TITLE: GCN CIRCULAR NUMBER: 13970 SUBJECT: GRB 121117A, Swift-BAT refined analysis DATE: 12/11/17 21:31:41 GMT FROM: Jay R. Cummings at NASA/GSFC/Swift J. R. Cummings (GSFC/UMBC), S. D. Barthelmy (GSFC), W. H. Baumgartner (GSFC/UMBC), E. E. Fenimore (LANL), N. Gehrels (GSFC), H. A. Krimm (GSFC/USRA), C. B. Markwardt (GSFC), D. M. Palmer (LANL), T. Sakamoto (AGU), G. Sato (ISAS), M. Stamatikos (OSU), J. Tueller (GSFC), T. N. Ukwatta (MSU) (i.e. the Swift-BAT team): Using the data set from T-61 to T+191 sec from the recent telemetry downlink, we report further analysis of BAT GRB 121117A (trigger #538696) (Cummings, et al., GCN Circ. 13967). The BAT ground-calculated position is RA, Dec = 31.617, 7.432 deg which is RA(J2000) = 02h 06m 28.1s Dec(J2000) = +07d 25' 55.6" with an uncertainty of 1.1 arcmin, (radius, sys+stat, 90% containment). The partial coding was 100%. The mask-weighted light curve shows a single FRED peak. Swift was close to the SAA and BAT entered SAA mode about 250 seconds after the trigger. T90 (15-350 keV) is 30 +- 5 sec (estimated error including systematics). The time-averaged spectrum from T+0.0 to T+158.6 sec is best fit by a simple power-law model. The power law index of the time-averaged spectrum is 1.16 +- 0.18. The fluence in the 15-150 keV band is 1.4 +- 0.2 x 10^-06 erg/cm2. The 1-sec peak photon flux measured from T+7.06 sec in the 15-150 keV band is 1.1 +- 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/538696/BA/