Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002aas...201.4113h&link_type=abstract
American Astronomical Society, 201st AAS Meeting, #41.13; Bulletin of the American Astronomical Society, Vol. 34, p.1166
Astronomy and Astrophysics
Astronomy
Scientific paper
The Burst Alert Telescope (BAT), one of a trio of instruments aboard the Swift Gamma-ray Burst Explorer, will provide burst triggers and positions as well as light curves and spectra between 15 and 150 keV. BAT is a coded aperture telescope with a wide (2 steradian) field of view. It consists of an array of 32,768 CdZnTe gamma ray detectors, each 4 mm x 4 mm x 2 mm, lying 1 meter below a coded mask of lead tiles. Raw BAT data will consist of counts recorded in three basic dimensions: time, detector plane position (pixel), and detector deposited energy. The counts recorded in the detector array are modulated by the coded mask, producing an image in the detector plane that can be transformed into a position on the sky. In order to produce the instrument response for this image, it is necessary to separate the mask-modulated portion of the detector plane counts (which contribute to the image) from the unmodulated portion resulting from scattering (which contribute to the background). Generating this instrument response requires both monte carlo simulations (to help separate background counts from those that form the image) and careful ground calibration to measure detector-specific properties such as charge-transport properties, threshold, ADC units-to-deposited energy conversion, and electronics noise, as well as for checking the monte carlo results. Techniques and results from these simulations and calibration measurements will be presented.
Barthelmy Scott
Cummings Jay
Fenimore Edward E.
Gehrels Neil
Hullinger Derek D.
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