TITLE: GCN CIRCULAR NUMBER: 7338 SUBJECT: GRB 080229, Swift-BAT refined analysis DATE: 08/03/01 00:15:19 GMT FROM: Scott Barthelmy at NASA/GSFC C. Markwardt (GSFC/UMD), S. D. Barthelmy (GSFC), J. K. Cannizzo (NASA/UMBC), J. Cummings (GSFC/UMBC), E. Fenimore (LANL), N. Gehrels (GSFC), H. Krimm (GSFC/USRA), K. McLean (GSFC/UMD), D. Palmer (LANL), A. Parsons (GSFC), T. Sakamoto (GSFC/UMBC), G. Sato (GSFC/ISAS), M. Stamatikos (GSFC/ORAU), J. Tueller (GSFC), T. Ukwatta (GWU) (i.e. the Swift-BAT team): Using the data set from T-239 to T+303 sec from recent telemetry downlinks, we report further analysis of BAT GRB 080229 (trigger #304379) (Cannizzo, et al., GCN Circ. 7335). The BAT ground-calculated position is RA, Dec = 228.220, -14.697 deg, which is RA(J2000) = 15h 12m 52.7s Dec(J2000) = -14d 41' 50" with an uncertainty of 1.5 arcmin, (radius, sys+stat, 90% containment). The partial coding was 18%. The mask-weighted light curve shows an initial small peak starting at ~T-3 sec, peaking at T_zero, and ending at ~T+12 sec. Then there are two smaller peaks centered on T+18 and T+28 sec. Then comes two overlapping large peaks on T+35 and T+39 sec with the latter tailing out to ~T+85 sec. T90 (15-350 keV) is 64 +- 16 sec (estimated error including systematics). The time-averaged spectrum from T-15.1 to T+64.9 sec is best fit by a simple power-law model. The power law index of the time-averaged spectrum is 1.91 +- 0.06. The fluence in the 15-150 keV band is 9.0 +- 0.2 x 10^-6 erg/cm2. The 1-sec peak photon flux measured from T+40.36 sec in the 15-150 keV band is 5.7 +- 0.2 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/304379/BA/