GCN Circular 19122

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

The Swift/UVOT began settled observations of the field of GRB 160227A
161 s after the BAT trigger (Siegel et al., GCN Circ. 19098
Not found
 
 
).
A source consistent with the XRT position
(Osborne et al. GCN Circ. 19104
Not found
 
 
)
is detected in the initial UVOT exposures but had faded away
in later exposures.

The preliminary UVOT position is:
   RA  (J2000) =  12:59:13.80 = 194.80750 (deg.)
   Dec (J2000) = +78:40:45.1  =  78.67920 (deg.)
with an estimated uncertainty of 0.46 arc sec. (radius, 90% confidence).

Preliminary detections and 3-sigma upper limits 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 (fc)         161          311          147         19.34 +/- 0.10
white              600         2418          341         19.80 +/- 0.13 
white             6755         8196          201        >20.82
v                  650         7366          400         19.40 +/- 0.25
b                  575         2393          194         19.71 +/- 0.35
b                 6550         8186          393        >20.10
u (fc)             319          569          245         19.44 +/- 0.20
u                  724         2368          174        >19.22
w1                 699         7776          540        >20.5
m2                1082         7570          432        >21.1
w2                1206         7161          294        >20.7

The magnitudes in the table are not corrected for the Galactic extinction
due to the reddening of E(B-V) = 0.05 in the direction of the burst
(Schlegel et al. 1998).