TITLE: GCN CIRCULAR NUMBER: 15074 SUBJECT: SGR 1745-29 (Swift trigger 565443), Swift-BAT refined analysis DATE: 13/08/06 12:14:47 GMT FROM: Jay R. Cummings at NASA/GSFC/Swift H. A. Krimm (GSFC/USRA), S. D. Barthelmy (GSFC), W. H. Baumgartner (GSFC/UMBC), J. R. Cummings (GSFC/UMBC), E. E. Fenimore (LANL), N. Gehrels (GSFC), A. Y. Lien (NASA/GSFC/ORAU), C. B. Markwardt (GSFC), D. M. Palmer (LANL), T. Sakamoto (AGU), G. Sato (ISAS), M. Stamatikos (OSU), J. Tueller (GSFC), T. N. Ukwatta (MSU) (i.e. the Swift-BAT team): Using the data set from T-120 to T+182 sec from the recent telemetry downlink, we report further analysis of the burst from SGR 1745-29 (trigger #565443) (Barthelmy, et al., GCN Circ. 15069). The BAT ground-calculated position is RA, Dec = 266.403, -29.017 deg which is RA(J2000) = 17h 45m 36.8s Dec(J2000) = -29d 01' 02.3" with an uncertainty of 1.9 arcmin, (radius, sys+stat, 90% containment). The partial coding was 100%. The mask-weighted light curve shows a single peak with some substructure at low significance. T90 (15-350 keV) is 0.011 +- 0.002 sec (estimated error including systematics). The time-averaged spectrum from T+0.00 to T+0.01 sec is best fit by functions exponentially declining with energy in the BAT energy range. A blackbody fit is formally the best fit with kT = 8.9 +/- 0.2. A simple powerlaw fit has a power law index of the time-averaged spectrum of 2.54 +- 0.26. The fluence in the 15-150 keV band is 9.2 +- 1.6 x 10^-09 erg/cm2. The 1-sec peak photon flux measured from T+0.00 sec in the 15-150 keV band is 22.1 +- 3.6 ph/cm2/sec. All the quoted errors are at the 90% confidence level. The results of the batgrbproduct analysis are available at http://gcn.gsfc.nasa.gov/notices_s/565443/BA/