An Intertwined Short and Long GRB with 4-minute Separation
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arXiv
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| Format: | Preprint |
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2026
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| _version_ | 1866910098827247616 |
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| author | Li, Liang Wang, Yu Zhang, Bing Li, Ye Zhang, Shu-Rui Greiner, Jochen Jin, Zhi-Ping Geng, Jin-Jun Lv, Hou-Jun Peer, Asaf Dainotti, Maria Liu, Tong Fan, Yi-Zhong Huang, Yong-Feng Dai, Zi-Gao Kole, Melin Lei, Wei-Hua Yuan, Ye-Fei Zhang, Shuang-Nan Ryde, Felix Xue, She-Sheng Cai, Rong-Gen |
| author_facet | Li, Liang Wang, Yu Zhang, Bing Li, Ye Zhang, Shu-Rui Greiner, Jochen Jin, Zhi-Ping Geng, Jin-Jun Lv, Hou-Jun Peer, Asaf Dainotti, Maria Liu, Tong Fan, Yi-Zhong Huang, Yong-Feng Dai, Zi-Gao Kole, Melin Lei, Wei-Hua Yuan, Ye-Fei Zhang, Shuang-Nan Ryde, Felix Xue, She-Sheng Cai, Rong-Gen |
| contents | Gamma-ray bursts (GRBs), the most energetic transients in the Universe, are traditionally classified into long-duration ($T_{90}>2$ s) and short-duration ($T_{90}<2$ s) events, associated with the core collapse of massive stars (Type II) and the merger of compact binary systems (Type I), respectively. The two classes exhibit distinct observational properties that serve as key diagnostic criteria for classification. Here we report GRB 160425A, a peculiar event comprising two sub-bursts separated by four minutes: a short-duration burst ($G_1$) and a long-duration burst ($G_2$). Nearly all standard prompt-emission diagnostics, including pulse morphology, duration, hardness ratio, minimum variability timescale, spectral properties, and established empirical correlations, consistently categorize $G_1$ as a short-like (Type I, merger-origin) and $G_2$ as a long-like (Type II, collapsar-origin) GRB. The coexistence of merger and collapsar signatures in a single event challenges existing progenitor frameworks and calls for a re-evaluation of GRB classification schemes and progenitor scenarios. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2603_28699 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | An Intertwined Short and Long GRB with 4-minute Separation Li, Liang Wang, Yu Zhang, Bing Li, Ye Zhang, Shu-Rui Greiner, Jochen Jin, Zhi-Ping Geng, Jin-Jun Lv, Hou-Jun Peer, Asaf Dainotti, Maria Liu, Tong Fan, Yi-Zhong Huang, Yong-Feng Dai, Zi-Gao Kole, Melin Lei, Wei-Hua Yuan, Ye-Fei Zhang, Shuang-Nan Ryde, Felix Xue, She-Sheng Cai, Rong-Gen High Energy Astrophysical Phenomena Gamma-ray bursts (GRBs), the most energetic transients in the Universe, are traditionally classified into long-duration ($T_{90}>2$ s) and short-duration ($T_{90}<2$ s) events, associated with the core collapse of massive stars (Type II) and the merger of compact binary systems (Type I), respectively. The two classes exhibit distinct observational properties that serve as key diagnostic criteria for classification. Here we report GRB 160425A, a peculiar event comprising two sub-bursts separated by four minutes: a short-duration burst ($G_1$) and a long-duration burst ($G_2$). Nearly all standard prompt-emission diagnostics, including pulse morphology, duration, hardness ratio, minimum variability timescale, spectral properties, and established empirical correlations, consistently categorize $G_1$ as a short-like (Type I, merger-origin) and $G_2$ as a long-like (Type II, collapsar-origin) GRB. The coexistence of merger and collapsar signatures in a single event challenges existing progenitor frameworks and calls for a re-evaluation of GRB classification schemes and progenitor scenarios. |
| title | An Intertwined Short and Long GRB with 4-minute Separation |
| topic | High Energy Astrophysical Phenomena |
| url | https://arxiv.org/abs/2603.28699 |