Astronomy and Astrophysics – Astrophysics
Scientific paper
Sep 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006head....9.1347k&link_type=abstract
American Astronomical Society, HEAD meeting #9, #13.47; Bulletin of the American Astronomical Society, Vol. 38, p.374
Astronomy and Astrophysics
Astrophysics
4
Scientific paper
The Burst Alert Telescope (BAT) on the Swift satellite is a large field of view instrument that continually monitors the sky to provide the gamma-ray burst trigger for Swift. An average of more than 70% of the sky is observed on a daily basis. The survey mode data is processed on two sets of time scales: from one minute to one day as part of the transient monitor program, and from one spacecraft pointing ( 20 minutes) to the full mission duration for the hard X-ray survey program.
The transient monitor has recently become public through the web site http://swift.gsfc.nasa.gov/docs/swift/results/transients/. Sky images are processed to detect astrophysical sources in the 15-50 keV energy band and the detected flux or upper limit is calculated for >100 sources on time scales up to one day. Light curves are updated each time that new BAT data becomes available ( 10 times daily). In addition, the monitor is sensitive to an outburst from a new or unknown source. Sensitivity as a function of time scale for catalog and unknown sources will be presented. The daily exposure for a typical source is 1500-3000 seconds, with a 1-sigma sensitivity of 4 mCrab. 90% of the sources are sampled at least every 16 days, but many sources are sampled daily. It is expected that the Swift-BAT transient monitor will become an important resource for the high energy astrophysics community.
Barthelmy Scott D.
Gehrels Neil
Krimm Hans A.
Markwardt Craig B.
Sanwal Divas
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