TITLE: GCN CIRCULAR NUMBER: 12873 SUBJECT: GRB 120118B, Swift-BAT refined analysis DATE: 12/01/19 14:48:38 GMT FROM: Hans Krimm at NASA-GSFC T. Sakamoto (GSFC/UMBC), S. D. Barthelmy (GSFC), W. H. Baumgartner (GSFC/UMBC), J. R. Cummings (GSFC/UMBC), E. E. Fenimore (LANL), N. Gehrels (GSFC), H. A. Krimm (GSFC/USRA), O. M. Littlejohns (U Leicester), C. B. Markwardt (GSFC), D. M. Palmer (LANL), 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+242 sec from the recent telemetry downlink, we report further analysis of BAT GRB 120118B (trigger #512003) (Littlejohns, et al., GCN Circ. 12852). The BAT ground-calculated position is RA, Dec = 124.862, -7.178 deg which is RA(J2000) = 08h 19m 26.9s Dec(J2000) = -07d 10' 39.5" with an uncertainty of 1.3 arcmin, (radius, sys+stat, 90% containment). The partial coding was 40%. The mask-weighted light curve shows a single smooth FRED peak lasting from T-5 sec to T+25 sec. T90 (15-350 keV) is 23.26 +- 4.02 sec (estimated error including systematics). The time-averaged spectrum from T-1.92 to T+30.51 sec is best fit by a simple power-law model. The power law index of the time-averaged spectrum is 2.08 +- 0.11. The fluence in the 15-150 keV band is 1.8 +- 0.1 x 10^-6 erg/cm2. The 1-sec peak photon flux measured from T+6.69 sec in the 15-150 keV band is 2.2 +- 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/512003/BA/