We present the first Swift Burst Alert Telescope (BAT) catalog of gamma-ray
bursts (GRBs), which contains bursts detected by the BAT between 2004 December
19 and 2007 June 16. This catalog (hereafter BAT1 catalog) contains burst
trigger time, location, 90% error radius, duration, fluence, peak flux, and
time averaged spectral parameters for each of 237 GRBs, as measured by the BAT.
The BAT-determined position reported here is within 1.75' of the Swift X-ray
Telescope (XRT)-determined position for 90% of these GRBs. The BAT T_90 and
T_50 durations peak at 80 and 20 seconds, respectively. From the
fluence-fluence correlation, we conclude that about 60% of the observed peak
energies, Epeak, of BAT GRBs could be less than 100 keV. We confirm that GRB
fluence to hardness and GRB peak flux to hardness are correlated for BAT bursts
in analogous ways to previous missions' results. The correlation between the
photon index in a simple power-law model and Epeak is also confirmed. We also
report the current status for the on-orbit BAT calibrations based on
observations of the Crab Nebula.Comment: 63 pages, 23 figures, Accepted in ApJS, Corrected for the BAT ground
position, the image significance, and the error radius of GRB 051105, Five
machine-readable tables are available at
http://swift.gsfc.nasa.gov/docs/swift/results/bat1_catalog
