NOTE: uvot_fluxes_wget.pl vrs. 2024-08-27 fem at 250626d00h59m15s906319usUT
NOTE: Source region spec. is: 261.50887 22.26731 4"
NOTE: Used archived XRT position of 261.50887  22.26731  4.00
NOTE: position reference is GCN_Circulars-40827

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

GRB 250625A: Swift/UVOT Upper Limits

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

The Swift/UVOT began settled observations of the field of GRB 250625A
125 s after the BAT trigger (Ferro et al., GCN Circ. 40825).
No optical afterglow consistent with the XRT position
*** POSITION REFERENCE is GCN_Circulars-40827 ***
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           125          275          147         >20.9
u_FC               283          533          246         >20.3
white              125         1529          392         >21.7
v                  613         1579          117         >19.2
b                  539         1505           97         >20.4
u                  283         1480          324         >20.6
w1                 662         1628          117         >19.6
m2                 637         1431           78         >20.1
w2                 589         1383           97         >20.6

The magnitudes in the table are not corrected for the Galactic extinction
due to the reddening of E(B-V) = 0.054 in the direction of the burst
(Schlegel et al. 1998).