NOTE: uvot_fluxes_wget.pl vrs. 2018-11-07 fem at 190801d20h20m06s811226usUT
NOTE: Source region spec. is: 339.940 -76.620 3"
NOTE: Used archived BAT position of 339.94000 -76.62000
NOTE: position reference is GCN_Circ-25248

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

GRB 190731A: Swift/UVOT Upper Limits

S. R. Oates (U.Warwick) and S. Dichiara (***BA INSTITUTION***)
report on behalf of the Swift/UVOT team:

The Swift/UVOT began settled observations of the field of GRB 190731A
33372 s after the LAT trigger (***Author*** et al., GCN Circ. ????).
No optical afterglow consistent with the LAT position
*** POSITION REFERENCE is GCN_Circ-25248 ***
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                39548        40152          590         >19.8
b                45350        45715          355         >20.5
w2               33372        33977          596         >20.3

The magnitudes in the table are not corrected for the Galactic extinction
due to the reddening of E(B-V) = 0.13 in the direction of the burst
(Schlegel et al. 1998).