TITLE: GCN CIRCULAR NUMBER: 5660 SUBJECT: GRB 060929, Swift-BAT refined analysis DATE: 06/09/30 00:11:46 GMT FROM: Scott Barthelmy at NASA/GSFC E. Fenimore (LANL), L. Barbier (GSFC), S. D. Barthelmy (GSFC), J. Cummings (GSFC/UMBC), N. Gehrels (GSFC), D. Hullinger (BYU-Idaho), H. Krimm (GSFC/USRA), C. Markwardt (GSFC/UMD), D. Palmer (LANL), A. Parsons (GSFC), 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+321 sec from recent telemetry downlinks, we report further analysis of BAT GRB 060929 (trigger #231702) (Markwardt, et al., GCN Circ. 5654). The BAT ground-calculated position is RA,Dec = 263.158, 29.846 deg {17h 32m 37.9s, 29d 50' 44.3"} (J2000) +- 1.9 arcmin, (radius, sys+stat, 90% containment). The partial coding was 84%. The mask-weighted lightcurve shows a roughly triangular shaped peak starting at T-5 sec, peaking at T+3 sec, and ending at T+9 sec. T90 (15-350 keV) is 12.4 +- 0.2 sec (estimated error including systematics). The time-averaged spectrum from T-5.5 to T+9.0 is best fit by a simple power-law model. The power law index of the time-averaged spectrum is 1.50 +- 0.25. The fluence in the 15-150 keV band is 2.8 +- 0.4 x 10^-7 erg/cm2. The 1-sec peak photon flux measured from T+2.69 sec in the 15-150 keV band is 0.4 +- 0.1 ph/cm2/sec. All the quoted errors are at the 90% confidence level.