NOTE: uvot_fluxes_wget.pl vrs. 2020-11-03a fem at 220413d02h10m37s428420usUT
NOTE: Source region spec. is: 320.794 -0.223 3"
NOTE: Used archived BAT position of 320.79400  -0.22300
NOTE: position reference is GCN_Position_Notice
WARNING: t_start for light curve (3968) and t_start from the exposure report (89) do not agree.
  Replace ??? in draft Circular with correct value.
WARNING: Did not recognize UBS name.

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

GRB 220412B: Swift/UVOT Upper Limits

PSU (***INSTITUTION***) and J. D. Gropp (PSU)
report on behalf of the Swift/UVOT team:

The Swift/UVOT began settled observations of the field of GRB 220412B
***???*** s after the BAT trigger (Gropp et al., GCN Circ. 31886).
No optical afterglow consistent with the BAT position
*** POSITION REFERENCE is GCN_Position_Notice ***
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 initial exposures are:

Filter         T_start(s)   T_stop(s)      Exp(s)         Mag

white             4378         4577          197         >20.3
b                 4173         4373          197         >19.8
u                 3968         4167          197         >19.4
w2                4584         4663           78         >19.2

The magnitudes in the table are not corrected for the Galactic extinction
due to the reddening of E(B-V) = 0.060 in the direction of the burst
(Schlegel et al. 1998).