Using the Active Anti-Coincidence Shield of EXIST to Measure Gamma-Ray Burst Energy Spectra in the 500 keV to 20 MeV Energy Range
Trey Garson
Washington University
torgerchopper@yahoo.com
Additional authors: Henric Krawczynski (Washington University in St. Louis)
The road map of the NASA theme Structure and Evolution of the Universe recommends an Einstein probe, to conduct an all-sky survey for black holes. The mission concept of EXIST (Energetic X-Ray Imaging Survey Telescope) foresees an 8 square meter large area detector of between 0.5 cm and 1 cm thick Cadmium Zinc Telluride (CZT) detector to register hard X-rays in the energy region from 10 keV to 600 keV. A partially or fully active anti-coincidence shield with a total area of between 15 and 35 square meter will be used to define the field of view of the CZT detectors and to suppress the background of Cosmic Ray induced events. In this contribution, we present first results of a GEANT 4 simulation study in which we evaluate the capabilities to use the active anti-coincidence shield to detect Gamma-Ray Bursts (GRBs) and to measure their energy spectra in the energy range from 500 keV up to 20 MeV.
