TITLE: GCN CIRCULAR NUMBER: 15750 SUBJECT: GRB 140118A, Swift-BAT refined analysis DATE: 14/01/18 15:15:04 GMT FROM: Hans Krimm at NASA-GSFC A. Y. Lien (NASA/UMBC), S. D. Barthelmy (GSFC), W. H. Baumgartner (GSFC/UMBC), J. R. Cummings (GSFC/UMBC), N. Gehrels (GSFC), H. A. Krimm (GSFC/USRA), C. B. Markwardt (GSFC), D. M. Palmer (LANL), T. Sakamoto (AGU), M. Stamatikos (OSU), J. Tueller (GSFC), T. N. Ukwatta (MSU) (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 140118A (trigger #584136) (Krimm, et al., GCN Circ. 15748). The BAT ground-calculated position is RA, Dec = 330.999, -17.937 deg which is RA(J2000) = 22h 03m 59.8s Dec(J2000) = -17d 56' 14.1" with an uncertainty of 1.5 arcmin, (radius, sys+stat, 90% containment). The partial coding was 41%. The mask-weighted light curve shows a double-peaked structure of two triangular shaped peaks. The first runs from T-70 to T-20 and the second, stronger peak from T-20 to T+30. T90 (15-350 keV) is 84.15 +- 10.79 sec (estimated error including systematics). The time-averaged spectrum from T-73.61 to T+30.87 sec is best fit by a simple power-law model. The power law index of the time-averaged spectrum is 1.87 +- 0.13. The fluence in the 15-150 keV band is 2.6 +- 0.2 x 10^-6 erg/cm2. The 1-sec peak photon flux measured from T+2.98 sec in the 15-150 keV band is 1.9 +- 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/584136/BA/