NOTE: uvot_fluxes_wget.pl vrs. 2024-08-27 fem at 260925d18h13m52s652457usUT
NOTE: Source region spec. is: 132.45679 24.91131 4"
NOTE: Used archived XRT position of 132.45679  24.91131  4.00
NOTE: position reference is GCN_Circulars-45746
WARNING: t_start for light curve (115) and t_start from the exposure report (154) do not agree.
  Replace ??? in draft Circular with correct value.

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

GRB 260925A: Swift/UVOT Upper Limits

***UBS*** (***INSTITUTION***) and Ambrosi (INAF-IASFPA)
report on behalf of the Swift/UVOT team:

The Swift/UVOT began settled observations of the field of GRB 260925A
***???*** s after the BAT trigger (Ambrosi et al., GCN Circ. 45739).
No optical afterglow consistent with the XRT position
*** POSITION REFERENCE is GCN_Circulars-45746 ***
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           115          265          147         >20.0
u_FC               273          523          246         >19.1
white              115         1372          358         >20.9
v                  603         1249           78         >17.9
b                  529         1348           62         >18.2
u                  273         1323          304         >19.3
w1                 652         1299           55         >18.3
m2                1079         1099           19         >17.6
w2                 578          771           39         >18.3

The magnitudes in the table are not corrected for the Galactic extinction
due to the reddening of E(B-V) = 0.039 in the direction of the burst
(Schlegel et al. 1998).