NOTE: uvot_fluxes_wget.pl vrs. 2020-11-03a fem at 210404d03h03m47s344601usUT
NOTE: Source region spec. is: 198.25925 44.51453 4"
NOTE: Used archived XRT position of 198.25925  44.51453  4.00
NOTE: position reference is GCN_Circulars-29750
WARNING: t_start for light curve (163) and t_start from the exposure report (118) do not agree.
  Replace ??? in draft Circular with correct value.

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

GRB 210402A: Swift/UVOT Upper Limits

S. J. LaPorte (PSU) and ***BA*** (***BA INSTITUTION***)
report on behalf of the Swift/UVOT team:

The Swift/UVOT began settled observations of the field of GRB 210402A
***???*** s after the BAT trigger (***Author*** et al., GCN Circ. ????).
No optical afterglow consistent with the XRT position
(Evans et al. GCN Circ. 29750)
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           163          313          147         >20.8
u_FC               321          571          246         >20.3
white              163         1718          411         >21.4
v                  653         5581          229         >19.6
b                  578         1694          117         >20.2
u                  321         1669          304         >20.2
w1                1108         1644           78         >19.2
w2                1207         1227           19         >18.4

The magnitudes in the table are not corrected for the Galactic extinction
due to the reddening of E(B-V) = 0.018 in the direction of the burst
(Schlegel et al. 1998).