TITLE: GCN CIRCULAR NUMBER: 6468 SUBJECT: GRB 070529, Swift-BAT refined analysis DATE: 07/05/29 18:10:23 GMT FROM: Scott Barthelmy at NASA/GSFC A. Parsons (GSFC), L. Barbier (GSFC), S. D. Barthelmy (GSFC), J. Cummings (GSFC/UMBC), E. Fenimore (LANL), N. Gehrels (GSFC), S. T. Holland (CRESST/GSFC/USRA), H. Krimm (GSFC/USRA), C. Markwardt (GSFC/UMD), D. Palmer (LANL), T. Sakamoto (GSFC/ORAU), G. Sato (GSFC/ISAS), M. Stamatikos (GSFC/ORAU), J. Tueller (GSFC), T. Ukwatta (GWU) on behalf of the Swift-BAT team: Using the data set from T-119 to T+283 sec from the recent telemetry downlink, we report further analysis of BAT GRB 070529 (trigger #280706) (Holland, et al., GCN Circ. 6466). The BAT ground-calculated position is RA, Dec = 283.725, 20.648 deg which is RA(J2000) = 18h 54m 54.0s Dec(J2000) = 20d 38' 54" with an uncertainty of 1.9 arcmin, (radius, sys+stat, 90% containment). The partial coding was 16%. The mask-weighted lightcurve shows multiple overlapping peaks starting at T_0 and lasting out T+120 sec. There is a possible (~4 sigma) 10-sec peak at ~T-55 sec. T90 (15-350 keV) is 109 +- 3 sec (estimated error including systematics). The time-averaged spectrum from T-1.2 to T+120.9 sec is best fit by a simple power-law model. The power law index of the time-averaged spectrum is 1.38 +- 0.16. The fluence in the 15-150 keV band is 2.6 +- 0.2 x 10^-6 erg/cm2. The 1-sec peak photon flux measured from T+2.02 sec in the 15-150 keV band is 1.4 +- 0.4 ph/cm2/sec. All the quoted errors are at the 90% confidence level.