Oral Presentation
The Gamma-ray Transients Monitor (GTM) on board Formosat-8B
Presenter: Chien-You Huang (National Tsing Hua University)
Gamma Ray Bursts (GRBs) were discovered more than half a century ago. Their nature remained highly mysterious since then until the detection of their multi-wavelength afterglows and host galaxies in late 90’s, which eventually allowed to measure the redshift of GRBs and to establish their cosmological distance scale. These advances were based on extensive efforts of GRB monitoring and follow-up observations. The Gamma-ray Transients Monitor (GTM) on board Formosat-8B (FS-8B) will join this effort to monitor GBRs in the energy band from 50 keV to 2 MeV. GTM consists of two identical modules located on two opposite sides of FS-8B. Each module has four sensor units facing different directions to cover half of the sky. The two modules will then cover the whole sky, including the direction occulted by the Earth. Each sensor unit is composed of a GAGG scintillator array (50 mm × 50 mm × 8 mm) to be readout by SiPM with 16 pixel-channels. GTM will enhance the sky coverage of current missions in the world and provide independent event localization measurement. It is expected to launch in 2026 and to detect about 50 GRBs per year.
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