NOTE: uvot_fluxes_wget.pl vrs. 2020-11-03a fem at 210506d15h58m07s440631usUT
NOTE: Source region spec. is: 132.853 +4.582 3"
NOTE: Used archived BAT position of 132.85300   4.58200
NOTE: position reference is GCN_Circ-29947

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

GRB 210506A: Swift/UVOT Upper Limits

S. R. Oates (U.Birmingham) and K. L. Page (***BA INSTITUTION***)
report on behalf of the Swift/UVOT team:

The Swift/UVOT began settled observations of the field of GRB 210506A
29140 s after the BAT trigger (***Author*** et al., GCN Circ. ????).
No optical afterglow consistent with the BAT position
*** POSITION REFERENCE is GCN_Circ-29947 ***
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

u                29140        45648         4999         >21.3

The magnitudes in the table are not corrected for the Galactic extinction
due to the reddening of E(B-V) = 0.060 in the direction of the burst
(Schlegel et al. 1998).