GRB 131110A

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.

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.

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
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 ). 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.