Speaker
Description
The Gamma-ray Transients Monitor (GTM) is a secondary payload on board Formosat-8B (FS-8B), scheduled for launch in 2026. It aims to monitor Gamma-ray Bursts (GRBs) and other bright gamma-ray transients in the energy range from 50 keV to 2 MeV. GTM consists of two units, each containing four sensor modules, mounted on opposite sides of FS-8B. With each unit covering one celestial hemisphere, GTM enables all-sky monitoring, including regions occulted by the Earth. In this study, we present the refined GTM localization algorithm, which enhances previous constraints on spectrum model parameters by simultaneously fitting both the source’s location and spectrum with ad hoc simulations. Employing the gradient descent method and the chi-squared test, the algorithm identifies the best-fit solution upon meeting a defined termination criterion and reports the localization result with a 3-sigma confidence level. This refined localization framework can also be applied to the Gamma-ray Polarimeter and Monitor (GPM) on board Formosat-8D, developed by the GTM team, or to other gamma-ray monitors with similar technical specifications.
| Participate the oral/poster presentation award competition | Yes |
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