The Burst Alert Telescope (BAT) on the Swift MIDEX mission

The Burst Alert telescope (BAT) is one of 3 instruments on the Swift MIDEX spacecraft to study gamma-ray bursts (GRBs). The BAT instrument is the instrument that first detects the GRB and localizes the burst direction to an accuracy of 1-4 arcmin within 10 sec after the start of the event. These locations cause the spacecraft to autonomously slew to point the two narrow-FOV instruments at the burst location within 20-70 sec to make follow-up x-ray and optical observations. BAT is a wide-FOV coded-aperture instrument with a CdZnTe detector plane. The detector plane is composed of 32,768 pieces of CdZnTe (4x4x2mm), and the coded-aperture mask is composed of similar to 50,000 pieces of lead (5x5x1mm) with a 1-m separation between mask and detector plane. The BAT operates over the 10-150 keV energy range with similar to7 keV resolution, a sensitivity of 0.2 ph/cm(2)-sec, and a 1.4 sr (half-coded) FOV. We expect to detect similar to 300 GRBs/yr for a 3-year mission. The BAT also performs an all-sky hard x-ray survey with a sensitivity of similar to1 mCrab (systematic limit) and as a hard x-ray transient monitor.