TITLE:   GCN CIRCULAR
NUMBER:  12926
SUBJECT: GRB 120211A: Swift/UVOT Upper Limits
DATE:    12/02/11 19:42:47 GMT
FROM:    Paul Kuin at MSSL  <npkuin@gmail.com>

N. P. M. Kuin (MSSL-UCL) and E. Sonbas (NASA/GSFC/
Adiyaman_Univ.) report on behalf of the Swift/UVOT team:

The Swift/UVOT began settled observations of the field of GRB 120211A
123 s after the BAT trigger (Sonbas et al., GCN Circ. 12920).
No optical afterglow consistent with the XRT enhanced position
(Goad et al., GCN Circ. 12922) 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           123          273          147         >21.1
u_FC               281          531          246         >20.9
white              123         1528          392         >21.6
v                  612         1577          117         >19.7
b                  537         1503           97         >20.3
u                  281         1478          324         >20.9
w1                 662         1626          117         >20.2
m2                 637         1602          117         >20.1
w2                 588         1553          117         >20.0

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).