Journal
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
Volume 525, Issue 3, Pages 3399-3412Publisher
OXFORD UNIV PRESS
DOI: 10.1093/mnras/stad2439
Keywords
instrumentation: detectors; methods: data analysis; site testing; space vehicles: instruments; telescopes
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This study focuses on the calibration of the energy response and detection efficiency of the gamma-ray detector in the Gravitational wave high-energy Electromagnetic Counterpart All-sky Monitor mission. The calibration results show that the detector meets the flight requirements and agrees with simulations.
As the main detector of the Gravitational wave high-energy Electromagnetic Counterpart All-sky Monitor mission (GECAM), the calibration of the energy response and detection efficiency of the gamma-ray detector (GRD) is the main content of the ground-based calibration. 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 (LaBr3). The GRD performances for different crystal types, data acquisition modes, working modes, and incident positions are also analysed in detail. We show that the calibration campaign is comprehensive, the detector performance meets the flight requirements, and the calibration results generally agree with simulations as expected. The detector's model was corrected by the ground-based calibration, which led to the establishment of the calibration data base.
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