NOTE: uvot_fluxes_wget.pl vrs. 2018-11-07 fem at 191026d01h18m05s148696usUT
NOTE: Source region spec. is: 139.771 +1.384 3"
NOTE: Used archived BAT position of 139.77100   1.38400
NOTE: position reference is GCN_Position_Notice

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

GRB 191025: Swift/UVOT Upper Limits

A. A. Breeveld (UCL-MSSL) and ***BA*** (***BA INSTITUTION***)
report on behalf of the Swift/UVOT team:

The Swift/UVOT began settled observations of the field of GRB 191025
73 s after the BAT trigger (***Author*** et al., GCN Circ. ????).
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            73          223          147         >20.2
u_FC               285          535          246         >19.4
white               73          993          315         >20.3
v                  615          807           39         >17.5
b                  541          733           39         >18.5
u                  285          708          265         >19.4
w1                 664          857           39         >17.9
w2                 590          783           39         >18.4

The magnitudes in the table are not corrected for the Galactic extinction
due to the reddening of E(B-V) = 0.03 in the direction of the burst
(Schlegel et al. 1998).