GECAM discovery of a peculiar magnetar X-ray burst (MXB 221120) from SGR J1935+2154 associated with a fast radio burst
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arXiv
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2026
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| author | Tan, Wen-Jun Wang, Yue Wang, Chen-Wei Xiong, Shao-Lin Li, Xiao-Bo Zhang, Shuang-Nan Cai, Ce Xue, Wang-Chen Zhang, Peng Wu, Bo-Bing An, Zheng-Hua Gao, Ming Ge, Ming-Yu Gong, Ke Guo, Dong-Ya Guo, Hao-Xuan Hao, Long-Fei Huang, Yue Huang, Yu-Xiang Lee, Ke-Jia Li, Bing Li, Kui-Cheng Li, Xin-Qiao Liu, Jia-Cong Liu, Xiao-Jing Liu, Ya-Qing Ma, Xiang Peng, Wen-Xi Qiao, Rui Ren, Yang-Zhao Song, Li-Ming Sun, Xi-Lei Wang, Jin Wang, Jin-Zhou Wang, Ping Wen, Xiang-Yang Xiao, Shuo Xie, Lun-Sheng Xu, Heng Yang, Sheng Yi, Shu-Xu Yi, Qi-bin Yu, Zheng-Hang Zhang, Li-Da Zhang, Fan Zhang, Hong-Mei Zhang, Jin-Peng Zhang, Yan-Qiu Zhang, Zhen Zhao, Xiao-Yun Zhao, Yi Zheng, Chao Zheng, Shi-Jie |
| author_facet | Tan, Wen-Jun Wang, Yue Wang, Chen-Wei Xiong, Shao-Lin Li, Xiao-Bo Zhang, Shuang-Nan Cai, Ce Xue, Wang-Chen Zhang, Peng Wu, Bo-Bing An, Zheng-Hua Gao, Ming Ge, Ming-Yu Gong, Ke Guo, Dong-Ya Guo, Hao-Xuan Hao, Long-Fei Huang, Yue Huang, Yu-Xiang Lee, Ke-Jia Li, Bing Li, Kui-Cheng Li, Xin-Qiao Liu, Jia-Cong Liu, Xiao-Jing Liu, Ya-Qing Ma, Xiang Peng, Wen-Xi Qiao, Rui Ren, Yang-Zhao Song, Li-Ming Sun, Xi-Lei Wang, Jin Wang, Jin-Zhou Wang, Ping Wen, Xiang-Yang Xiao, Shuo Xie, Lun-Sheng Xu, Heng Yang, Sheng Yi, Shu-Xu Yi, Qi-bin Yu, Zheng-Hang Zhang, Li-Da Zhang, Fan Zhang, Hong-Mei Zhang, Jin-Peng Zhang, Yan-Qiu Zhang, Zhen Zhao, Xiao-Yun Zhao, Yi Zheng, Chao Zheng, Shi-Jie |
| contents | Fast radio bursts (FRBs) are enigmatic cosmic transients of millisecond duration observed in the radio band. The identification of FRB-associated magnetar X-ray bursts (MXBs) from galactic magnetar SGR J1935+2154 suggests that at least a fraction of FRBs can be produced from magnetar activity. However, the sample size of FRB-associated MXBs is still very small. Here we report a bright and peculiar FRB-associated MXB from SGR J1935+2154 detected by GECAM on November 20, 2022, dubbed MXB 221120. We find that both temporal and spectral properties of MXB 221120 exhibit distinctive features. Its light curve could be generally described by a single FRED function with superposition of several narrow pulses. Interestingly, we identify a possible QPO feature with center frequency of ~18 Hz in this MXB. The time-integrated spectrum is best fitted by a blackbody model with temperature (kT ) of 18.6 keV, rendering it the first thermal spectrum FRB-associated MXB from SGR J1935+2154. Compared to other MXBs with single emission episode, MXB 221120 has longer duration and higher blackbody temperature, making it an outlier in the burst sample. These results indicate that MXB 221120 may be produced by a special mechanism with extreme physical conditions. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2604_02261 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | GECAM discovery of a peculiar magnetar X-ray burst (MXB 221120) from SGR J1935+2154 associated with a fast radio burst Tan, Wen-Jun Wang, Yue Wang, Chen-Wei Xiong, Shao-Lin Li, Xiao-Bo Zhang, Shuang-Nan Cai, Ce Xue, Wang-Chen Zhang, Peng Wu, Bo-Bing An, Zheng-Hua Gao, Ming Ge, Ming-Yu Gong, Ke Guo, Dong-Ya Guo, Hao-Xuan Hao, Long-Fei Huang, Yue Huang, Yu-Xiang Lee, Ke-Jia Li, Bing Li, Kui-Cheng Li, Xin-Qiao Liu, Jia-Cong Liu, Xiao-Jing Liu, Ya-Qing Ma, Xiang Peng, Wen-Xi Qiao, Rui Ren, Yang-Zhao Song, Li-Ming Sun, Xi-Lei Wang, Jin Wang, Jin-Zhou Wang, Ping Wen, Xiang-Yang Xiao, Shuo Xie, Lun-Sheng Xu, Heng Yang, Sheng Yi, Shu-Xu Yi, Qi-bin Yu, Zheng-Hang Zhang, Li-Da Zhang, Fan Zhang, Hong-Mei Zhang, Jin-Peng Zhang, Yan-Qiu Zhang, Zhen Zhao, Xiao-Yun Zhao, Yi Zheng, Chao Zheng, Shi-Jie High Energy Astrophysical Phenomena Fast radio bursts (FRBs) are enigmatic cosmic transients of millisecond duration observed in the radio band. The identification of FRB-associated magnetar X-ray bursts (MXBs) from galactic magnetar SGR J1935+2154 suggests that at least a fraction of FRBs can be produced from magnetar activity. However, the sample size of FRB-associated MXBs is still very small. Here we report a bright and peculiar FRB-associated MXB from SGR J1935+2154 detected by GECAM on November 20, 2022, dubbed MXB 221120. We find that both temporal and spectral properties of MXB 221120 exhibit distinctive features. Its light curve could be generally described by a single FRED function with superposition of several narrow pulses. Interestingly, we identify a possible QPO feature with center frequency of ~18 Hz in this MXB. The time-integrated spectrum is best fitted by a blackbody model with temperature (kT ) of 18.6 keV, rendering it the first thermal spectrum FRB-associated MXB from SGR J1935+2154. Compared to other MXBs with single emission episode, MXB 221120 has longer duration and higher blackbody temperature, making it an outlier in the burst sample. These results indicate that MXB 221120 may be produced by a special mechanism with extreme physical conditions. |
| title | GECAM discovery of a peculiar magnetar X-ray burst (MXB 221120) from SGR J1935+2154 associated with a fast radio burst |
| topic | High Energy Astrophysical Phenomena |
| url | https://arxiv.org/abs/2604.02261 |