TITLE:   GCN CIRCULAR
NUMBER:  18597
SUBJECT: GRB 151112A: Swift/UVOT Upper Limits
DATE:    15/11/13 11:13:43 GMT
FROM:    Samantha Oates at MSSL  <sro@mssl.ucl.ac.uk>

S. R. Oates (IAA-CSIC/UCL-MSSL) and D. Malesani (DARK/NBI)
report on behalf of the Swift/UVOT team:

The Swift/UVOT began settled observations of the field of GRB 151112A
3144 s after the BAT trigger (Malesani et al., GCN Circ. 18588).
No optical afterglow, consistent with the enhanced XRT position
(Osborne et al. GCN Circ. 18592) and the GROND position 
(Knust et al., GCN Circ. 18595), 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          3144         3294          147         >21.3
white             3144         4527          344         >21.8
v                 3301         4938          393         >20.2
b                 4123        10985          349         >21.1
u                 3917        10825         1082         >21.5
w1                3711         9912         1169         >21.4
m2                3506        15760         1240         >21.3

The magnitudes in the table are not corrected for the Galactic extinction
due to the reddening of E(B-V) = 0.01 in the direction of the burst
(Schlegel et al. 1998).