NOTE: uvot_fluxes_wget.pl vrs. 2020-11-03a fem at 220320d09h54m05s316889usUT
NOTE: Source region spec. is: 218.22421 61.29497 4"
NOTE: Used archived XRT position of 218.22421  61.29497  4.00
NOTE: position reference is GCN_Circulars-31771

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

GRB 220319A: Swift/UVOT Upper Limits

M. A. Baer (PSU) and K. L. Page (U. Leicester)
report on behalf of the Swift/UVOT team:

The Swift/UVOT began settled observations of the field of GRB 220319A
105 s after the BAT trigger (Page et al., GCN Circ. 31769).
No optical afterglow consistent with the XRT position
(Goad et al. GCN Circ. 31771)
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           105          255          147         >20.8
u_FC               318          567          246         >19.8
white              105         1715          411         >21.5
v                  647         1764          136         >18.7
b                  573         1690          117         >19.7
u                  318         1836          361         >19.7
w1                1276         1814           78         >19.9
w2                1202         1222           19         >19.2

The magnitudes in the table are not corrected for the Galactic extinction
due to the reddening of E(B-V) = 0.010 in the direction of the burst
(Schlegel et al. 1998).