NOTE: uvot_fluxes_wget.pl vrs. 2020-11-03a fem at 211025d09h37m06s516791usUT
NOTE: Source region spec. is: 162.38425 31.51342 4"
NOTE: Used archived XRT position of 162.38425  31.51342  4.00
NOTE: position reference is GCN_Circulars-30986

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

GRB 211025A: Swift/UVOT Upper Limits

A. A. Breeveld (UCL-MSSL) and J. D. Gropp (PSU)
report on behalf of the Swift/UVOT team:

The Swift/UVOT began settled observations of the field of GRB 211025A
131 s after the BAT trigger (Gropp et al., GCN Circ. 30986).
No optical afterglow consistent with the XRT position
(Gropp et al. GCN Circ. 30986)
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           131          281          147         >20.4
white              131          943          220         >20.9
w1                 669          862           39         >19.1

The magnitudes in the table are not corrected for the Galactic extinction
due to the reddening of E(B-V) = 0.027 in the direction of the burst
(Schlegel et al. 1998).