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Main Authors:	Wang, Chen-Wei, Xiong, Shao-Lin, Wang, Yue, Tan, Wen-Jun, Li, Xiao-Bo, Li, Dong-Zi, Zhang, Yan-Qiu, Yi, Shu-Xu, Ge, Ming-Yu, Xie, Sheng-Lun, Xue, Wang-Chen, Li, Bing, Li, Cheng-Kui, An, Zheng-Hua, Cai, Ce, Feng, Pei-Yi, Gao, Min, Gong, Ke, Guo, Dong-Ya, Guo, Hao-Xuan, Huang, Yue, Liu, Jia-Cong, Li, Xin-Qiao, Liu, Ya-Qing, Liu, Xiao-Jing, 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, Yang, Sheng, Yi, Qi-Bin, Yu, Zheng-Hang, Zhang, Da-Li, Zhang, Fan, Zhang, Wen-Long, Zhang, Jin-Peng, Zhang, Peng, Zhang, Shuan-Nan, Zhang, Zhen, Zhao, Xiao-Yun, Zhao, Yi, Zheng, Chao, Zheng, Shi-Jie
Format:	Preprint
Published:	2026
Subjects:	High Energy Astrophysical Phenomena
Online Access:	https://arxiv.org/abs/2602.10895
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Fast radio burst (FRB) is mysterious phenomenon with millisecond-duration radio pulses observed mostly from cosmological distance. The association between FRB 200428 and a magnetar X-ray burst (MXB) from SGR J1935+2154 has significantly advanced the understanding of FRB and magnetar bursts. However, it is uncertain whether this association between MXB and FRB (i.e. MXB/FRB 200428) is genuine or just coincidental only based on this single event. Here we report the discovery of a bright ($\rm\sim7.6\times10^{-7}\,erg \cdot cm^{-2}$ in 1-250 keV) magnetar X-ray burst detected by GECAM on October 14th, 2022 (dubbed as MXB 221014) from SGR J1935+2154, which is associated with a FRB detected by CHIME and GBT. We conducted a detailed temporal and spectral analysis of MXB 221014 with GECAM data and find that it is a bright and typical ($T_{90}\sim$250 ms) X-ray burst from this magnetar. Interestingly, we find two narrow X-ray pulses in the MXB, one of which temporally aligns with the main pulse of the FRB 221014 $\sim5.70$ ms latter than the peak time of FRB 221014), resembling the feature found in MXB/FRB 200428. Furthermore, we did comprehensive comparison between MXB/FRB 221014 and MXB/FRB 200428, and find that while the two events share several common features, they also exhibit distinct differences, highlighting the variety of the MXB-FRB association morphology. This finding not only confirms the association between MXB and FRB but also provides new insights into the mechanism of and the relationship between FRB and MXB.

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