Description
The Gravitational wave high-energy Electromagnetic Counterparts All-sky Monitor (GECAM) project is the planned China’s space telescopes launched in 2020 for searching gamma-rays from gravitational wave events such as double neutron stars merging. GECAM features instantaneous full-sky monitor with two micro-satellites, which can be achieved with relatively short time and small cost based on China’s space technology. A compact low threshold gamma-ray detector composed of LaBr3 crystals and Silicon Photomultipliers (SiPMs) was successfully developed, which energy threshold, size, and power consumption can meet the requirements of GECAM. A prototype, φ76×15 mm LaBr3 crystal coupled with SiPMs array, has been built and tested. The experiment results show, low-energy 5.9 keV X-ray can be clearly seen at the energy spectrum with a detection efficiency 72%, the energy resolution is 6.5% (FWHM) at 662 keV and the read out method is simple with only one parallel channel.
