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| Format: | Preprint |
| Published: |
2026
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| Subjects: | |
| Online Access: | https://arxiv.org/abs/2601.14137 |
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| _version_ | 1866908776556134400 |
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| author | Li, An Wang, Chen-Wei Passaleva, Niccolò An, Jie Zhang, Bin-Bin Troja, Eleonora Yin, Yi-Han Iris Liu, Yuan Xiong, Shao-Lin Xin, Li-Ping Shao, Yi-Xuan Yang, Jun Sun, Hui Xu, Dong Yang, Yu-Han Ricci, Roberto Gao, He Antier, Sarah Becerra, Rosa L. Cao, Jia-Xin Castro-Tirado, Alberto Javier Chen, Xin-Lei Cheng, Ye-Hao Chen, Yong Cheng, Hua-Qing D'Elia, Valerio De Pasquale, Massimiliano Dong, Yong-Wei Elhosseiny, Eslam Eyles-Ferris, Rob A. J. Gritsevich, Maria Han, Xu-Hui Hartmann, Dieter Hu, You-Dong Hu, Jing-Wei Jia, Shu-Mei Kochiashvili, Nino Lei, Wei-Hua Levan, Andrew J. Li, Cheng-Kui Li, Dong-Yue Li, Hua-Li Li, Xiao-Bo Ling, Zhi-Xing Liu, He-Yang Lv, Hou-Jun Malesani, Daniele B. O'Connor, Brendan Pan, Hai-Wu Pandey, Shashi Bhushan Perez-Garcia, Ignacio Pieterse, Daniëlle L. A. Pillas, Marion Qiu, Yu-Lei Saccardi, Andrea Sánchez-Ramírez, Rubén Tan, Wen-Jun Tanasan, Manasanun Tanvir, Nial R. Vergani, Susanna D. Wang, Jing Wang, Xiao-Feng Wu, Qin-Yu Yi, Shu-Xu Yusufjon, Tillayev Zhang, Chen Zhang, Wen-Da Zhang, Yi-Jia Zhao, Guo-Ying Zheng, Chao Zheng, Shi-Jie Zhou, Chang Zhou, Ping Cordier, Bertrand Wei, Jian-Yan Yuan, Weimin Zhang, Shuang-Nan Zhang, Bing |
| author_facet | Li, An Wang, Chen-Wei Passaleva, Niccolò An, Jie Zhang, Bin-Bin Troja, Eleonora Yin, Yi-Han Iris Liu, Yuan Xiong, Shao-Lin Xin, Li-Ping Shao, Yi-Xuan Yang, Jun Sun, Hui Xu, Dong Yang, Yu-Han Ricci, Roberto Gao, He Antier, Sarah Becerra, Rosa L. Cao, Jia-Xin Castro-Tirado, Alberto Javier Chen, Xin-Lei Cheng, Ye-Hao Chen, Yong Cheng, Hua-Qing D'Elia, Valerio De Pasquale, Massimiliano Dong, Yong-Wei Elhosseiny, Eslam Eyles-Ferris, Rob A. J. Gritsevich, Maria Han, Xu-Hui Hartmann, Dieter Hu, You-Dong Hu, Jing-Wei Jia, Shu-Mei Kochiashvili, Nino Lei, Wei-Hua Levan, Andrew J. Li, Cheng-Kui Li, Dong-Yue Li, Hua-Li Li, Xiao-Bo Ling, Zhi-Xing Liu, He-Yang Lv, Hou-Jun Malesani, Daniele B. O'Connor, Brendan Pan, Hai-Wu Pandey, Shashi Bhushan Perez-Garcia, Ignacio Pieterse, Daniëlle L. A. Pillas, Marion Qiu, Yu-Lei Saccardi, Andrea Sánchez-Ramírez, Rubén Tan, Wen-Jun Tanasan, Manasanun Tanvir, Nial R. Vergani, Susanna D. Wang, Jing Wang, Xiao-Feng Wu, Qin-Yu Yi, Shu-Xu Yusufjon, Tillayev Zhang, Chen Zhang, Wen-Da Zhang, Yi-Jia Zhao, Guo-Ying Zheng, Chao Zheng, Shi-Jie Zhou, Chang Zhou, Ping Cordier, Bertrand Wei, Jian-Yan Yuan, Weimin Zhang, Shuang-Nan Zhang, Bing |
