NOTE: uvot_fluxes_wget.pl vrs. 2018-11-07 fem at 200623d21h37m31s618157usUT
NOTE: Source region spec. is: 242.0952 +53.46788 3"
NOTE: Used archived BAT position of 242.09520  53.46788
NOTE: position reference is GCN_Circ-28013

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

GRB 200623A: Swift/UVOT Upper Limits

A. A. Breeveld (UCL-MSSL) and K. K. Simpson (***BA INSTITUTION***)
report on behalf of the Swift/UVOT team:

The Swift/UVOT began settled observations of the field of GRB 200623A
37910 s after the GBM trigger (***Author*** et al., GCN Circ. ????).
No optical afterglow consistent with the GBM position
*** POSITION REFERENCE is GCN_Circ-28013 ***
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

white            37910        45836         4299         >22.7

The magnitudes in the table are not corrected for the Galactic extinction
due to the reddening of E(B-V) = 0.012 in the direction of the burst
(Schlegel et al. 1998).