GCN Circular 15496
Subject
GRB 131117A: Swift/UVOT Detection
Date
2013-11-17T14:57:25Z (11 years ago)
From
Alice Breeveld at MSSL-UCL <a.breeveld@ucl.ac.uk>
A. A. Breeveld (UCL-MSSL) and M. J. Page (UCL-MSSL) report on behalf of
the Swift/UVOT team:
The Swift/UVOT began settled observations of the field of GRB 131117A
70s after the BAT trigger (Page et al., GCN Circ. 15490).
A fading source consistent with the afterglow position found by Trotter
et al. (GCN Circ. 15491) is found in the white filter only. This is
consistent with the redshift of z=4.042 given by Hartoog et al. (GCN
Circ. 15494).
The preliminary UVOT position is:
RA (J2000) = 22:09:19.36 = 332.33067 (deg.)
Dec (J2000) = -31:45:44.3 = -31.76231 (deg.)
with an estimated uncertainty of 0.64 arc sec. (radius, 90% confidence).
Preliminary detections and 3-sigma upper limits using the UVOT
photometric system (Breeveld et al. 2011, AIP Conf. Proc. 1358, 373) for
the early exposures are:
Filter T_start(s) T_stop(s) Exp(s) Mag
white 70 219 147 20.13 � 0.17
v 611 5157 216 >20.0
b 537 4542 216 >20.6
u 282 4336 442 >20.7
w1 660 5567 216 >20.4
m2 636 5362 216 >20.0
w2 587 4952 216 >20.5
The magnitudes in the table are not corrected for the Galactic
extinction due to the reddening of E(B-V) = 0.02 in the direction of the
burst (Schlegel et al. 1998).