NOTE: uvot_fluxes_wget.pl vrs. 2018-11-07 fem at 201001d14h30m29s097247usUT
NOTE: Source region spec. is: 110.08087 -2.21103 4"
NOTE: Used archived XRT position of 110.08087  -2.21103  4.00
NOTE: position reference is GCN_Circulars-28540

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

GRB 201001A: Swift/UVOT Upper Limits

A. Belles (PSU) and K. K. Simpson (PSU)
report on behalf of the Swift/UVOT team:

The Swift/UVOT began settled observations of the field of GRB 201001A
120 s after the BAT trigger (Simpson et al., GCN Circ. 28539).
No optical afterglow consistent with the XRT position
(Evans et al. GCN Circ. 28540)
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           120          270          147         >21.1
u_FC               279          529          246         >19.7
white              120         1525          392         >21.0
v                  611         1575          117         >18.6
b                  535         1501           97         >19.1
u                  279         1476          324         >19.4
w1                 660         5152          152         >19.4
m2                 635         5089          294         >20.1
w2                 586         1550          117         >19.3

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).