GCN Circular 12951

S. R. Oates (MSSL-UCL) and T. Sakamoto (NASA/UMBC)
report on behalf of the Swift/UVOT team:

The Swift/UVOT began settled observations of the field of GRB 120213A
59 s after the BAT trigger (Sakamoto et al., GCN Circ. 12942
Not found
 
 
).
No optical afterglow consistent with the XRT position
(Beardmore et al., GCN Circ. 12948
Not found
 
 
) 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            59          209          147         >19.8
u_FC               271          521          246         >19.7
white               59        12944         1454         >21.6
v                  602         6546          294         >20.4
b                  527        12032         1219         >20.5
u                  271         7161          717         >20.6
w1                 653         6956          471         >19.8
m2                6551         6751          197         >19.8
w2                 578        13010          332         >20.1

The magnitudes in the table are not corrected for the Galactic extinction
due to the reddening of E(B-V) = 0.22 in the direction of the burst
(Schlegel et al. 1998).