GCN Circular 12606
Subject
GRB 111129A: Swift/UVOT Detection
Event
Date
2011-11-30T10:47:24Z (14 years ago)
From
Alice Breeveld at MSSL-UCL <aab@mssl.ucl.ac.uk>
A. A. Breeveld (MSSL-UCL) and J. L. Racusin (NASA/GSFC) report on behalf
of the Swift/UVOT team:
The Swift/UVOT began settled observations of the field of GRB 111129A
96 s after the BAT trigger (Racusin et al., GCN Circ. 12600).
A source consistent with the XRT position (Osborne et al., GCN Circ.
12601) is detected in the initial UVOT exposures in the white and u
filters. The source had already faded by the time the other filters were
used.
The preliminary UVOT position is:
RA (J2000) = 20:29:44.15 = 307.43396 (deg.)
Dec (J2000) = -52:42:46.5 = -52.71293 (deg.)
with an estimated uncertainty of 0.54 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 96 245 147 19.11 � 0.1
white 534 726 39 >20.32
v 584 12305 524 >19.9
b 509 16631 1223 >21.3
u 254 503 246 19.10 � 0.16
w1 633 22753 1296 >21.2
m2 608 6008 413 >20.4
w2 559 12186 1120 >21.5
The magnitudes in the table are not corrected for the Galactic
extinction due to the reddening of E(B-V) = 0.04 in the direction of the
burst (Schlegel et al. 1998).