NOTE: uvot_fluxes_wget.pl vrs. 2020-11-03a fem at 220930d18h26m28s273297usUT
NOTE: Source region spec. is: 64.71717 13.34903 4"
NOTE: Used archived XRT position of  64.71717  13.34903  4.00
NOTE: position reference is GCN_Circulars-32608

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

GRB 220930A: Swift/UVOT Upper Limits

A. Belles (PSU) and S. B. Cenko (GSFC)
report on behalf of the Swift/UVOT team:

The Swift/UVOT began settled observations of the field of GRB 220930A
180 s after the BAT trigger (Cenko et al., GCN Circ. 32603).
No optical afterglow consistent with the XRT position
(Evans et al. GCN Circ. 32608)
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           180          329          147         >20.8
u_FC               338          587          246         >20.2
white              180         5549          400         >21.6
v                  668         1417           97         >18.7
b                  594         5515          274         >20.1
u                  338         5310          442         >20.7

The magnitudes in the table are not corrected for the Galactic extinction
due to the reddening of E(B-V) = 0.639 in the direction of the burst
(Schlegel et al. 1998).