TITLE:   GCN CIRCULAR
NUMBER:  17179
SUBJECT: GRB 141212B: Swift/UVOT Upper Limits
DATE:    14/12/13 10:55:04 GMT
FROM:    Samantha Oates at MSSL  <sro@mssl.ucl.ac.uk>

S. R. Oates (IAA-CSIC/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 141212B
403 s after the BAT trigger (Stamatikos et al., GCN Circ. 17159).
No optical afterglow consistent with the XRT position
(Page et al. GCN Circ. 17174)
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           403          530          125         >19.8
v                 3819         3975          153         >18.9

The magnitudes in the table are not corrected for the Galactic extinction
due to the reddening of E(B-V) = 0.03 in the direction of the burst
(Schlegel et al. 1998).