The Swift BAT Slew Survey (BATSS) for High z GRBs

Details The Swift BAT Slew Survey (BATSS) for High z GRBs The Swift BAT Slew Survey (BATSS) for High z GRBs

Sep 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006head....9.1317c&link_type=abstract

American Astronomical Society, HEAD meeting #9, #13.17; Bulletin of the American Astronomical Society, Vol. 38, p.369

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The BAT instrument on Swift is the large area, wide-field hard X-ray imager for discovering GRBs (and transient as well as persistent sources) to conduct the primary mission science. Its 1.4sr (50% coded fraction) field of view covers 60-70% of the full sky on a typical day of pointings on 10 targets (previous GRBs under study as well as targeted sources) while waiting for the next GRB to then initiate a rapid slew of the narrow-field telescopes (XRT and UVOT) for precise GRB location and spectral studies. A typical Swift day then includes 60 such rapid ( 60-100sec) slews which combined cover 80-90% of the sky with typically any given point covered 6-10 times. As of now (July, 2006) BAT data has not been telemetered down during slews except for those initiated by a GRB trigger ( 2 per week). We report extensive simulations and analysis of existing GRB slews, which include "event mode" time-tagged BAT photon data, on the prospects for a BAT Slew Survey (BATSS) which would increase the probability of detection of GRBs, and especially long GRBs, by 10-30%, particularly for GRBs with durations T90 ≥ 100-500sec . Since the highest redshift GRBs will be observed to have the longest durations, BATSS will be particularly effective for increasing the yield for GRBs with redshifts larger than the current record, z = 6.3, and thus extending the hunt for the GRB holy grail: the birth of stellar black holes from Pop III stars. BATSS will also be effective for transients and fast-timing studies of (bright) sources, since it could provide 1h/day of high time-resolution survey data as well as extend the coverage of the BAT sky survey.

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