NOTE: uvot_fluxes_wget.pl vrs. 2024-08-27 fem at 251103d22h02m22s060730usUT
NOTE: Source region spec. is: 105.87338 -24.87217 4"
NOTE: Used archived XRT position of 105.87338 -24.87217  4.00
NOTE: position reference is GCN_Circulars-42558

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

GRB 251103B: Swift/UVOT Upper Limits

***UBS*** (***INSTITUTION***) and Lanava (PSU)
report on behalf of the Swift/UVOT team:

The Swift/UVOT began settled observations of the field of GRB 251103B
140 s after the BAT trigger (Lanava et al., GCN Circ. 42556).
No optical afterglow consistent with the XRT position
*** POSITION REFERENCE is GCN_Circulars-42558 ***
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

u_FC               140          390          246         >20.7
white              420         1363          245         >21.4
v                  470         1413          117         >19.5
b                  395         1339           97         >20.3
u                  140         1487          343         >20.7
w1                 519         1462           97         >19.5
m2                 494         1437          117         >19.0
w2                 445         1389          117         >19.9

The magnitudes in the table are not corrected for the Galactic extinction
due to the reddening of E(B-V) = 0.256 in the direction of the burst
(Schlegel et al. 1998).