NOTE: uvot_fluxes_wget.pl vrs. 2020-10-16 fem at 201017d15h08m07s003548usUT
NOTE: Source region spec. is: 36.62008 66.67878 4"
NOTE: Used archived XRT position of  36.62008  66.67878  4.00
NOTE: position reference is GCN_Circulars-28671

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

GRB 201017A: Swift/UVOT Upper Limits

S. J. LaPorte (PSU) and A. D'Ai (INAF-IASFPA)
report on behalf of the Swift/UVOT team:

The Swift/UVOT began settled observations of the field of GRB 201017A
106 s after the BAT trigger (D'Ai et al., GCN Circ. 28666).
No optical afterglow consistent with the XRT position
(Goad et al. GCN Circ. 28671)
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           106          256          147         >20.7
u_FC               264          514          246         >20.6
white              106         4492          363         >21.0
v                  595         4903          216         >19.5
b                  520         4288          216         >20.5
u                  264          683          260         >20.6
w1                5114         5236          121         >19.6
w2                4499         4698          197         >19.6

The magnitudes in the table are not corrected for the Galactic extinction
due to the reddening of E(B-V) = 1.20 in the direction of the burst
(Schlegel et al. 1998).