NOTE: uvot_fluxes_wget.pl vrs. 2018-11-07 fem at 200819d09h20m08s187969usUT
NOTE: Source region spec. is: 15.82954 -73.84558 4"
NOTE: Used archived XRT position of  15.82954 -73.84558  4.00
NOTE: position reference is GCN_Circulars-28241

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

GRB 200809B: 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 200809B
14038 s after the GBM/GUANO trigger (***Author*** et al., GCN Circ. ????).
No optical afterglow consistent with the XRT position
(Perri et al. GCN Circ. 28241)
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                14697        19599           84         >19.8
b                14288        19189          157         >20.6
u                14203        19105          157         >19.6
w1               14038        19021          314         >19.5
m2               19603        20174          562         >19.2
w2               14373        19515          629         >19.4

The magnitudes in the table are not corrected for the Galactic extinction
due to the reddening of E(B-V) = 0.04 in the direction of the burst
(Schlegel et al. 1998).