| contents | Compact object mergers are multi-messenger sources and progenitors of some gamma-ray bursts (GRBs), primarily understood by gamma-ray observations, while poorly constrained in the prompt low-energy phase. A long-lasting X-ray emission was discussed as afterglows following several short-duration ($\lesssim$2 s) bursts, yet this prompt X-ray component was not directly observed or confirmed. Here we report the discovery of a minutes-long ($\sim$560 s) flash of soft X-rays immediately following the short ($\sim$0.4 s) GRB 250704B. The long-soft bump points to a distinct phase of prompt emission in X-rays detected by Einstein Probe in an event that otherwise appear as an ordinary short GRB, showing that long-lasting X-ray emission is likely a common feature of merger-driven bursts and a promising electromagnetic counterpart to gravitational-wave sources. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2601_14137 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Minutes-long soft X-ray prompt emission from a compact object merger Li, An Wang, Chen-Wei Passaleva, Niccolò An, Jie Zhang, Bin-Bin Troja, Eleonora Yin, Yi-Han Iris Liu, Yuan Xiong, Shao-Lin Xin, Li-Ping Shao, Yi-Xuan Yang, Jun Sun, Hui Xu, Dong Yang, Yu-Han Ricci, Roberto Gao, He Antier, Sarah Becerra, Rosa L. Cao, Jia-Xin Castro-Tirado, Alberto Javier Chen, Xin-Lei Cheng, Ye-Hao Chen, Yong Cheng, Hua-Qing D'Elia, Valerio De Pasquale, Massimiliano Dong, Yong-Wei Elhosseiny, Eslam Eyles-Ferris, Rob A. J. Gritsevich, Maria Han, Xu-Hui Hartmann, Dieter Hu, You-Dong Hu, Jing-Wei Jia, Shu-Mei Kochiashvili, Nino Lei, Wei-Hua Levan, Andrew J. Li, Cheng-Kui Li, Dong-Yue Li, Hua-Li Li, Xiao-Bo Ling, Zhi-Xing Liu, He-Yang Lv, Hou-Jun Malesani, Daniele B. O'Connor, Brendan Pan, Hai-Wu Pandey, Shashi Bhushan Perez-Garcia, Ignacio Pieterse, Daniëlle L. A. Pillas, Marion Qiu, Yu-Lei Saccardi, Andrea Sánchez-Ramírez, Rubén Tan, Wen-Jun Tanasan, Manasanun Tanvir, Nial R. Vergani, Susanna D. Wang, Jing Wang, Xiao-Feng Wu, Qin-Yu Yi, Shu-Xu Yusufjon, Tillayev Zhang, Chen Zhang, Wen-Da Zhang, Yi-Jia Zhao, Guo-Ying Zheng, Chao Zheng, Shi-Jie Zhou, Chang Zhou, Ping Cordier, Bertrand Wei, Jian-Yan Yuan, Weimin Zhang, Shuang-Nan Zhang, Bing High Energy Astrophysical Phenomena Compact object mergers are multi-messenger sources and progenitors of some gamma-ray bursts (GRBs), primarily understood by gamma-ray observations, while poorly constrained in the prompt low-energy phase. A long-lasting X-ray emission was discussed as afterglows following several short-duration ($\lesssim$2 s) bursts, yet this prompt X-ray component was not directly observed or confirmed. Here we report the discovery of a minutes-long ($\sim$560 s) flash of soft X-rays immediately following the short ($\sim$0.4 s) GRB 250704B. The long-soft bump points to a distinct phase of prompt emission in X-rays detected by Einstein Probe in an event that otherwise appear as an ordinary short GRB, showing that long-lasting X-ray emission is likely a common feature of merger-driven bursts and a promising electromagnetic counterpart to gravitational-wave sources. |
| title | Minutes-long soft X-ray prompt emission from a compact object merger |
| topic | High Energy Astrophysical Phenomena |
| url | https://arxiv.org/abs/2601.14137 |