NOTE: uvot_fluxes_wget.pl vrs. 2024-08-27 fem at 250815d01h44m43s637492usUT
NOTE: Source region spec. is: 306.30792 48.39903 4"
NOTE: Used archived XRT position of 306.30792  48.39903  4.00
NOTE: position reference is GCN_Circulars-41379

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

GRB 250814A: Swift/UVOT Upper Limits

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

The Swift/UVOT began settled observations of the field of GRB 250814A
179 s after the BAT trigger (Caputo et al., GCN Circ. 41358).
No optical afterglow consistent with the XRT position
*** POSITION REFERENCE is GCN_Circulars-41379 ***
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               179          429          246         >20.3
white              460         1537          264         >21.8
v                  510         1412           97         >20.2
b                  436         1511          117         >20.2
u                  179         1486          343         >20.5
w1                 560         1462           97         >19.5
m2                 708         1263           58         >18.6
w2                 486         1556          130         >20.0

The magnitudes in the table are not corrected for the Galactic extinction
due to the reddening of E(B-V) = 1.066 in the direction of the burst
(Schlegel et al. 1998).