TITLE: GCN CIRCULAR NUMBER: 7786 SUBJECT: GRB 080602, Swift-BAT refined analysis DATE: 08/06/02 22:31:48 GMT FROM: Scott Barthelmy at NASA/GSFC G. Sato (GSFC/ISAS), S. D. Barthelmy (GSFC), W. Baumgartner (GSFC/UMBC), A. P. Beardmore (U Leicester), J. Cummings (GSFC/UMBC), E. Fenimore (LANL), N. Gehrels (GSFC), H. Krimm (GSFC/USRA), C. Markwardt (GSFC/UMD), K. McLean (GSFC/UMD), D. Palmer (LANL), T. Sakamoto (GSFC/UMBC), M. Stamatikos (GSFC/ORAU), J. Tueller (GSFC), T. Ukwatta (GWU) (i.e. the Swift-BAT team): Using the data set from T-296 to T+302 sec from recent telemetry downlinks, we report further analysis of BAT GRB 080602 (trigger #312958) (Beardmore, et al., GCN Circ. 7781). The BAT ground-calculated position is RA, Dec = 19.177, -9.239 deg, which is RA(J2000) = 01h 16m 42.6s Dec(J2000) = -09d 14' 19.8" with an uncertainty of 1.7 arcmin, (radius, sys+stat, 90% containment). The partial coding was 19%. The mask-weighted light curve shows 4 or 5 peaks, the first starting at ~T-25 sec, the second at ~T-15 sec, the 3rd at ~T-5 sec, peaking at ~T+1 sec and ending at ~T+15 sec; the 4th starts at ~T+55 sec and ends at ~T+65 sec. T90 (15-350 keV) is 74 +- 7 sec (estimated error including systematics). The time-averaged spectrum from T-11.5 to T+69.3 sec is best fit by a simple power-law model. The power law index of the time-averaged spectrum is 1.43 +- 0.13. The fluence in the 15-150 keV band is 3.2 +- 0.2 x 10^-6 erg/cm2. The 1-sec peak photon flux measured from T+59.60 sec in the 15-150 keV band is 2.9 +- 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/312958/BA/