Space Science Reviews

, Volume 120, Issue 3, pp 143–164

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

  • Scott D. Barthelmy
  • Louis M. Barbier
  • Jay R. Cummings
  • Ed E. Fenimore
  • Neil Gehrels
  • Derek Hullinger
  • Hans A. Krimm
  • Craig B. Markwardt
  • David M. Palmer
  • Ann Parsons
  • Goro Sato
  • Masaya Suzuki
  • Tadayuki Takahashi
  • Makota Tashiro
  • Jack Tueller
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-rayGRBhard X-raysurveyburstafterglowCZTcoded apertureastrophysicscosmology

Copyright information

© Springer Science + Business Media, Inc. 2005

Authors and Affiliations

  • Scott D. Barthelmy
    • 1
  • Louis M. Barbier
    • 1
  • Jay R. Cummings
    • 1
    • 2
  • Ed E. Fenimore
    • 3
  • Neil Gehrels
    • 1
  • Derek Hullinger
    • 1
    • 4
  • Hans A. Krimm
    • 1
    • 5
  • Craig B. Markwardt
    • 1
    • 4
  • David M. Palmer
    • 3
  • Ann Parsons
    • 1
  • Goro Sato
    • 6
    • 7
  • Masaya Suzuki
    • 6
    • 7
  • Tadayuki Takahashi
    • 6
    • 7
  • Makota Tashiro
    • 6
    • 7
  • Jack Tueller
    • 1
  1. 1.Laboratory for High Energy AstrophysicsNASA Goddard Space Flight CenterGreenbelt
  2. 2.National Research CouncilWashington
  3. 3.Los Alamos National LaboratoryLos Alamos
  4. 4.Department of AstronomyUniversity of MarylandCollege Park
  5. 5.Universities Space Research AssociationColumbia
  6. 6.Institute of Space and Astrononautical ScienceKanagawaJapan
  7. 7.Department of PhysicsUniversity of TokyoTokyoJapan