AAS 205th Meeting, 9-13 January 2005
Session 160 GRBs: Observatories and Observations
Oral, Thursday, January 13, 2005, 10:00-11:30am, Pacific Salon 1

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[160.01] The Swift-BAT Instrument -- Initial On-Orbit Performance

S.D. Barthelmy (NASA-GSFC), Swift/BAT Instrument Team

The Burst Alert Telescope (BAT) is one of 3 instruments on the Swift MIDEX spacecraft to study gamma-ray bursts (GRBs). The BAT 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. The GRB trigger initiates an autonomous spacecraft slew to point the two narrow-FOV instruments at the burst location within 20-70 sec so to make follow-up x-ray and optical observations. The 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 ~52,000 pieces of lead (5x5x1mm) 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/cm2-sec, 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 it serves as a hard x-ray transient monitor. We will present the current status of BAT after the launch and some of its on-orbit performamnce.

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© 2004. The American Astronomical Society.