Space Science Reviews

, Volume 120, Issue 3, pp 143–164

The Burst Alert Telescope (BAT) on the SWIFT Midex Mission

Authors

    • Laboratory for High Energy AstrophysicsNASA Goddard Space Flight Center
  • Louis M. Barbier
    • Laboratory for High Energy AstrophysicsNASA Goddard Space Flight Center
  • Jay R. Cummings
    • Laboratory for High Energy AstrophysicsNASA Goddard Space Flight Center
    • National Research Council
  • Ed E. Fenimore
    • Los Alamos National Laboratory
  • Neil Gehrels
    • Laboratory for High Energy AstrophysicsNASA Goddard Space Flight Center
  • Derek Hullinger
    • Laboratory for High Energy AstrophysicsNASA Goddard Space Flight Center
    • Department of AstronomyUniversity of Maryland
  • Hans A. Krimm
    • Laboratory for High Energy AstrophysicsNASA Goddard Space Flight Center
    • Universities Space Research Association
  • Craig B. Markwardt
    • Laboratory for High Energy AstrophysicsNASA Goddard Space Flight Center
    • Department of AstronomyUniversity of Maryland
  • David M. Palmer
    • Los Alamos National Laboratory
  • Ann Parsons
    • Laboratory for High Energy AstrophysicsNASA Goddard Space Flight Center
  • Goro Sato
    • Institute of Space and Astrononautical Science
    • Department of PhysicsUniversity of Tokyo
  • Masaya Suzuki
    • Institute of Space and Astrononautical Science
    • Department of PhysicsUniversity of Tokyo
  • Tadayuki Takahashi
    • Institute of Space and Astrononautical Science
    • Department of PhysicsUniversity of Tokyo
  • Makota Tashiro
    • Institute of Space and Astrononautical Science
    • Department of PhysicsUniversity of Tokyo
  • Jack Tueller
    • Laboratory for High Energy AstrophysicsNASA Goddard Space Flight Center
Article

DOI: 10.1007/s11214-005-5096-3

Cite this article as:
Barthelmy, S.D., Barbier, L.M., Cummings, J.R. et al. Space Sci Rev (2005) 120: 143. doi:10.1007/s11214-005-5096-3

Abstract

he burst alert telescope (BAT) is one of three 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 s after the start of the event. The GRB trigger initiates an autonomous spacecraft slew to point the two narrow field-of-view (FOV) instruments at the burst location within 20–70 s 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 (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 ∼7 keV resolution, a sensitivity of ∼10−8 erg s−1 cm−2, and a 1.4 sr (half-coded) FOV. We expect to detect > 100 GRBs/year for a 2-year mission. The BAT also performs an all-sky hard X-ray survey with a sensitivity of ∼2 m Crab (systematic limit) and it serves as a hard X-ray transient monitor.

Keywords

gamma-ray GRB hard X-ray survey burst afterglow CZT coded aperture astrophysics cosmology

Copyright information

© Springer Science + Business Media, Inc. 2005