NOTE: uvot_fluxes_wget.pl vrs. 2020-11-03a fem at 210527d15h39m56s669335usUT
NOTE: Source region spec. is: 172.32083 31.62619 4"
NOTE: Used archived XRT position of 172.32083  31.62619  4.00
NOTE: position reference is GCN_Circulars-30083

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

GRB 210527A: Swift/UVOT Upper Limits

M. H. Siegel (PSU) 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 210527A
3164 s after the BAT trigger (Laha et al., GCN Circ. 30081).
No optical afterglow consistent with the XRT position
*** POSITION REFERENCE is GCN_Circulars-30083 ***
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          3164         3313          147         >20.2
white             3164         3932          344         >21.2
v                 4143         4343          197         >19.4
b                 3528         3727          197         >20.4
u                 3322         4895          331         >20.4
w1                4553         4753          197         >20.2
m2                4348         4548          197         >20.0
w2                3938         4138          197         >20.5

The magnitudes in the table are not corrected for the Galactic extinction
due to the reddening of E(B-V) = 0.023 in the direction of the burst
(Schlegel et al. 1998).