GCN Circular 13448
Subject
GRB 120711A: Swift/UVOT Observations
Event
Date
2012-07-11T21:55:34Z (13 years ago)
From
Alice Breeveld at MSSL-UCL <aab@mssl.ucl.ac.uk>
A. A. Breeveld (MSSL-UCL) and M. J. Page (MSSL-UCL) report on behalf of
the Swift/UVOT team:
The Swift/UVOT began settled observations of the field of GRB 120711A
8216 s after the INTEGRAL trigger (Gotz et al., GCN Circ. 13434).
No significant optical afterglow consistent with the position given in
Lacluyze et al. (GCN_Circ. 13430) is detected in the initial UVOT
exposures. However, in the U filter, the source may be detected at this
position with a significance of 2 sigma. The possible detection is
included in the table.
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
b 8464 8480 16 >18.7
u 8380 8459 79 >19.4
w1 8216 8375 157 >19.8
u 8380 8459 79 19.6 � 0.5 (2sig)
The magnitudes in the table are not corrected for the Galactic
extinction due to the reddening of E(B-V) = 0.08 in the direction of the
burst (Schlegel et al. 1998).