Chinese Academy of Sciences, Nanjing 210023, People’s Republic of China; 5.The Oskar Klein Centre for Cosmoparticle Physics, AlbaNova University Center, 106 91 Stockholm, Sweden; 6.KTH Royal Institute of Technology, Department of Physics, 106 91 Stockholm, Sweden; 7.Key Laboratory of Modern Astronomy and Astrophysics (Nanjing University), Ministry of Education, Nanjing 210046, People’s Republic of China; 8.School of Astronomy and Space Science, Nanjing University, Nanjing 210093, People’s Republic of China; bbzhang@nju.edu.cn; 9.Louisiana State University, Department of Physics and Astronomy, Baton Rouge, LA 70803, USA |
| 推荐引用方式 GB/T 7714 | Varun,Zhang, Bin-Bin,Zhao XH,et al. Fast-cooling Synchrotron Prompt Emission from Internal Shocks in GRB 241030A[J]. ASTROPHYSICAL JOURNAL,2026,998(1). |
| APA | Varun,Zhang, Bin-Bin,赵晓红,Yang, Jun,Chen, Run-Chao,&Chand, Vikas.(2026).Fast-cooling Synchrotron Prompt Emission from Internal Shocks in GRB 241030A.ASTROPHYSICAL JOURNAL,998(1). |
| MLA | Varun,et al."Fast-cooling Synchrotron Prompt Emission from Internal Shocks in GRB 241030A".ASTROPHYSICAL JOURNAL 998.1(2026). |
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来源：云南天文台
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