A new subclass of gamma-ray burst originating from compact binary merger
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| Main Authors: | , , , , , , , , , , , , , , , , , |
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| Format: | Preprint |
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2024
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| _version_ | 1866914856062418944 |
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| author | Wang, Chen-Wei Tan, Wen-Jun Xiong, Shao-Lin Yi, Shu-Xu Moradi, Rahim Li, Bing Zhang, Zhen Wang, Yu Meng, Yan-Zhi Liu, Jia-Cong Wang, Yue Xie, Sheng-Lun Xue, Wang-Chen Yu, Zheng-Hang Zhang, Peng Zhang, Wen-Long Zhang, Yan-Qiu Zheng, Chao |
| author_facet | Wang, Chen-Wei Tan, Wen-Jun Xiong, Shao-Lin Yi, Shu-Xu Moradi, Rahim Li, Bing Zhang, Zhen Wang, Yu Meng, Yan-Zhi Liu, Jia-Cong Wang, Yue Xie, Sheng-Lun Xue, Wang-Chen Yu, Zheng-Hang Zhang, Peng Zhang, Wen-Long Zhang, Yan-Qiu Zheng, Chao |
| contents | Type I gamma-ray bursts (GRBs) are believed to originate from compact binary merger usually with duration less than 2 seconds for the main emission. However, recent observations of GRB 211211A and GRB 230307A indicate that some merger-origin GRBs could last much longer. Since they show strikingly similar properties (indicating a common mechanism) which are different from the classic "long"-short burst (e.g. GRB 060614), forming an interesting subclass of type I GRBs, we suggest to name them as type IL GRBs. By identifying the first peak of GRB 230307A as a quasi-thermal precursor, we find that the prompt emission of type IL GRB is composed of three episodes: (1) a precursor followed by a short quiescent (or weak emission) period, (2) a long-duration main emission, and (3) an extended emission. With this burst pattern, a good candidate, GRB 170228A, was found in the Fermi/GBM archive data, and subsequent temporal and spectral analyses indeed show that GRB 170228A falls in the same cluster with GRB 211211A and GRB 230307A in many diagnostic figures. Thus this burst pattern could be a good reference for rapidly identifying type IL GRB and conducting low-latency follow-up observation. We estimated the occurrence rate and discussed the physical origins and implications for the three emission episodes of type IL GRBs. Our analysis suggests the pre-merger precursor model, especially the super flare model, is more favored for type IL GRBs. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2407_02376 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | A new subclass of gamma-ray burst originating from compact binary merger Wang, Chen-Wei Tan, Wen-Jun Xiong, Shao-Lin Yi, Shu-Xu Moradi, Rahim Li, Bing Zhang, Zhen Wang, Yu Meng, Yan-Zhi Liu, Jia-Cong Wang, Yue Xie, Sheng-Lun Xue, Wang-Chen Yu, Zheng-Hang Zhang, Peng Zhang, Wen-Long Zhang, Yan-Qiu Zheng, Chao High Energy Astrophysical Phenomena Type I gamma-ray bursts (GRBs) are believed to originate from compact binary merger usually with duration less than 2 seconds for the main emission. However, recent observations of GRB 211211A and GRB 230307A indicate that some merger-origin GRBs could last much longer. Since they show strikingly similar properties (indicating a common mechanism) which are different from the classic "long"-short burst (e.g. GRB 060614), forming an interesting subclass of type I GRBs, we suggest to name them as type IL GRBs. By identifying the first peak of GRB 230307A as a quasi-thermal precursor, we find that the prompt emission of type IL GRB is composed of three episodes: (1) a precursor followed by a short quiescent (or weak emission) period, (2) a long-duration main emission, and (3) an extended emission. With this burst pattern, a good candidate, GRB 170228A, was found in the Fermi/GBM archive data, and subsequent temporal and spectral analyses indeed show that GRB 170228A falls in the same cluster with GRB 211211A and GRB 230307A in many diagnostic figures. Thus this burst pattern could be a good reference for rapidly identifying type IL GRB and conducting low-latency follow-up observation. We estimated the occurrence rate and discussed the physical origins and implications for the three emission episodes of type IL GRBs. Our analysis suggests the pre-merger precursor model, especially the super flare model, is more favored for type IL GRBs. |
| title | A new subclass of gamma-ray burst originating from compact binary merger |
| topic | High Energy Astrophysical Phenomena |
| url | https://arxiv.org/abs/2407.02376 |