Physics
Scientific paper
May 2004
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004aps..aprs10002m&link_type=abstract
American Physical Society, April Meeting, 2004, May 1-4, 2004, Denver, Colorado April 2004, MEETING ID: APR04, abstract #S10.002
Physics
Scientific paper
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 20 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, in order 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 (4× 4× 2 mm), and the coded-aperture mask is composed of ˜52,000 pieces of lead (5× 5× 1 mm) with a 1 m separation between mask and detector plane. The BAT operates over the 15--150 keV energy range with ˜6 keV resolution, a sensitivity of 0.2 ph cm-2 s-1 and a 1.4 sr (half-coded) FOV. We expect to detect >100 GRBs/yr for a 2 year mission. The BAT also performs an all-sky hard X-ray survey with a sensitivity of ˜2 mCrab (systematic limit) and as a hard X-ray transient monitor.
Gehrels Niel
Markwardt Craig
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