GCN Circular 22912
Subject
GRB 180705A: Swift/UVOT Upper Limits
Date
2018-07-06T10:11:35Z (6 years ago)
From
Alice Breeveld at MSSL-UCL <a.breeveld@ucl.ac.uk>
A. A. Breeveld (UCL-MSSL), S. W. K Emery (UCL-MSSL) and M. Stamatikos
(OSU/NASA/GSFC) report on behalf of the Swift/UVOT team:
The Swift/UVOT began settled observations of the field of GRB 180705A
3368 s after the BAT trigger (Stamatikos et al., GCN Circ. 22902).
No optical afterglow consistent with the enhanced XRT position (Goad et
al. GCN Circ. 22906) is detected in the initial UVOT exposures.
Preliminary 3-sigma upper limits using the UVOT photometric system
(Breeveld et al. 2011, AIP Conf. Proc. 1358, 373) for the first finding
chart (FC) exposure and subsequent exposures are:
Filter T_start(s) T_stop(s) Exp(s) Mag
white_FC 3368 3485 115 >20.2
white 3368 5327 312 >20.8
v 4103 5738 393 >18.9
b 4923 11649 311 >20.5
u 4718 11527 1082 >21.0
w1 4513 16889 483 >20.5
m2 4308 15205 647 >20.1
w2 5333 5533 197 >20.4
The magnitudes in the table are not corrected for the Galactic
extinction due to the reddening of E(B-V) = 0.06 in the direction of the
burst (Schlegel et al. 1998).