Cross-calibration of the energy response of the gamma-ray detectors on board GECAM-B

作者：Yanqiu Zhang, Chao Zheng, S. L. Xiong, Rui Qiao, Zhenghua An, Xinqiao Li, D. Y. Guo, Wen-Xi Peng, Ce Cai, Shuo Xiao, Wang-Chen Xue, Jia-Cong Liu, Chen-Wei Wang, Ping Wang, Y. Zhao, Qi-Bin Yi, Sheng-Lun Xie, Y. Huang, Xiao‐Bo Li, Xiaoyun Zhao, Zhen Zhang, S. J. Zheng, Jin Wang, Xiang-Yang Wen, Dali Zhang, Xi-Lei Sun, Ya-Qing Liu, KeWei Gong, Xiaojing Liu, Sheng Yang, M. Gao, Jinzhou Wang, L. M. Song, Fan Zhang · 发表于：Astronomy and Astrophysics · 年份：2025 · DOI：10.1051/0004-6361/202555228 · 被引用次数：4 · 研究领域：Nuclear Physics and Applications、Radiation Detection and Scintillator Technologies、Radiation Therapy and Dosimetry

Context . The Gravitational-wave high-energy Electromagnetic Counterpart All-sky Monitor (GECAM) was primarily designed to detect gamma-ray bursts (GRBs), particularly those associated with gravitational-wave events. The energy response of detectors plays a crucial role in detection performance and scientific data analysis. Aims . We applied the cross-calibration methodology to calibrate and optimize the energy response of the gamma-ray detectors (GRDs) on board GECAM-B, using eight GRBs that were jointly observed by GECAM-B and other well-calibrated instruments. These GRBs enable the comprehensive calibration of all GRDs with different incident angles. Methods . Cross-calibration using well-calibrated instruments is the most efficient way to verify the energy response of the detectors. The basic approach involves performing a joint spectral analysis and introducing a constant factor to quantify the difference in effective area between instruments. This calibration method has been widely used in the cross-calibration of many high-energy astrophysical instruments. Results . We completed the cross-calibration of all 25 GRDs, covering two electronics readout channels and different incidence angles. The results of the joint spectral fitting demonstrate that GECAM-B exhibits good consistency with the well-calibrated Fermi /GBM instrument. Furthermore, the GECAM-B energy response matrix accurately reproduces the observational data without requiring any corrections or modifications....