TITLE:   GCN CIRCULAR
NUMBER:  32302
SUBJECT: GRB 220627A: Swift/UVOT Upper Limits
DATE:    22/06/30 12:59:59 GMT
FROM:    Mike Siegel at PSU/Swift MOC  <mhs18@psu.edu>

M.H. Siegel (PSU) reports on behalf of the Swift/UVOT team:

The Swift/UVOT began settled observations of the field of GRB 220627A
130224 s after the LAT trigger (Di Lalla, et al., GCN Circ. 32283).
No optical afterglow consistent with the optical position (de Wet et al., 
GCN Circ. 32289, Izzo et al., GCN Circ. 33391) or X-ray afterglow
(Gropp et al., GCN Circ. 32296) 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

u               130224       148828         4854         >22.0

The magnitudes in the table are not corrected for the Galactic extinction
due to the reddening of E(B-V) = 0.047 in the direction of the burst
(Schlegel et al. 1998).