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In-flight Energy Calibration of the GECAM Gamma-Ray Detectors

Rui Qiao,Dong-Ya Guo,Wen-Xi Peng,Yan-Qiu Zhang,Shuo Xiao,Shao-Lin Xiong,Chao Zheng,Chao-Yang Li,Jia-Cong Liu,Wang-Chen Xue,Jian-Jian He,Zheng-Hua An,Da-Li Zhang,Xin-Qiao Li,Li-Ming Song,Shi-Jie Zheng,Ke Gong,Ya-Qing Liu,Xin-Ying Song,Xiao-Yun Zhao,Xiang-Yang Wen,Yan-Bing Xu,Xiang Ma, Xiao-Bo Li,Ping Wang,Yue Huang,Ce Cai,Qi-Bin Yi, Yi Zhao,Chen-Wei Wang

Research in Astronomy and Astrophysics（2024）

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Abstract
The Gravitational wave high-energy Electromagnetic Counterpart All-sky Monitor (GECAM) mission is designed to monitor the Gamma-Ray Bursts (GRBs) associated with gravitational waves and other high-energy transient sources. The mission consists of two microsatellites which are planned to operate at the opposite sides of the Earth. Each GECAM satellite could detect and localize GRBs in about 8 keV-5 MeV with its 25 Gamma-Ray Detectors (GRDs). In this work, we report the in-flight energy calibration of GRDs using the characteristic gamma-ray lines in the background spectra, and show their performance evolution during the commissioning phase. Besides, a preliminary cross-calibration of energy response with Fermi GBM data is also presented, validating the energy response of GRDs.
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Key words
(stars:) gamma-ray burst: general,instrumentation: detectors,methods: data analysis
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