NOTE: uvot_fluxes_wget.pl vrs. 2020-11-03a fem at 210727d00h10m37s938717usUT
NOTE: Source region spec. is: 193.29092 19.19031 4"
NOTE: Used archived XRT position of 193.29092  19.19031  4.00
NOTE: position reference is GCN_Circulars-30524

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

GRB 210726A: Swift/UVOT Upper Limits

M. A. Baer (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 210726A
42 s after the BAT trigger (Bernardini et al., GCN Circ. 30523).
No optical afterglow consistent with the XRT position
(Osborne et al. GCN Circ. 30524)
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            65          215          147         >20.2
u_FC               277          527          246         >19.4
white               65         1027          295         >20.9
v                   42           55           13         >17.2
u                  277          527          246         >19.4

The magnitudes in the table are not corrected for the Galactic extinction
due to the reddening of E(B-V) = 0.020 in the direction of the burst
(Schlegel et al. 1998).