GCN Circular 24889

M. H. Siegel (PSU) and E. Sonbas (Adiyaman Univ.)
report on behalf of the Swift/UVOT team:

The Swift/UVOT began settled observations of the field of GRB 190627A
115 s after the BAT trigger (Sonbas et al., GCN Circ. 24888
Not found
 
 
).
An uncatalogued source consistent with the BAT position
is detected in the initial UVOT exposures.

The preliminary UVOT position is:
   RA  (J2000) =  16:19:18.69 = 244.82788 (deg.)
   Dec (J2000) = -05:17:20.8  =  -5.28912 (deg.)
with an estimated uncertainty of 0.46 arc sec. (radius, 90% confidence).

Preliminary detections using the UVOT photometric system
(Breeveld et al. 2011, AIP Conf. Proc. 1358, 373) for the early exposures are: 

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

white              115          144           29         18.15 +/- 0.10

The magnitudes in the table are not corrected for the Galactic extinction
due to the reddening of E(B-V) = 0.18 in the direction of the burst
(Schlegel et al. 1998).