NOTE: uvot_fluxes_wget.pl vrs. 2020-11-03a fem at 210210d01h05m22s703053usUT
NOTE: Source region spec. is: 328.1238 +43.5570 4"
NOTE: Used archived XRT position of 328.12380  43.55700  4.00
NOTE: position reference is GCN_Notice

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

GRB 210209A: Swift/UVOT Upper Limits

A. A. Breeveld (UCL-MSSL) and S. L. Laha (GSFC/UMBC/CRESST)
report on behalf of the Swift/UVOT team:

The Swift/UVOT began settled observations of the field of GRB 210209A
127 s after the BAT trigger (Laha et al., GCN Circ. 29442).
No optical afterglow consistent with the XRT 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 first
finding chart (FC) exposure and subsequent exposures are:

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

white_FC           127          276          147         >20.3
u_FC               285          535          246         >19.4
white              127          952          275         >20.4
v                  615         4730          236         >19.1
b                  540          733           39         >18.8
u                  285         5225          345         >19.8
w1                 664         5140          236         >19.7
m2                 639         4934          236         >19.4
w2                 590         4525          236         >20.5

The magnitudes in the table are not corrected for the Galactic extinction
due to the reddening of E(B-V) = 0.286 in the direction of the burst
(Schlegel et al. 1998).