NOTE: uvot_fluxes_wget.pl vrs. 2020-11-03a fem at 211211d19h23m02s411596usUT
NOTE: Source region spec. is: 212.29121 27.88989 4"
NOTE: Used archived XRT position of 212.29121  27.88989  4.00
NOTE: position reference is GCN_Circulars-31202

=========== Draft Upper Limit Circular ========

GRB 211211A: Swift/UVOT Upper Limits

A. Belles (PSU) and A. D'Ai (INAF-IASFPA)
report on behalf of the Swift/UVOT team:

The Swift/UVOT began settled observations of the field of GRB 211211A
88 s after the BAT trigger (D'Ai et al., GCN Circ. 31202).
No optical afterglow consistent with the XRT position
(D'Ai et al. GCN Circ. 31202)
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            88          238          147         >20.3
white               88         4102          344         >20.8
v                 4313         4512          197         >19.3
b                 3697         3897          197         >20.6
u                 3492         5007          275         >20.2
w1                4723         4923          197         >19.3
m2                4517         4717          197         >20.1
w2                4108         4308          197         >19.2

The magnitudes in the table are not corrected for the Galactic extinction
due to the reddening of E(B-V) = 0.018 in the direction of the burst
(Schlegel et al. 1998).