NOTE: uvot_fluxes_wget.pl vrs. 2020-11-03a fem at 220716d03h16m50s371587usUT
NOTE: Source region spec. is: 254.87533 -33.59775 4"
NOTE: Used archived XRT position of 254.87533 -33.59775  4.00
NOTE: position reference is GCN_Circulars-32409

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

GRB 220715B: Swift/UVOT Upper Limits

N. P. M. Kuin (UCL-MSSL) and E. Troja (NASA/GSFC/UMCP)
report on behalf of the Swift/UVOT team:

The Swift/UVOT began settled observations of the field of GRB 220715B
103 s after the BAT trigger (Troja et al., GCN Circ. 32405).
No optical afterglow consistent with the XRT position
(Goad et al. GCN Circ. 32409)
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           103          253          147         >20.1
u_FC               316          565          246         >20.0
white              103         1369          373         >20.4
v                  645         1419           97         >18.9
b                  571         5005          274         >20.8
u                  316         1488          319         >20.1
w1                 695         1468           78         >18.8
m2                 670         1443           97         >19.8
w2                 621         5144          227         >19.9

The magnitudes in the table are not corrected for the Galactic extinction
due to the reddening of E(B-V) = 0.525 in the direction of the burst
(Schlegel et al. 1998).