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Proceedings Paper

Swift/BAT calibration and the estimated BAT hard x-ray survey sensitivity
Author(s): Ann M. Parsons; Jack Tueller; Hans Krimm; Scott D. Barthelmy; James Cummings; Craig Markwardt; Derek Hullinger; Neil Gehrels; Ed Fenimore; David Palmer; Goro Sato; Kazuhiro Nakazawa; Tadayuki Takahashi; Shin Watanabe; Yuu Okada; Hiromitsu Takahashi; Masaya Suzuki; Makoto Tashiro
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Paper Abstract

In addition to providing the initial gamma-ray burst trigger and location, the Swift Burst Alert Telescope (BAT) will also perform an all-sky hard x-ray survey based on serendipitous pointings resulting from the study of gamma-ray bursts. BAT was designed with a very wide field-of-view (FOV) so that it can observe roughly 1/7 of the sky at any time. Since gamma-ray bursts are uniformly distributed over the sky, the final BAT survey coverage is expected to be nearly uniform. BAT's large effective area and long sky exposures will produce a 15 - 150 keV survey with up to 30 times better sensitivity than any previous hard x-ray survey (e.g. HEAO A4). Since the sensitivity of deep exposures in this energy range is systematics limited, the ultimate survey sensitivity depends on the relative sizes of the statistical and systematic errors in the data. Many careful calibration experiments were performed at NASA/Goddard Space Flight Center to better understand the BAT instrument's response to 15-150 keV gamma-rays incident from any direction within the FOV. Using radioactive sources of gamma-rays with known locations and energies, the Swift team can identify potential systematic errors in the telescope's performance and estimate the actual Swift hard x-ray survey sensitivity in flight. These calibration results will be discussed and a preliminary parameterization of the BAT instrument response will be presented. While the details of the individual BAT CZT detector response will be presented elsewhere in these proceedings, this talk will focus on the translation of the calibration experimental data into overall hard x-ray survey sensitivity.

Paper Details

Date Published: 3 February 2004
PDF: 11 pages
Proc. SPIE 5165, X-Ray and Gamma-Ray Instrumentation for Astronomy XIII, (3 February 2004); doi: 10.1117/12.506309
Show Author Affiliations
Ann M. Parsons, NASA Goddard Space Flight Ctr. (United States)
Jack Tueller, NASA Goddard Space Flight Ctr. (United States)
Hans Krimm, NASA Goddard Space Flight Ctr. (United States)
Universities Space Research Association (United States)
Scott D. Barthelmy, NASA Goddard Space Flight Ctr. (United States)
James Cummings, NASA Goddard Space Flight Ctr. (United States)
Universities Space Research Association (United States)
Craig Markwardt, NASA Goddard Space Flight Ctr. (United States)
Univ. of Maryland/College Park (United States)
Derek Hullinger, NASA Goddard Space Flight Ctr. (United States)
Univ. of Maryland/College Park (United States)
Neil Gehrels, NASA Goddard Space Flight Ctr. (United States)
Ed Fenimore, Los Alamos National Lab. (United States)
David Palmer, Los Alamos National Lab. (United States)
Goro Sato, Institute of Space and Astronautical Science (Japan)
Kazuhiro Nakazawa, Institute of Space and Astronautical Science (Japan)
Tadayuki Takahashi, Institute of Space and Astronautical Science (Japan)
Shin Watanabe, Institute of Space and Astronautical Science (Japan)
Yuu Okada, Univ. of Tokyo (Japan)
Hiromitsu Takahashi, Univ. of Tokyo (Japan)
Masaya Suzuki, Saitama Univ. (Japan)
Makoto Tashiro, Saitama Univ. (Japan)


Published in SPIE Proceedings Vol. 5165:
X-Ray and Gamma-Ray Instrumentation for Astronomy XIII
Kathryn A. Flanagan; Oswald H. W. Siegmund, Editor(s)

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