TITLE: GCN CIRCULAR NUMBER: 7839 SUBJECT: GRB 080605, Swift-BAT refined analysis DATE: 08/06/06 17:37:12 GMT FROM: Scott Barthelmy at NASA/GSFC J. Cummings (GSFC/UMBC), S. D. Barthelmy (GSFC), W. Baumgartner (GSFC/UMBC), E. Fenimore (LANL), N. Gehrels (GSFC), H. Krimm (GSFC/USRA), C. Markwardt (GSFC/UMD), K. McLean (GSFC/UMD), D. Palmer (LANL), A. Parsons (GSFC), T. Sakamoto (GSFC/UMBC), G. Sato (ISAS), M. Stamatikos (GSFC/ORAU), B. Sbarufatti (INAF-IASFPA), J. Tueller (GSFC), T. Ukwatta (GWU) (i.e. the Swift-BAT team): Using the data set from T-240 to T+962 sec from recent telemetry downlinks, we report further analysis of BAT GRB 080605 (trigger #313299) (Sbarufatti, et al., GCN Circ. 7828). The BAT ground-calculated position is RA, Dec = 262.130, 4.010 deg, which is RA(J2000) = 17h 28m 31.1s Dec(J2000) = +04d 00' 35.6" with an uncertainty of 1.0 arcmin, (radius, sys+stat, 90% containment). The partial coding was 41%. The mask-weighted light curve shows a cluster of overlapping peaks starting at ~T-3 sec, the largest peak at ~T+8 sec, and all ending at ~T+70 sec. At the 1-2 sigma level, there is appears to be persistant emmission in the T+300 to T+700 sec range. T90 (15-350 keV) is 20 +- 1 sec (estimated error including systematics). The time-averaged spectrum from T-5.5 to T+30.0 sec is best fit by a power law with an exponential cutoff. This fit gives a photon index 1.11 +- 0.14, and Epeak of 223 +- 133 keV (chi squared 28.10 for 56 d.o.f.). For this model the total fluence in the 15-150 keV band is 1.33 +- 0.02 x 10^-5 erg/cm2 and the 1-sec peak flux measured from T+7.57 sec in the 15-150 keV band is 19.9 +- 0.6 ph/cm2/sec. A fit to a simple power law gives a photon index of 1.36 +- 0.03 (chi squared 37 for 57 d.o.f.). 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/313299/BA/