NOTE: uvot_fluxes_wget.pl vrs. 2020-11-03a fem at 210827d05h19m57s233293usUT
NOTE: Source region spec. is: 45.300 -71.700 3"
NOTE: Used archived BAT position of  45.30000 -71.70000
NOTE: position reference is GCN_Notice

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

GRB 210826A: Swift/UVOT Upper Limits

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

The Swift/UVOT began settled observations of the field of GRB 210826A
36747 s after the LAT trigger (***Author*** et al., GCN Circ. ????).
No optical afterglow consistent with the LAT position
*** POSITION REFERENCE is GCN_Notice ***
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                36747        49716         4869         >20.7

The magnitudes in the table are not corrected for the Galactic extinction
due to the reddening of E(B-V) = 0.032 in the direction of the burst
(Schlegel et al. 1998).