NOTE: uvot_fluxes_wget.pl vrs. 2020-11-03a fem at 201201d19h31m49s614672usUT
NOTE: Source region spec. is: 339.354 -49.246 3"
NOTE: Used archived BAT position of 339.35400 -49.24600
NOTE: position reference is GCN_Circ-28971

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

GRB 201128B: 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 201128B
246188 s after the BAT trigger (***Author*** et al., GCN Circ. ????).
No optical afterglow consistent with the BAT position
*** POSITION REFERENCE is GCN_Circ-28971 ***
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 first
finding chart (FC) exposure and subsequent exposures are:

Filter         T_start(s)   T_stop(s)      Exp(s)         Mag

white_FC        246188       246326          136         >20.0
white           246188       247558         1345         >21.6

The magnitudes in the table are not corrected for the Galactic extinction
due to the reddening of E(B-V) = 0.016 in the direction of the burst
(Schlegel et al. 1998).