GCN Circular 22439

S. A. Sebzda (PSU) and J. K. Cannizzo (NASA/UMBC)
report on behalf of the Swift/UVOT team:

The Swift/UVOT began settled observations of the field of GRB 180222A
83 s after the BAT trigger (Cannizzo et al., GCN Circ. 22433
Not found
 
 
).
No optical afterglow consistent with the XRT position
(Cannizzo et al. GCN Circ. 22433
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            83          233          147         >20.6
u_FC               295          545          246         >19.5
white               83         1196          353         >21.6
v                  624         1073           58         >18.0
b                  551         1171           58         >18.6
u                  295         1146          285         >19.7
w1                 673         1122           58         >18.0
m2                 649         1097           58         >18.0
w2                 600         1221           78         >19.3

The magnitudes in the table are not corrected for the Galactic extinction
due to the reddening of E(B-V) = 1.68 in the direction of the burst
(Schlegel et al. 1998).