TITLE: GCN CIRCULAR NUMBER: 17176 SUBJECT: GRB 141212B: Swift-BAT refined analysis DATE: 14/12/13 05:05:43 GMT FROM: Tilan Ukwatta at MSU T. Sakamoto (AGU), S. D. Barthelmy (GSFC), W. H. Baumgartner (GSFC/UMBC), J. R. Cummings (GSFC/UMBC), N. Gehrels (GSFC), H. A. Krimm (GSFC/USRA), A. Y. Lien (GSFC/UMBC), C. B. Markwardt (GSFC), D. M. Palmer (LANL), 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+459 sec from the recent telemetry downlink, we report further analysis of BAT GRB 141212B (trigger #621234) (Stamatikos, et al., GCN Circ. 17159). The BAT ground-calculated position is RA, Dec = 250.866, 31.749 deg which is RA(J2000) = 16h 43m 27.9s Dec(J2000) = +31d 44' 55.3" with an uncertainty of 1.0 arcmin, (radius, sys+stat, 90% containment). The partial coding was 77%. BAT light curve shows a single multi-peaked episode starting around T+0 sec, and ending around T+15 sec. The two main peaks of the light curve can be seen at T+5 sec and T+6 sec. T90 (15-350 keV) is 10.5 +- 0.7 sec (estimated error including systematics). The time-averaged spectrum from T-0.06 to T+12.14 sec is best fit by a simple power-law model. The power law index of the time-averaged spectrum is 1.46 +- 0.09. The fluence in the 15-150 keV band is 1.2 +- 0.1 x 10^-06 erg/cm2. The 1-sec peak photon flux measured from T+4.10 sec in the 15-150 keV band is 3.9 +- 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/621234/BA/