TITLE: GCN GRB OBSERVATION REPORT NUMBER: 5370 SUBJECT: GRB 060729: Refined analysis of the Swift-BAT burst DATE: 06/07/30 05:37:16 GMT FROM: Scott Barthelmy at NASA/GSFC A. Parsons (GSFC), L. Barbier (GSFC), S. D. Barthelmy (GSFC), J. Cummings (GSFC/ORAU), E. Fenimore (LANL), N. Gehrels (GSFC), D. Grupe (PSU), D. Hullinger (BYU-Idaho), H. Krimm (GSFC/USRA), M. Koss (GSFC/UMD), C. Markwardt (GSFC/UMD), D. Palmer (LANL), T. Sakamoto (GSFC/ORAU), G. Sato (GSFC/ISAS), M. Stamatikos (GSFC/ORAU), J. Tueller (GSFC) on behalf of the Swift-BAT team: Using the data set from T-240 to T+742 sec from recent telemetry downlinks, we report further analysis of BAT GRB 060729 (trigger #221755) (Grupe, et al., GCN Circ. 5365). The BAT ground-calculated position is RA,Dec = 95.288, -62.221 deg {6h 21m 9.1s, -62d 13' 16.3"} (J2000) +- 4.0 arcmin, (radius, sys+stat, 90% containment). The partial coding was 18%. The mask-weighted lightcurve 4 main peaks. The first starts at T-2 sec and ends at T+10 with a peak at T+2 sec. The second, somewhat smaller peak goes from T+20 to T+26 sec. Then come two overlapping peaks that start at T+70 sec and end at roughly T+135 sec with peaks at T+80 and T+93 sec. There is no significant indication of any emission at the time of the flare listed in Grupe et al., GCN Circ 5369 (T+174 sec). T90 (15-350 keV) is 116 +- 10 sec (estimated error including systematics). The time-averaged spectrum from T+1 to T+132 is best fit by a simple power-law model. The power law index of the time-averaged spectrum is 1.86 +- 0.14. The fluence in the 15-150 keV band is 2.7 +- 0.2 x 10^-6 erg/cm2. The 1-sec peak photon flux measured from T+91.97 sec in the 15-150 keV band is 1.4 +- 0.2 ph/cm2/sec. All the quoted errors are at the 90% confidence level.