NOTE: uvot_fluxes_wget.pl vrs. 2020-11-03a fem at 220731d02h33m44s833982usUT
NOTE: Source region spec. is: 225.021 -69.497 3"
NOTE: Used archived BAT position of 225.02100 -69.49700
NOTE: position reference is GCN_Position_Notice

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

GRB 220730A: Swift/UVOT Upper Limits

N. P. M. Kuin (UCL-MSSL) and S. Dichiara (PSU)
report on behalf of the Swift/UVOT team:

The Swift/UVOT began settled observations of the field of GRB 220730A
112 s after the BAT trigger (Dichiara et al., GCN Circ. 32431).
No optical afterglow consistent with the BAT position
*** POSITION REFERENCE is GCN_Position_Notice ***
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           112          261          147         >20.5
u_FC               324          574          246         >19.8
white              112          623          167         >20.6
v                  655          675           19         >17.8
b                  579          599           19         >18.7
u                  324          574          246         >19.8
w2                 630          650           19         >18.4

The magnitudes in the table are not corrected for the Galactic extinction
due to the reddening of E(B-V) = 0.161 in the direction of the burst
(Schlegel et al. 1998).