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

Y. P. Chen,J. Li,S. L. Xiong,L. Ji,S. Zhang,W. X. Peng,R. Qiao,X. Q. Li,X. Y. Wen,L. M. Song,S. J. Zheng,X. Y. Song,X. Y. Zhao,Y. Huang,F. J. Lu,S. N. Zhang,S. Xiao,C. Cai,B. X. Zhang,Z. H. An,C. Chen,G. Chen,W. Chen, G. Q. Dai,Y. Q. Du,M. Gao,K. Gong,D. Y. Guo,Z. W. Guo,J. J. He,B. Li,C. Li,C. Y. Li,G. Li,J. H. Li,L. Li,Q. X. Li,X. B. Li,Y. G. Li,J. Liang,X. H. Liang,J. Y. Liao,J. C. Liu,X. J. Liu,Y. Q. Liu,Q. Luo,X. Ma,B. Meng,G. Ou,D. L. Shi,F. Shi,J. Y. Shi,G. X. Sun,X. L. Sun,Y. L. Tuo,C. W. Wang,H. Wang,H. Y. Wang,J. Wang,J. Z. Wang,P. Wang,Y. S. Wang, Y. X. Wang,X. Wen,H. Wu,S. L. Xie,Y. B. Xu,Y. P. Xu,W. C. Xue,S. Yang,M. Yao,J. Y. Ye,Q. B. Yi,C. M. Zhang,C. Y. Zhang,D. L. Zhang,Fan Zhang,Fei Zhang,H. M. Zhang,K. Zhang,P. Zhang,X. L. Zhang,Y. Q. Zhang,Z. Zhang,G. Y. Zhao,S. Y. Zhao,Y. Zhao,C. Zheng,X. Zhou,Y. Zhu

ASTROPHYSICAL JOURNAL（2022）

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Abstract
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.
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Key words
spin frequency,detection,x-ray
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