The GECAM ground search system for gamma-ray transients  

作　　者：Ce Cai Yan-Qiu Zhang Shao-Lin Xiong Ping Wang Jian-Hui Li Xiao-Bo Li Cheng-Kui Li Yue Huang Shi-Jie Zheng Li-Ming Song Shuo Xiao Qi-Bin Yi Yi Zhao Sheng-Lun Xie Rui Qiao Yan-Qi Du Zhi-Wei Guo Wang-Chen Xue Chao Zheng Jia-Cong Liu Chen-Wei Wang Wen-Jun Tan Yue Wang Jin-Peng Zhang Chao-Yang Li Guo-Ying Zhao Xiao-Yun Zhao Xiao-Lu Zhang Zhen Zhang Wen-Xi Peng Xiang Ma Jing-Yan Shi Dong-Ya Guo Jin Wang Xin-Qiao Li Xiang-Yang Wen Zheng-Hua An Fan Zhang 

机构地区：[1]College of Physics and Hebei Key Laboratory of Photophysics Research and Application,Hebei Normal University,Shijiazhuang,050024,China [2]Key Laboratory of Particle Astrophysics,Institute of High Energy Physics,Chinese Academy of Sciences,Beijing,100049,China [3]University of Chinese Academy of Sciences,Beijing,100049,China [4]School of Physics and Electronic Science,Guizhou Normal University,Guiyang,550001,China [5]Guizhou Provincial Key Laboratory of Radio Astronomy and Data Processing,Guizhou Normal University,Guiyang,550001,China [6]School of Physics and Optoelectronics,Xiangtan University,Xiangtan,411105,China [7]School of Computer and Information,Dezhou University,Dezhou,253023,China [8]Institute of Astrophysics,Central China Normal University,Wuhan,430079,China

出　　处：《Science China(Physics,Mechanics & Astronomy)》2025年第3期161-174,共14页中国科学:物理学、力学、天文学(英文版)

基　　金：supported by the National Natural Science Foundation of China(Grant Nos.12303045,12273042,and 12373047);the National Key R&D Program of China(Grant No.2022YFF0711404);the Strategic Priority Research Program of Chinese Academy of Sciences(Grant Nos.XDA15360102,XDA15360300,and XDA15052700);The GECAM(Huairou-1)mission was supported by the Strategic Priority Research Program on Space Science(Grant No.XDA15360000)of the Chinese Academy of Sciences;the support from the Natural Science Foundation of Hebei Province(Grant No.A2023205020);the Science Foundation of Hebei Normal University(Grant No.L2023B11)。

摘　　要：In the era of time-domain,multi-messenger astronomy,the detection of transient events on the high-energy electromagnetic sky has become more important than ever.The gravitational wave high-energy electromagnetic counterpart all-sky monitor(GECAM)is a dedicated mission to monitor gamma-ray transients,launched in December,2020.A real-time on-board trigger and location software,using the traditional signal-to-noise ratio(SNR)method for blind search,is constrained to relatively bright signals due to the limitations in on-board computing resources and the need for real-time search.In this work,we developed a ground-based pipeline for GECAM to search for various transients,especially for weak bursts missed by on-board software.This pipeline includes both automatic and manual mode,offering options for blind search and targeted search.The targeted search is specifically designed to search for interesting weak bursts,such as gravitational wave-associated gamma-ray bursts(GRBs).From the ground search of the data in the first year,GECAM has been triggered by 54 GRBs and other transients,including soft gamma-ray repeaters,X-ray binaries,solar flares,terrestrial gamma-ray flashes.We report the properties of each type of triggers,such as trigger time and light curves.With this search pipeline and assuming a soft Band spectrum,the GRB detection sensitivity of GECAM is increased to about 1.1×10^(-8)erg cm^(-2)s^(-1)(10-1000 ke V,burst duration of 20 s).These results demonstrate that the GECAM ground search system(both blind search and targeted search)is a versatile pipeline to recover true astrophysical signals which were too weak to be found in the on-board search.

关 键 词：gamma-ray sources gravitational waves data analysis gamma-ray telescopes 

分 类 号：TL816.2[核科学技术—核技术及应用]