GECAM Observations of the Galactic Magnetar SGR J1935+2154 during the 2021 and 2022 Burst Active Episodes. I. Burst Catalog

作     者：Xie, Sheng-Lun Cai, Ce Yu, Yun-Wei Xiong, Shao-Lin Lin, Lin Zhao, Yi Zhang, Shuang-Nan Song, Li-Ming Wang, Ping Li, Xiao-Bo Xue, Wang-Chen Zhang, Peng Zheng, Chao Zhang, Yan-Qiu Liu, Jia-Cong Wang, Chen-Wei Tan, Wen-Jun Wang, Yue Yu, Zheng-Hang Feng, Pei-Yi Zhang, Jin-Peng Xiao, Shuo Zhao, Hai-Sheng Zhang, Wen-Long Zhang, Yan-Ting Huang, Yue Zhao, Xiao-Yun Ma, Xiang Zheng, Shi-Jie Li, Xin-Qiao Wen, Xiang-Yang Gong, Ke An, Zheng-Hua Zhang, Da-Li Yang, Sheng Liu, Xiao-Jing Zhang, Fan 

作者机构：Institute of Astrophysics Central China Normal University Wuhan430079 China Key Laboratory of Particle Astrophysics Institute of High Energy Physics Chinese Academy of Sciences 19B Yuquan Road Beijing100049 China College of Physics Hebei Key Laboratory of Photophysics Research and Application Hebei Normal University Hebei Shijiazhuang050024 China Department of Astronomy Beijing Normal University Beijing100088 China School of Computer and Information Dezhou University Dezhou253023 China University of Chinese Academy of Sciences Beijing100049 China College of Electronic and Information Engineering Tongji University Shanghai201804 China Guizhou Provincial Key Laboratory of Radio Astronomy and Data Processing Guizhou Normal University Guiyang550001 China School of Physics and Physical Engineering Qufu Normal University Shandong Qufu273165 China 

出 版 物：《arXiv》 (arXiv)

年 卷 期：2023年

核心收录：

主　　题：Galaxies 

摘      要：Magnetar is a neutron star with an ultrahigh magnetic field (∼ 1014 − 1015 G). The magnetar SGR J1935+2154 is not only one of the most active magnetars detected so far, but also the unique confirmed source of fast radio bursts (FRBs). Gravitational wave high-energy Electromagnetic Counterpart All-sky Monitor (GECAM) is dedicated to monitor gamma-ray transients all over the sky, including magnetar short bursts. Here we report the GECAM observations of the burst activity of SGR J1935+2154 from January 2021 to December 2022, which results in a unique and valuable data set for this important magnetar. With a targeted search of GECAM data, 159 bursts from SGR J1935+2154 are detected by GECAM-B while 97 bursts by GECAM-C, including the X-ray burst associated with a bright radio burst. We find that both the burst duration and the waiting time between two successive bursts follow lognormal distributions. The period of burst activity is 134 ± 20 days, thus the burst activity could be generally divided into four active episodes over these two years. Interestingly, the hardness ratio of X-ray bursts tends to be softer during these two years, especially during the active episode with radio bursts detected. © 2023, CC BY.