Year: 2026
Type: article
Abstract: The Gamma-Ray Monitor (GRM) is a key scientific payload onboard the Space-based multi-band Variable Objects Monitor (SVOM) satellite, designed specifically for the detection and study of gamma-ray bursts (GRBs). Launched into a 625 km low-Earth orbit on 2024 June 22, GRM serves as a large-area, wide-field-of-view instrument capable of observing the hard X-ray and soft gamma-ray emissions in the energy range of 15 keV–5 MeV. Its primary scientific objectives include: promptly triggering and localizing GRBs (with particular sensitivity to short-hard GRBs), measuring spectral and temporal properties of bursts, monitoring charged particle fluxes in orbit. GRM successfully detected its first GRB (GRB 240627B) on 2024 June 27, and has since maintained a detection rate of more than 100 GRBs per year. Cross-instrument comparisons with detectors such as GECAM and Fermi/GBM have validated the performance and data quality of GRM. This paper provides a comprehensive overview of GRM instrument design, reliability verification through ground testing, in-orbit triggering and localization algorithms, performance calibration, and preliminary in-orbit results, demonstrating its capability as a versatile gamma-ray all-sky monitor.
Authors: Jian-Chao Sun, Yong-Wei Dong, Jiang He, Jiang-Tao Liu, Lu Li, Rui-Jie Wang, Xin Liu, Li Zhang, Min Gao, Yue Huang, Hao-Li Shi, Li-Ming Song, Wen-Jun Tan, Chen-Wei Wang, Jin Wang, Jin-Zhou Wang, Ping Wang, Xing Wen, Bo-Bing Wu, Shao-Lin Xiong, Juan Zhang, Shuang-Nan Zhang, Xiao-Yun Zhao, Shi-Jie Zheng
Language: English
Subfield: Astronomy and Astrophysics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: green
Funders: National Natural Science Foundation of China, Chinese Academy of Sciences, Centre National d’Etudes Spatiales, Nuclear Safety and Security Commission, Centre National de la Recherche Scientifique, Xi'an Institute of Optics and Precision Mechanics, Institute of High Energy Physics, National Astronomical Observatories, Chinese Academy of Sciences
OpenAlex ID: W7162988065