Possible origin of AT2021any: A failed gamma-ray burst from a structured jet
文献类型：期刊论文
| 作者 | Xu, Fan4; Huang, Yong-Feng2,3,4; Geng, Jin-Jun1 |
| 刊名 | ASTRONOMY & ASTROPHYSICS
 |
| 出版日期 | 2023-11-28 |
| 卷号 | 679页码:A103 |
| 关键词 | gamma-ray burst: general gamma-ray burst: individual: AT2021any methods: numerical radiation mechanisms: non-thermal |
| ISSN号 | 0004-6361 |
| DOI | 10.1051/0004-6361/202346674 |
| 产权排序 | 3 |
| 英文摘要 | Afterglows not associated with any gamma-ray bursts (GRBs) are called orphan afterglows. The detection of such afterglows is an important goal in many sky survey programs. Recently, a promising orphan afterglow candidate, AT2021any, was found by the Zwicky Transient Facility. In this work, we performed multi-wavelength fittings of AT2021any with two different outflow models, namely, the top-hat jet model and the structured Gaussian jet model. Although both models can fit the observed light curves well, we found that the structured Gaussian jet model presents a better result and is thus preferred by observations. In this framework, the best-fit Lorentz factor is about 68, which indicates that AT2021any should be a failed GRB. The half-opening angle of the jet and the viewing angle were found to be 0.1 and 0.02, respectively, which means that the jet is essentially observed on-axis. We inferred the trigger time of the GRB to be about 1000 s before the first detection of the orphan afterglow, and we derived an upper limit of 21.5% for the radiative efficiency, which is typical for GRBs. |
| WOS关键词 | FAST OPTICAL TRANSIENTS ; FOLLOW-UP OBSERVATIONS ; LIGHT CURVES ; RELATIVISTIC JET ; ALL-SKY ; AFTERGLOWS ; EMISSION ; SEARCH ; RADIO ; CONSTRAINTS |
| 资助项目 | National Key R&D Program of China ; National SKA Program of China[2020SKA0120300] ; National Natural Science Foundation of China[12233002] ; National Natural Science Foundation of China[12041306] ; National Natural Science Foundation of China[12273113] ; National Natural Science Foundation of China[12321003] ; Youth Innovations and Talents Project of Shandong Provincial Colleges and Universities[201909118] ; Youth Innovation Promotion Association[2023331] ; [2021YFA0718500] |
| WOS研究方向 | Astronomy & Astrophysics |
| 语种 | 英语 |
| WOS记录号 | WOS:001110288900008 |
| 出版者 | EDP SCIENCES S A |
| 资助机构 | National Key R&D Program of China ; National SKA Program of China ; National Natural Science Foundation of China ; Youth Innovations and Talents Project of Shandong Provincial Colleges and Universities ; Youth Innovation Promotion Association |
| 源URL | [http://ir.xao.ac.cn/handle/45760611-7/5727]  |
| 专题 | 研究单元未命名 |
| 通讯作者 | Xu, Fan; Huang, Yong-Feng |
| 作者单位 | 1.Chinese Acad Sci, Purple Mt Observ, Nanjing 210023, Peoples R China 2.Chinese Acad Sci, Xinjiang Astron Observ, Urumqi 830011, Peoples R China 3.Nanjing Univ, Minist Educ, Key Lab Modern Astron & Astrophys, Nanjing 210023, Peoples R China 4.Nanjing Univ, Sch Astron & Space Sci, Nanjing 210023, Peoples R China |
| 推荐引用方式 GB/T 7714 | Xu, Fan,Huang, Yong-Feng,Geng, Jin-Jun. Possible origin of AT2021any: A failed gamma-ray burst from a structured jet[J]. ASTRONOMY & ASTROPHYSICS,2023,679:A103. |
| APA | Xu, Fan,Huang, Yong-Feng,&Geng, Jin-Jun.(2023).Possible origin of AT2021any: A failed gamma-ray burst from a structured jet.ASTRONOMY & ASTROPHYSICS,679,A103. |
| MLA | Xu, Fan,et al."Possible origin of AT2021any: A failed gamma-ray burst from a structured jet".ASTRONOMY & ASTROPHYSICS 679(2023):A103. |
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来源：新疆天文台
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