TITLE: GCN CIRCULAR NUMBER: 16892 SUBJECT: GRB 141004A: Swift-BAT refined analysis DATE: 14/10/05 17:11:58 GMT FROM: Scott Barthelmy at NASA/GSFC J. R. Cummings (GSFC/UMBC), S. D. Barthelmy (GSFC), W. H. Baumgartner (GSFC/UMBC), V. D'Elia (ASDC), N. Gehrels (GSFC), H. A. Krimm (GSFC/USRA), A. Y. Lien (GSFC/UMBC), C. B. Markwardt (GSFC), D. M. Palmer (LANL), T. Sakamoto (AGU), M. Stamatikos (OSU), J. Tueller (GSFC), T. N. Ukwatta (LANL) (i.e. the Swift-BAT team): Using the data set from T-239 to T+963 sec from the recent telemetry downlink, we report further analysis of BAT GRB 141004A (trigger #614390) (D'Elia, et al., GCN Circ. 16878). The BAT ground-calculated position is RA, Dec = 76.721, 12.828 deg, which is RA(J2000) = 05h 06m 53.0s Dec(J2000) = +12d 49' 41.2" with an uncertainty of 1.0 arcmin, (radius, sys+stat, 90% containment). The partial coding was 100%. The mask-weighted light curve shows a single FRED peak starting with a weak emission at T-1 sec, the FRED peak starting at T_0.0, peaking at T+0.1 sec, and returning to baseline at ~T+20 sec. T90 (15-350 keV) is 3.92 +- 1.07 sec (estimated error including systematics). The time-averaged spectrum from T-0.84 to T+5.34 sec is best fit by a simple power-law model. The power law index of the time-averaged spectrum is 1.86 +- 0.08. The fluence in the 15-150 keV band is 6.7 +- 0.3 x 10^-7 erg/cm2. The 1-sec peak photon flux measured from T-0.06 sec in the 15-150 keV band is 6.1 +- 0.3 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/614390/BA/