GCN Circular 12848

N. P. M. Kuin (MSSL-UCL) and A. Melandri (INAF-OAB)
report on behalf of the Swift/UVOT team:

The Swift/UVOT began settled observations of the field of GRB 120116A
83 s after the BAT trigger (Melandri et al., GCN Circ. 12834
Not found
 
 
).
No optical afterglow consistent with the enhanced XRT position
Goad et al, GCN_Circ. 12846) 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            83          233          147         >21.0
u_FC               296          546          246         >20.1
white               83          919          192         >21.1
v                 4479         4679          197         >19.1
u                  296         5173          324         >20.4
w1                4889         5089          197         >20.2
m2                4684         4884          197         >19.8
w2                4274         4474          197         >20.5

The magnitudes in the table are not corrected for the Galactic extinction
due to the reddening of E(B-V) = 0.05 in the direction of the burst
(Schlegel et al. 1998).