On the Ultra-Long Gamma-Ray Transient GRB 250702B/EP250702
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arXiv
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| Natura: | Preprint |
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2025
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| _version_ | 1866917179527528448 |
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| author | Zhang, Jin-Peng Wang, Chen-Wei Yu, Zheng-Hang Xiong, Shao-Lin Yi, Shu-Xu Liu, Jia-Cong Xue, Wang-Chen Tan, Wen-Jun Zhang, Zi-Rui Moradi, Rahim Guo, Hao-Xuan Zheng, Chao Zhang, Yan-Qiu Wang, Yue Xie, Sheng-Lun Zhang, Peng Ren, Yang-Zhao Li, Cheng-Kui Li, Xiao-Bo Cai, Ce Xiao, Shuo Song, Li-Ming Zhang, Shuang-Nan |
| author_facet | Zhang, Jin-Peng Wang, Chen-Wei Yu, Zheng-Hang Xiong, Shao-Lin Yi, Shu-Xu Liu, Jia-Cong Xue, Wang-Chen Tan, Wen-Jun Zhang, Zi-Rui Moradi, Rahim Guo, Hao-Xuan Zheng, Chao Zhang, Yan-Qiu Wang, Yue Xie, Sheng-Lun Zhang, Peng Ren, Yang-Zhao Li, Cheng-Kui Li, Xiao-Bo Cai, Ce Xiao, Shuo Song, Li-Ming Zhang, Shuang-Nan |
| contents | GRB 250702B/EP250702a is an interesting long-duration gamma-ray transient whose nature is in debate. To obtain a full picture in gamma-ray band, we implement a comprehensive targeted search of burst emission in a wide window of 30 days jointly with Insight-HXMT, GECAM and Fermi/GBM data within the ETJASMIN framework. In gamma-ray band, we find there is a 50-second precursor about 25 hours before the 4-hour main burst, which generally consists of 4 emission episodes. Remarkably, we find that the soft X-ray emission (after the main burst) decays as a power-law with start time aligning with the last episode of main emission and index of -5/3 perfectly consistent with the canonical prediction of fallback accretion. We conclude that the properties of precursor, main burst and the following soft X-ray emission strongly support the atypical collapsar Ultra-Long Gamma-Ray Burst (ULGRB) scenario rather than the Tidal Disruption Event (TDE), and all these gamma-ray and soft X-ray emission probably originate from relativistic jet whose luminosity is dominated by the fallback accretion rate during the death collapse of a supergiant star. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2509_26283 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | On the Ultra-Long Gamma-Ray Transient GRB 250702B/EP250702 Zhang, Jin-Peng Wang, Chen-Wei Yu, Zheng-Hang Xiong, Shao-Lin Yi, Shu-Xu Liu, Jia-Cong Xue, Wang-Chen Tan, Wen-Jun Zhang, Zi-Rui Moradi, Rahim Guo, Hao-Xuan Zheng, Chao Zhang, Yan-Qiu Wang, Yue Xie, Sheng-Lun Zhang, Peng Ren, Yang-Zhao Li, Cheng-Kui Li, Xiao-Bo Cai, Ce Xiao, Shuo Song, Li-Ming Zhang, Shuang-Nan High Energy Astrophysical Phenomena GRB 250702B/EP250702a is an interesting long-duration gamma-ray transient whose nature is in debate. To obtain a full picture in gamma-ray band, we implement a comprehensive targeted search of burst emission in a wide window of 30 days jointly with Insight-HXMT, GECAM and Fermi/GBM data within the ETJASMIN framework. In gamma-ray band, we find there is a 50-second precursor about 25 hours before the 4-hour main burst, which generally consists of 4 emission episodes. Remarkably, we find that the soft X-ray emission (after the main burst) decays as a power-law with start time aligning with the last episode of main emission and index of -5/3 perfectly consistent with the canonical prediction of fallback accretion. We conclude that the properties of precursor, main burst and the following soft X-ray emission strongly support the atypical collapsar Ultra-Long Gamma-Ray Burst (ULGRB) scenario rather than the Tidal Disruption Event (TDE), and all these gamma-ray and soft X-ray emission probably originate from relativistic jet whose luminosity is dominated by the fallback accretion rate during the death collapse of a supergiant star. |
| title | On the Ultra-Long Gamma-Ray Transient GRB 250702B/EP250702 |
| topic | High Energy Astrophysical Phenomena |
| url | https://arxiv.org/abs/2509.26283 |