Abstract
ASTRO-E is the fifth Japanese X-ray astronomy satellite scheduled to be launched in year 2000. The satellite will carry three scientific instruments, one of which is the Hard X-ray Detector (HXD). HXD will cover the 10–600 keV band with low background of several×10−6c/s/cm2/keV. This will be achieved by the well-type phoswich counter technique together with large active shield counters of BGO (about 1200 cm2/side), which are also capable to detect GRBs in the 100–2000 keV band. About 100 GRBs are expected to be detected per year with HXD.
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