NOTE: uvot_fluxes_wget.pl vrs. 2018-11-07 fem at 201006d21h45m23s347710usUT
NOTE: Source region spec. is: 61.89271 65.16461 4"
NOTE: Used archived XRT position of  61.89271  65.16461  4.00
NOTE: position reference is GCN_Circulars-28562

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

GRB 201006A: Swift/UVOT Upper Limits

F. E. Marshall (NASA/GSFC) and J. D. Gropp (PSU)
report on behalf of the Swift/UVOT team:

The Swift/UVOT began settled observations of the field of GRB 201006A
88 s after the BAT trigger (Gropp et al., GCN Circ. 28560).
No optical afterglow consistent with the XRT position
(Goad et al. GCN Circ. 28562)
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            88          238          147         >21.1
u_FC               300          549          246         >20.2
white               88         1539          385         >21.0
v                  629         5189          164         >19.4
b                  555         1521           97         >19.8
u                  300          722          265         >20.3
w1                 678         1472           97         >18.7
w2                1205         5116          216         >19.6

The magnitudes in the table are not corrected for the Galactic extinction
due to the reddening of E(B-V) = 1.27 in the direction of the burst
(Schlegel et al. 1998).