GECAM discovery of the second FRB-associated magnetar X-ray burst from SGR J1935+2154

作者：Chen-Wei Wang, S. L. Xiong, Y. P. Wang, Wenjun Tan, X. F. Li, D. Li, Yan-Qiu Zhang, Shu-Xu Yi, Ming-Yu Ge, Sheng-Lun Xie, W. C. Xue, B. Li, Cheng-Kui Li, Zhenghua An, Ce Cai, Pei-Yi Feng, Min Gao, Ke Gong, D. Y. Guo, Hao-Xuan Guo, Yue Huang, Jia-Cong Liu, Xinqiao Li, Yaqing Liu, Xiaojing Liu, Xiang Ma, Wenxi Peng, Rui Qiao, Yukun Ren, L. M. Song, Xi-Lei Sun, Jin Wang, Jinzhou Wang, P. F. Wang, Xiang-Yang Wen, Shuo XIAO, Sheng Yang, Qi-Bin Yi, Zheng-Hang Yu, Dali Zhang, Fan Zhang, Wen-Long Zhang, J. B. Zhang, P Zhang, Shuang-Nan Zhang, Zhen Zhang, Xiao‐Yun Zhao, Yi Zhao, Chao Zheng, S. J. Zheng · 发表于：Monthly Notices of the Royal Astronomical Society · 年份：2026 · DOI：10.1093/mnras/stag312 · 被引用次数：4 · 研究领域：Pulsars and Gravitational Waves Research、Gamma-ray bursts and supernovae、Astrophysical Phenomena and Observations

ABSTRACT 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 ($\rm {\sim} 7.6\times 10^{-7}\, erg \cdot cm^{-2}$ in 1–250 keV) magnetar X-ray burst detected by Gravitational wave high-energy Electromagnetic Counterpart All-sky Monitor (GECAM) on 2022 October 14 (dubbed as MXB 221014) from SGR J1935+2154, which is associated with an FRB detected by Canadian Hydrogen Intensity Mapping Experiment and Green Bank Telescope. 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 ${\sim} 5.70$ 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...