Multi-instrument Search for Gamma-Ray Counterpart of X-Ray Transients Detected by EP/WXT

作者：Yan-Qiu Zhang, Wang-Chen Xue, Jinpeng Zhang, Ce Cai, S. L. Xiong, Cheng-Kui Li, Yuan Liu, Chen-Wei Wang, Hao-Xuan Guo, Shuo Xiao, Wen-Jun Tan, Chao Zheng, Jia-Cong Liu, Sheng-Lun Xie, Peng Zhang, Wen-Long Zhang, Y. Wang, Zheng-Hang Yu, Yang-Zhao Ren, Ping Wang, Yue Huang, Xiaobo Li, Xiao-Yun Zhao, S. J. Zheng, Zhen Zhang, Shu-Xu Yi, L. M. Song, Shuang‐Nan Zhang · 发表于：The Astrophysical Journal Letters · 年份：2025 · DOI：10.3847/2041-8213/ade0aa · 被引用次数：7 · 研究领域：Gamma-ray bursts and supernovae、Pulsars and Gravitational Waves Research、Astrophysics and Cosmic Phenomena

Abstract As a soft X-ray imager with an unprecedentedly large field of view, Einstein Probe (EP)/Wide-field X-ray Telescope (WXT) has detected many (fast) X-ray transients, whose nature is very intriguing. Whether there is a gamma-ray counterpart for the X-ray transient provides important implications for its origin. Some of them have been reported to be associated with gamma-ray bursts; however, a systematic study on the gamma-ray emission of these X-ray transients is lacking. In this work, we implemented a comprehensive targeted search for gamma-ray counterparts to 63 X-ray transients reported by EP/WXT during its first year of operation, using the dedicated multiple-instrument search pipeline, Energetic Transients Joint Analysis System for Multi-Instrument (ETJASMIN), with GECAM-B, GECAM-C, Fermi/GBM, and Insight-HXMT data. We find that 14 out of 63 (22%) EP/WXT X-ray transients have gamma-ray counterparts. For other transients, the ETJASMIN pipeline provided the upper limit of the gamma-ray emission, which is more stringent than that given by an individual instrument. Moreover, we investigated the properties of the X-ray transients and their gamma-ray counterparts and explored the relation between the X-ray transient and the gamma-ray counterpart.