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Minutes-long soft X-ray prompt emission from a compact object merger

by Hua-Li, Li , D'Elia, Valerio , Yi-Han, Iris Yin , Yu-Han, Yang , Perez-Garcia, Ignacio , Shu-Mei Jia , Kochiashvili, Nino , Zhi-Xing Ling , Jian-Yan, Wei , O'Connor, Brendan , Yi-Xuan Shao , Yong-Wei, Dong , Hou-Jun Lv , Xiao-Bo, Li , Tanasan, Manasanun , Chen, Yong , Xin-Lei, Chen , Jing-Wei, Hu , Shu-Xu, Yi , Zheng, Chao , Yuan, Weimin , Tanvir, Nial R , Zhang, Bing , Shi-Jie, Zheng , Shao-Lin, Xiong , Zhang, Chen , Wei-Hua, Lei , Levan, Andrew J , Troja, Eleonora , Hartmann, Dieter , Elhosseiny, Eslam , Pillas, Marion , Liu, Yuan , Ricci, Roberto , Yu-Lei, Qiu , Xu-Hui, Han , Cordier, Bertrand , Passaleva, Niccolò , Bin-Bin, Zhang , Xiao-Feng, Wang , Zhou, Ping , Hai-Wu, Pan , Saccardi, Andrea , Sánchez-Ramírez, Rubén , Hua-Qing, Cheng , Wen-Jun, Tan , Qin-Yu, Wu , Dong-Yue, Li , Ye-Hao, Cheng , Becerra, Rosa L , De Pasquale, Massimiliano , You-Dong, Hu , Cheng-Kui, Li , Yusufjon, Tillayev , Zhang, Shuang-Nan , Li, An , Wen-Da, Zhang , Gritsevich, Maria , Sun, Hui , Gao, He , Li-Ping, Xin , Guo-Ying, Zhao , An, Jie , Chen-Wei, Wang , Jia-Xin, Cao , Antier, Sarah , Yang, Jun , Malesani, Daniele B , Vergani, Susanna D , Xu, Dong , Eyles-Ferris, Rob A J , Pieterse, Daniëlle L A , Pandey, Shashi Bh

in Afterglows / Emission / Gamma ray bursts / Gravitational waves / Soft x rays

2026

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Minutes-long soft X-ray prompt emission from a compact object merger

in Afterglows / Emission / Gamma ray bursts / Gravitational waves / Soft x rays

2026

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Minutes-long soft X-ray prompt emission from a compact object merger

in Afterglows / Emission / Gamma ray bursts / Gravitational waves / Soft x rays

2026

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Paper

Minutes-long soft X-ray prompt emission from a compact object merger

Hua-Li, Li,

D'Elia, Valerio,

Yi-Han, Iris Yin,

Yu-Han, Yang,

Perez-Garcia, Ignacio,

Shu-Mei Jia,

Kochiashvili, Nino,

Zhi-Xing Ling,

Jian-Yan, Wei,

O'Connor, Brendan,

Yi-Xuan Shao,

Yong-Wei, Dong,

Hou-Jun Lv,

Xiao-Bo, Li,

Tanasan, Manasanun,

Chen, Yong,

Xin-Lei, Chen,

Jing-Wei, Hu,

Shu-Xu, Yi,

Zheng, Chao,

Yuan, Weimin,

Tanvir, Nial R,

Zhang, Bing,

Shi-Jie, Zheng,

Shao-Lin, Xiong,

Zhang, Chen,

Wei-Hua, Lei,

Levan, Andrew J,

Troja, Eleonora,

Hartmann, Dieter,

Elhosseiny, Eslam,

Pillas, Marion,

Liu, Yuan,

Ricci, Roberto,

Yu-Lei, Qiu,

Xu-Hui, Han,

Cordier, Bertrand,

Passaleva, Niccolò,

Bin-Bin, Zhang,

Xiao-Feng, Wang,

Zhou, Ping,

Hai-Wu, Pan,

Saccardi, Andrea,

Sánchez-Ramírez, Rubén,

Hua-Qing, Cheng,

Wen-Jun, Tan,

Qin-Yu, Wu,

Dong-Yue, Li,

Ye-Hao, Cheng,

Becerra, Rosa L,

De Pasquale, Massimiliano,

You-Dong, Hu,

Cheng-Kui, Li,

Yusufjon, Tillayev,

Zhang, Shuang-Nan,

Li, An,

Wen-Da, Zhang,

Gritsevich, Maria,

Sun, Hui,

Gao, He,

Li-Ping, Xin,

Guo-Ying, Zhao,

An, Jie,

Chen-Wei, Wang,

Jia-Xin, Cao,

Antier, Sarah,

Yang, Jun,

Malesani, Daniele B,

Vergani, Susanna D,

Xu, Dong,

Eyles-Ferris, Rob A J,

Pieterse, Daniëlle L A,

Pandey, Shashi Bh

2026

Overview

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 (\\(\\)2 s) bursts, yet this prompt X-ray component was not directly observed or confirmed. Here we report the discovery of a minutes-long (\\(\\)560 s) flash of soft X-rays immediately following the short (\\(\\)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.

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Publisher

Cornell University Library, arXiv.org

Subject

Afterglows

/ Emission

/ Gamma ray bursts

/ Gravitational waves

/ Soft x rays