NOTE: uvot_fluxes_wget.pl vrs. 2023-03-23 fem at 230830d07h55m16s674907usUT
NOTE: Source region spec. is: 299.63977 54.46334 3"
NOTE: Used archived opt source position of 299.63977  54.46334  3.00
NOTE: position reference is GCN_Circulars-34574

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

GRB 230827B: Swift/UVOT Upper Limits

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

The Swift/UVOT began settled observations of the field of GRB 230827B
231275 s after the BAT trigger (***Author*** et al., GCN Circ. ????).
No optical afterglow consistent with the optical position
*** POSITION REFERENCE is GCN_Circulars-34574 ***
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 initial exposures are:

Filter         T_start(s)   T_stop(s)      Exp(s)         Mag

m2              243698       249694         1317         >21.3
w2              231275       238306         2441         >21.2

The magnitudes in the table are not corrected for the Galactic extinction
due to the reddening of E(B-V) = 0.222 in the direction of the burst
(Schlegel et al. 1998).