Abstract
The Gravitational Wave High-Energy Electromagnetic Counterparts All-sky Monitor (GECAM) is a space mission dedicated to detecting gamma-ray bursts associated with gravitational wave events and various cosmic phenomena. GECAM consists of several satellites, with three currently in orbit and a fourth in the orbital insertion stage. GECAM has yielded numerous scientific discoveries, including observing the brightest gamma-ray burst recorded to date. The compact Gamma-ray Detectors (GRDs) based on silicon photomultipliers (SiPMs) are a crucial component of GECAM, representing the first extensive application of SiPM technology in a spaceborne gamma-ray scientific satellite. This review article first introduces the current status of GECAM and its observational achievements, then focuses on the design and in-flight performance of the gamma-ray detectors, irradiation damage to SiPMs and mitigation strategies, and outlines future plans.
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