NOTE: uvot_fluxes_wget.pl vrs. 2024-08-27 fem at 250805d18h37m21s379027usUT
NOTE: Source region spec. is: 24.21208 -81.40175 4"
NOTE: Used archived XRT position of  24.21208 -81.40175  4.00
NOTE: position reference is GCN_Circulars-41238

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

GRB 250805A: 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 250805A
3536 s after the BAT trigger (Ambrosi et al., GCN Circ. 41233).
No optical afterglow consistent with the XRT position
*** POSITION REFERENCE is GCN_Circulars-41238 ***
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          3536         3686          147         >21.3
white             3536         4306          344         >21.7
b                 3902         4101          197         >20.9
u                 3696         3895          197         >20.6
w2                4312         4460          146         >20.7

The magnitudes in the table are not corrected for the Galactic extinction
due to the reddening of E(B-V) = 0.092 in the direction of the burst
(Schlegel et al. 1998).