Performance of GRB monitor with Astro-E2 Hard X-ray Detector (HXD-II)

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The Hard X-ray Detector (HXD-II) is one of the three instruments onboard the Astro-E2 satellite scheduled for launch in 2005. The HXD-II consists of 16 main counters (Well units), surrounded by 20 active shield counters (Anti units). The Anti units have a large geometrical area of ˜ 800 cm2 with an uncollimated field of view covering ˜ 2π steradian. Utilizing 2.6 cm thick BGO crystals, they realize a large effective area of 400 cm2 for 1MeV photons. In the energy range of 300-5000keV, the expected effective area is significantly larger than those of other gamma-ray burst instruments, such as CGRO/BATSE, HETE-2/FREGATE, and GLAST/GBM. Therefore, the Anti units act as a Wideband All-sky Monitor (WAM) for gamma-ray bursts in the energy range of 50-5000keV.

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