NOTE: uvot_fluxes_wget.pl vrs. 2020-11-03a fem at 210102d10h41m25s394041usUT
NOTE: Source region spec. is: 234.703 -84.189 3"
NOTE: Used archived BAT position of 234.70300 -84.18900
NOTE: position reference is GCN_Position_Notice

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

GRB 210102: Swift/UVOT Upper Limits

N. P. M. Kuin (UCL-MSSL) and ***BA*** (***BA INSTITUTION***)
report on behalf of the Swift/UVOT team:

The Swift/UVOT began settled observations of the field of GRB 210102
3940 s after the BAT trigger (***Author*** et al., GCN Circ. ????).
No optical afterglow consistent with the BAT position
*** POSITION REFERENCE is GCN_Position_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          3940         4089          147         >19.7
white             3940         5321          344         >20.3
v                 4096         5670          332         >18.8
b                 4916         5116          197         >19.4
u                 4711         4911          197         >18.9
w1                4506         4706          197         >19.0
m2                4301         4501          197         >19.1
w2                5327         5527          197         >19.5

The magnitudes in the table are not corrected for the Galactic extinction
due to the reddening of E(B-V) = 0.12 in the direction of the burst
(Schlegel et al. 1998).