NOTE: uvot_fluxes_wget.pl vrs. 2024-08-27 fem at 251011d16h38m35s955915usUT
NOTE: Source region spec. is: 13.23471 -62.03339 4"
NOTE: Used archived XRT position of  13.23471 -62.03339  4.00
NOTE: position reference is GCN_Circulars-42201

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

GRB 251011B: Swift/UVOT Upper Limits

***UBS*** (***INSTITUTION***) and A. D'Ai (INAF-IASFPA)
report on behalf of the Swift/UVOT team:

The Swift/UVOT began settled observations of the field of GRB 251011B
107 s after the BAT trigger (D'Ai et al., GCN Circ. 42197).
No optical afterglow consistent with the XRT position
*** POSITION REFERENCE is GCN_Circulars-42201 ***
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           107          257          147         >20.9
white              107          257          147         >20.9
u                  320          463          141         >20.4

The magnitudes in the table are not corrected for the Galactic extinction
due to the reddening of E(B-V) = 0.017 in the direction of the burst
(Schlegel et al. 1998).