TITLE: GCN CIRCULAR NUMBER: 7817 SUBJECT: GRB 080604, Swift-BAT refined analysis DATE: 08/06/04 18:03:17 GMT FROM: Scott Barthelmy at NASA/GSFC S. D. Barthelmy (GSFC), W. Baumgartner (GSFC/UMBC), J. Cummings (GSFC/UMBC), E. Fenimore (LANL), N. Gehrels (GSFC), H. Krimm (GSFC/USRA), V. La Parola (INAF-IASFPA), C. Markwardt (GSFC/UMD), K. McLean (GSFC/UMD), D. Palmer (LANL), T. Sakamoto (GSFC/UMBC), G. Sato (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+963 sec from recent telemetry downlinks, we report further analysis of BAT GRB 080604 (trigger #313116) (La Parola, et al., GCN Circ. 7800). The BAT ground-calculated position is RA, Dec = 236.960, 20.557 deg, which is RA(J2000) = 15h 47m 50.3s Dec(J2000) = +20d 33' 25.4" with an uncertainty of 2.0 arcmin, (radius, sys+stat, 90% containment). The partial coding was 100%. The mask-weighted light curve shows a single peak starting at ~T-25 sec and ending at ~T+100 sec. T90 (15-350 keV) is 82 +- 13 sec (estimated error including systematics). The time-averaged spectrum from T-27.3 to T+67.2 sec is best fit by a simple power-law model. The power law index of the time-averaged spectrum is 1.78 +- 0.18. The fluence in the 15-150 keV band is 8.0 +- 0.9 x 10^-7 erg/cm2. The 1-sec peak photon flux measured from T-3.02 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. The results of the batgrbproduct analysis are available at http://gcn.gsfc.nasa.gov/notices_s/313116/BA/ This burst satisfies Sakamoto/Ukwatta Swift-BAT possible high-z criteria (Ukwatta et al. arXiv:0802.3815): 1) Pawer Law photon index = 1.78 (PL photon index < 2) 2) 1-s peak photon flux = 0.4 (1-s peak photon flux < 1.0 ph/cm2/s) 3) Light curve variance = 1.1e-05 (Variance < 0.0001) 4) T90/(Peak photon flux) = 218 (T90/(Peak photon flux) > 100) Based on a limited sample of bursts, these criteria yield an 85% chance it has a redshift greater than 3.5. We note that the Cucchiara (GCN Circ 7805) HET spectrum yields a z = 1.28.