NOTE: uvot_fluxes_wget.pl vrs. 2020-11-03a fem at 210726d04h35m14s795933usUT
NOTE: Source region spec. is: 215.37412 -1.19267 4"
NOTE: Used archived XRT position of 215.37412  -1.19267  4.00
NOTE: position reference is GCN_Circulars-30517

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

GRB 210725A: Swift/UVOT Upper Limits

M. H. Siegel (PSU) and M. G. Bernardini (INAF-OAB)
report on behalf of the Swift/UVOT team:

The Swift/UVOT began settled observations of the field of GRB 210725A
114 s after the BAT trigger (Bernardini et al., GCN Circ. 30501).
No optical afterglow consistent with the XRT position
(Perri et al. GCN Circ. 30517)
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           114          264          147         >20.7
u_FC               273          523          246         >20.2
white              114         1545          392         >21.0
v                  603         1595          117         >19.1
b                  529         1519           97         >20.4
u                  273         1495          343         >20.4
w1                 653         1470           97         >19.2

The magnitudes in the table are not corrected for the Galactic extinction
due to the reddening of E(B-V) = 0.047 in the direction of the burst
(Schlegel et al. 1998).