EP240801a/XRF 240801B: An X-Ray Flash Detected by the Einstein Probe and the Implications of Its Multiband Afterglow
文献类型：期刊论文
| 作者 | Jiang, Shuai-Qing64,65; Xu, Dong63,65; Hoof, Agnes P. C. van62; Lei, Wei-Hua61; Liu, Yuan65; Zhou, Hao60; Chen, Yong59; Fu, Shao-Yu65; Yang, Jun57,58; Liu, Xing64,65 |
| 刊名 | ASTROPHYSICAL JOURNAL LETTERS
 |
| 出版日期 | 2025-07-20 |
| 卷号 | 988期号:1 |
| ISSN号 | 2041-8205 |
| DOI | 10.3847/2041-8213/addebf |
| 产权排序 | 第53完成单位 |
| 文献子类 | Article |
| 英文摘要 | We present multiband observations and analysis of EP240801a, a low-energy, extremely soft gamma-ray burst (GRB) discovered on 2024 August 1 by the Einstein Probe (EP) satellite with a weak contemporaneous signal also detected by the Fermi Gamma-ray Burst Monitor (GBM). Optical spectroscopy of the afterglow, obtained by Gran Telescopio Canarias and Keck, identified the redshift of z = 1.6734. EP240801a exhibits a burst duration of 148 s in X-rays and 22.3 s in gamma rays, with X-rays leading by 80.61 s. Spectral lag analysis indicates that the gamma-ray signal arrived 8.3 s earlier than the X-rays. Joint spectral fitting of EP Wide-field X-ray Telescope and Fermi/GBM data yields an isotropic energy E gamma,iso=(5.57-0.50+0.54)x1051erg , a peak energy Epeak=14.90-4.71+7.08keV , and a fluence ratio S(25-50 keV)/S (50-100keV)=1.67-0.46+0.74 , classifying EP240801a as an X-ray flash (XRF). The host-galaxy continuum spectrum, inferred using Prospector, was used to correct its contribution for the observed outburst optical data. Unusual early R-band behavior and EP Follow-up X-ray Telescope observations suggest multiple components in the afterglow. Three models are considered: a two-component jet model, a forward-reverse shock model, and a forward shock model with energy injection. All three provide reasonable explanations. The two-component jet model and the energy injection model imply a relatively small initial energy and velocity of the jet in the line of sight, while the forward-reverse shock model remains typical. Under the two-component jet model, EP240801a may resemble GRB 221009A (BOAT) if the bright narrow beam is viewed on-axis. Therefore, EP240801a can be interpreted as an off-beam (narrow) jet or an intrinsically weak GRB jet. Our findings provide crucial clues for uncovering the origin of XRFs. |
| 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 | TEMPLE CIRCUS, TEMPLE WAY, BRISTOL BS1 6BE, ENGLAND |
| WOS关键词 | HYPERACCRETING BLACK-HOLE ; EARLY OPTICAL AFTERGLOWS ; TIDAL DISRUPTION EVENT ; BURST AFTERGLOWS ; ENERGY INJECTION ; REVERSE SHOCK ; LIGHT CURVES ; EVOLUTION ; MODEL ; EMISSION |
| 资助项目 | Instituto de Astrofisica de Andalucia (IAA); University of Copenhagen; NASA; W. M. Keck Foundation; KAIT; Sun Microsystems, Inc.; Hewlett-Packard Company; AutoScope Corporation, Lick Observatory; U.S. NSF; TABASGO Foundation |
| WOS研究方向 | Astronomy & Astrophysics |
| 语种 | 英语 |
| WOS记录号 | WOS:001531168500001 |
| 出版者 | IOP Publishing Ltd |
| 资助机构 | Instituto de Astrofisica de Andalucia (IAA) ; University of Copenhagen ; NASA ; W. M. Keck Foundation ; KAIT ; Sun Microsystems, Inc. ; Hewlett-Packard Company ; AutoScope Corporation, Lick Observatory ; U.S. NSF ; TABASGO Foundation |
| 版本 | 出版稿 |
| 源URL | [http://ir.ynao.ac.cn/handle/114a53/28434]  |
| 专题 | 星系类星体研究组 云南天文台_中国科学院天体结构与演化重点实验室 |
| 通讯作者 | Xu, Dong |
| 作者单位 | 1.University of Warwick, Department of Physics, Coventry, CV4 7AL, UK; 2.Department of Physics, School of Physics and Materials Science, Nanchang University, Nanchang 330031, People’s Republic of China 3.Adler Planetarium, 1300 South DuSable Lake Shore Drive, Chicago, IL 60605, USA; 4.National Astronomical Research Institute of Thailand, 260 Moo 4, T. Donkaew, A. Maerim, Chiangmai, 50180, Thailand; 5.Aix Marseille Université, CNRS, CNES, LAM, Marseille, France; 6.Massachusetts Institute of Technology, Kavli Institute for Astrophysics and Space Research, Cambridge, MA, USA; 7.Center for Astrophysics and Cosmology, Science Institute, University of Iceland, Dunhagi 5, 107 Reykjavík, Iceland; 8.Department of Physics and Astronomy, Clemson University, Clemson, SC 29631, USA; 9.Space Telescope Science Institute, 3700 San Martin Drive, Baltimore, MD 21218, USA; 10.Department of Physics, University of California, Santa Barbara, CA 93106-9530, USA; |
| 推荐引用方式 GB/T 7714 | Jiang, Shuai-Qing,Xu, Dong,Hoof, Agnes P. C. van,et al. EP240801a/XRF 240801B: An X-Ray Flash Detected by the Einstein Probe and the Implications of Its Multiband Afterglow[J]. ASTROPHYSICAL JOURNAL LETTERS,2025,988(1). |
| APA | Jiang, Shuai-Qing.,Xu, Dong.,Hoof, Agnes P. C. van.,Lei, Wei-Hua.,Liu, Yuan.,...&Zhang, Juan.(2025).EP240801a/XRF 240801B: An X-Ray Flash Detected by the Einstein Probe and the Implications of Its Multiband Afterglow.ASTROPHYSICAL JOURNAL LETTERS,988(1). |
| MLA | Jiang, Shuai-Qing,et al."EP240801a/XRF 240801B: An X-Ray Flash Detected by the Einstein Probe and the Implications of Its Multiband Afterglow".ASTROPHYSICAL JOURNAL LETTERS 988.1(2025). |
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来源：云南天文台
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