NOTE: uvot_fluxes_wget.pl vrs. 2018-11-07 fem at 190601d06h49m12s138392usUT
NOTE: Source region spec. is: 24.29621 -41.95842 4"
NOTE: Used archived XRT position of  24.29621 -41.95842  4.00
NOTE: position reference is GRB_Auto_Processing

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

GRB 190531: 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 190531
18175 s after the LAT trigger (***Author*** et al., GCN Circ. ????).
No optical afterglow consistent with the XRT position
*** POSITION REFERENCE is GRB_Auto_Processing ***
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

b                18661        24137          365         >20.5
u                18497        29702          551         >21.1
w1               18175        29509         1132         >20.7
m2               19630        25766          972         >20.9
w2               18826        24990         1459         >21.3

The magnitudes in the table are not corrected for the Galactic extinction
due to the reddening of E(B-V) = 0.01 in the direction of the burst
(Schlegel et al. 1998).