NOTE: uvot_fluxes_wget.pl vrs. 2020-11-03a fem at 230206d11h24m43s237295usUT
NOTE: Source region spec. is: 197.58 -21.75 3"
NOTE: Used archived BAT position of 197.58000 -21.75000
NOTE: position reference is GCN_Notice

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

GRB 230204: 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 230204
80403 s after the MAXI trigger (***Author*** et al., GCN Circ. ????).
No optical afterglow consistent with the MAXI position
*** POSITION REFERENCE is GCN_Notice ***
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

v                81062       109630          314         >19.1
b                80652       109220          314         >20.1
u                80567       109136          314         >19.8
w1               80403       109052          629         >20.1
m2               81146       109877         2154         >20.9
w2               80737       109546         1259         >20.7

The magnitudes in the table are not corrected for the Galactic extinction
due to the reddening of E(B-V) = 0.109 in the direction of the burst
(Schlegel et al. 1998).