GECAM Detection of a Bright Type I X-Ray Burst from 4U 0614+09: Hint for Its Spin Frequency at 413 Hz

作者：Chen, Yu-Peng; Li, Jian; Xiong, Shao-Lin; Ji, Long; Zhang, Shu; Peng, Wen-Xi; Qiao, Rui; Li, Xin-Qiao; Wen, Xiang-Yang; Song, Li-Ming; Zheng, Shi-Jie; Song, Xin-Ying; Zhao, Xiao-Yun; Huang, Yue; Lu, Fang-Jun; Zhang, Shuang-Nan; Xiao, Shuo; Cai, Ce; An, Zheng-Hua; Chang, Zhi; Chen, Can; Chen, Gang; Chen, Wei; Dai, Guang-Qi; Du, Yan-Qi; Gao, Min; Gong, Ke; Guo, Dong-Ya; Guo, Zhi-Wei; He, Jian-Jian; Li, Bin; Li, Chao; Li, Chao-Yang; Li, Gang; Li, Jian-Hui; Li, Lu; Li, Qing-Xin; Li, Xiao-Bo

来源：Astrophysical Journal, 2022, 935(1): 10.

DOI：10.3847/1538-4357/ac7ff8

• NEUTRON-STAR
• DISCOVERY
• 4U-0614+09

One month after launching the Gravitational Wave High-energy Electromagnetic Counterpart All-sky Monitor, a bright thermonuclear X-ray burst from 4U 0614+09 was observed on 2021 January 24. We report the time-resolved spectroscopy of the burst and a hint of burst oscillation at 413 Hz with a fractional amplitude similar to 2.0% (rms). This coincides with the burst oscillation previously discovered with Swift/Burst Alert Telescope (Strohmayer et al. 2008), and therefore supports the spin frequency of this source. This burst is a bright one in the normal bursts detected from 4U 0614+09, which leads to an upper limit of distance estimation of 3.1 kpc. The folded light curve during the burst oscillation shows a sinusoidal structure, which is consistent with previous observations.

• 单位
  中国科学院; 西南交通大学; 湘潭大学; 中国科学院研究生院; 中山大学