Statistics
Scientific paper
Mar 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008head...10.0701k&link_type=abstract
American Astronomical Society, HEAD meeting #10, #7.01
Statistics
Scientific paper
The Hard X-ray Transient Monitor of the Burst Alert Telescope (BAT) on the Swift satellite has been running as a public resource since October 2006. It tracks the 15-50 keV light curves of more than 500 galactic and extra-galactic sources on time scales from a few minutes to a day. Of the sources monitored, 65 are detectable in a day's observations or are periodic, and another 49 have had one or more outbursts (to above 30 mcrab) during the Swift mission, 18 of which have been announced as an Astronomer's Telegram. Light curves are automatically updated each time that new BAT data becomes available ( 10 times daily). The daily exposure for a typical source is 9000 seconds, with a 1-sigma sensitivity of 7 mCrab. In addition to monitoring known sources, the Transient Monitor is capable of making new discoveries, including SWIFT J1756.9-2508, the eighth known transient accretion-powered millisecond pulsar. A summary of results and observing statistics will be presented, along with recent improvements to the monitoring program including more rapid identification of new sources and accumulation of light curves on time scales of longer than a day, which will make the monitor more sensitive to weak sources with slow variability.
Barthelmy Scott D.
Cummings Jay R.
Krimm Hans A.
Markwardt Craig B.
Skinner Gerald
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