TITLE: GCN CIRCULAR NUMBER: 9890 SUBJECT: GRB 090904B: Swift-BAT refined analysis DATE: 09/09/04 13:27:29 GMT FROM: Scott Barthelmy at NASA/GSFC T. Sakamoto (GSFC/UMBC), S. D. Barthelmy (GSFC), W. H. Baumgartner (GSFC/UMBC), J. R. Cummings (GSFC/UMBC), V. D'Elia (ASDC), E. E. Fenimore (LANL), N. Gehrels (GSFC), H. A. Krimm (GSFC/USRA), C. B. Markwardt (GSFC/UMD), D. M. Palmer (LANL), M. Stamatikos (GSFC/ORAU), J. Tueller (GSFC), T. N. Ukwatta (GWU) (i.e. the Swift-BAT team): Using the data set from T-119 to T+303 sec from the recent telemetry downlink, we report further analysis of BAT GRB 090904B (trigger #361831) (D'Elia, et al., GCN Circ. 9881). The BAT ground-calculated position is RA, Dec = 264.194, -25.219 deg, which is RA(J2000) = 17h 36m 46.5s Dec(J2000) = -25d 13' 09.0" with an uncertainty of 1.2 arcmin, (radius, sys+stat, 90% containment). The partial coding was 8%. The mask-weighted light curve shows the burst starting at ~T-30 sec, with several overlapping peaks between T-5 to T+20 sec and another series from T+30 to T+50 sec. The burst is over by ~T+70 sec T90 (15-350 keV) is 47.0 +- 1.7 sec (estimated error including systematics). The time-averaged spectrum from T-2.5 to T+49.7 sec is best fit by a simple power-law model. The power law index of the time-averaged spectrum is 1.59 +- 0.07. The fluence in the 15-150 keV band is 1.1 +- 0.0 x 10^-5 erg/cm2. The 1-sec peak photon flux measured from T+12.42 sec in the 15-150 keV band is 5.3 +- 0.9 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/361831/BA/