//////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 15483 SUBJECT: GRB 131110A found in ground analysis of BAT slew event data DATE: 13/11/14 04:11:17 GMT FROM: Jay R. Cummings at NASA/GSFC/Swift J. R. Cummings and D. M Palmer report on behalf of the Swift-BAT science team: At 11:53:11 Swift was slewing. A rate increase during the slew was noticed in ground post-processing. The BAT lightcurve shows a slow rise and decay peak with about 90 seconds duration. A mosaic of BAT images from the slew shows a significant source at RA, Dec 69.264, -17.258 which is RA (J2000) 04h 37m 3.4s Dec (J2000) -17d 15' 30" with an estimated error radius of 4 arcmin. A Swift TOO has been requested. //////////////////////////////////////////////////////////////////////// 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. //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 15488 SUBJECT: GRB 131110A: Swift-XRT and UVOT upper limits DATE: 13/11/15 15:29:45 GMT FROM: Kim Page at U.of Leicester K.L. Page, P.A. Evans (U. Leicester) and N.P.M. Kuin (UCL-MSSL) report on behalf of the Swift-XRT and UVOT teams: The Swift-XRT began observing the field of GRB 131011A 397 ks after the event (Cummings & Palmer, GCN Circ. 15483). In 2.8 ks of Photon Counting (PC) mode data, no source was found in the BAT error circle; the 3-sigma upper limit (0.3-10 keV) is 3.6e-3 count s^-1 The Swift-UVOT also began observations of the field of GRB 131110A at the same time. No optical afterglow was found in the image. Preliminary 3-sigma upper limits using the UVOT photometric system (Breeveld et al. 2011, AIP Conf. Proc. 1358, 373) for the  initial exposures are: Filter         T_start(s)   T_stop(s)      Exp(s)         Mag white           397556       409058         892          >20.2 v               398095       409489         938          >18.6 u               397018       408678         892          >19.2 This circular is an official product of the Swift team.