TITLE: GCN CIRCULAR NUMBER: 12689 SUBJECT: GRB 111215A: Swift-BAT refined analysis DATE: 11/12/15 23:04:57 GMT FROM: Scott Barthelmy at NASA/GSFC 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), C. B. Markwardt (GSFC), S. R. Oates (UCL-MSSL), D. M. Palmer (LANL), T. Sakamoto (GSFC/UMBC), 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-239 to T+963 sec from recent telemetry downlinks, we report further analysis of BAT GRB 111215A (trigger #509717) (Oates, et al., GCN Circ. 12681). The BAT ground-calculated position is RA, Dec = 349.582, 32.440 deg, which is RA(J2000) = 23h 18m 19.6s Dec(J2000) = +32d 26' 24.2" with an uncertainty of 4.2 arcmin, (radius, sys+stat, 90% containment). The partial coding was 46%. The mask-weighted light curve shows the emission starting at ~T-110 sec, although we note that the burst location came into the BAT FoV around T-200 sec, so we can not make any statement about possible earlier emission. There are a few overlapping peaks at ~T+20 sec, ~T+170 sec, and T+300 sec, the the lightcurve slowly decreases back to baseline around T+1500 sec. T90 (15-350 keV) is 796 +- 250 sec (estimated error including systematics). The time-averaged spectrum from T-116.4 to T+960.1 sec is best fit by a simple power-law model. The power law index of the time-averaged spectrum is 1.70 +- 0.18. The fluence in the 15-150 keV band is 4.5 +- 0.5 x 10^-6 erg/cm2. The 1-sec peak photon flux measured from T+216.35 sec in the 15-150 keV band is 0.5 +- 0.2 ph/cm2/sec. All the quoted errors are at the 90% confidence level. The duration of this burst is very long, and we note that this location is well off the Galactic Plane (lon=101,lat=-26). We can not rule out a non-GRB source for this event. The results of the batgrbproduct analysis are available at http://gcn.gsfc.nasa.gov/notices_s/509717/BA/