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Ground-based calibration and characterization of GRD of GECAM: 8-160 keV

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arxiv 2112.04787 v1 pith:S6ZY5GJ5 submitted 2021-12-09 astro-ph.IM astro-ph.HE

Ground-based calibration and characterization of GRD of GECAM: 8-160 keV

J. J. He , Z. H. An , W. X. Peng , X.Q. Li , S. L. Xiong , D. L. Zhang , R. Qiao , D. Y. Guo
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C. Cai Z. Chang C. Chen G. Chen Y. Y. Du M. Gao R. Gao K. Gong D. J. Hou C. Y. Li G. Li L. Li M. S. Li X. B. Li X. F. Li Y. G. Li X. H. Liang J. C. Liu X. J. Liu Y. Q. Liu H. Lu X. Ma B. Meng F. Shi L. M. Song X. L. Sun C. W. Wang H. Wang H. Z. Wang J. Z. Wang Y. S. Wang X. Wen X. Y. Wen S. Xiao Y. B. Xu Y. P. Xu W. C. Xue J. W. Yang S. Yang Q. B. Yi C. M. Zhang C. Y. Zhang Fan Zhang Fei Zhang P. Zhang S. N. Zhang Y. Q. Zhang X. Y. Zhao Y. Zhao C. Zheng S. J. Zheng X. Zhou Y. Zhu
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classification astro-ph.IM astro-ph.HE
keywords calibrationenergybandcalibratedcrystaldetectiondetectorefficiency
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As the main detector of the GECAM satellite, the calibration of the energy response and detection efficiency of the GRD detector is the main content of the ground-based calibration. The calibration goal requires the calibrated energy points to sample the full energy range (8 keV-2 MeV) as much as possible. The low energy band (8-160 keV) is calibrated with the X-ray beam, while the high energy band (>160 keV) with radioactive sources. This article mainly focuses on the calibration of the energy response and detection efficiency in the 8-160 keV with a refined measurement around the absorption edges of the lanthanum bromide crystal. The GRD performances for different crystal types, data acquisition modes, working modes, and incident positions are also analyzed in detail. We show that the calibration campaign is comprehensive, and the calibration results are generally consistent with simulations as expected.

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