TITLE: GCN CIRCULAR NUMBER: 15487 SUBJECT: GRB 131110A BAT refined analysis DATE: 13/11/15 02:24:09 GMT FROM: Jay R. Cummings at NASA/GSFC/Swift J. R. Cummings (GSFC/UMBC), S. D. Barthelmy (GSFC), W. H. Baumgartner (GSFC/UMBC), N. Gehrels (GSFC), H. A. Krimm (GSFC/USRA), A. Y. Lien (NASA/UMBC), C. B. Markwardt (GSFC), D. M. Palmer (LANL), T. Sakamoto (AGU), M. Stamatikos (OSU), J. Tueller (GSFC), T. N. Ukwatta (MSU) We report further analysis of the ground-detected Swift-BAT slew GRB 131110A (Cummings and Palmer, GCN circ # 15483). The best BAT position is RA, Dec 69.268, -17.259 which is RA (J2000) 04h 37m 4.4s Dec (J2000) -17d 15' 34" with an estimated 90% containment radius of 0.8 arcmin. The BAT mask-weighted lightcurve shows a single broad peak with a slow rise to a plateau at T+25 seconds, lasting about 70 seconds, and a slow decay. T90 is about 100 +- 10 seconds. The average spectrum from T0 to T+90 (after which the source had a low mask coding factor in BAT) is best fit by a simple power law function with a photon index of 1.61 +- 0.09. The fluence from 15-150 keV during this interval was (3.53 +- 0.10) x 10^-6 ergs/cm^2/sec. Errors are 90% confidence. A Swift TOO has been approved with the observation number 20327, to be performed 11/15/2013.