GCN Circular 11662

E. A. Hoversten (PSU) and P. A. Evans (U. Leicester) report on behalf of
the Swift UVOT team:

We have analyzed Swift UVOT observations of the INTEGRAL-detected
GRB 110206A (Mereghetti et al. et al. GCN Circ. 11654
Not found
 
 
).  UVOT  
observations
began 26.9 ks after the INTEGRAL trigger.  The UVOT data reveal a  
faint new
source that does not appear in archival MAST DSS images.  The refined  
UVOT
position of the new source is:

      RA (J2000)  06:09:20.14  =  92.33392 (deg)
     Dec (J2000) -58:48:25.3   =  -58.80703 (deg)

with an estimated uncertainty of 0.8 arcsec (radius, 90% confidence,
statistical + systematic).  This position is within 0.2 arcseconds of  
the
enhanced XRT position (Evans, GCN Circ. 11657
Not found
 
 
) which is well within the
measurement errors.

The source is detected in the uvw1, u, and b filters, while an upper  
limit
was found in uvm2.  The observed magnitudes and 3-sigma upper limits  
using
the UVOT photometric system (Poole et al. 2008, MNRAS, 383, 627) are:

Filter  T_start(s)  T_stop(s)   Exp(s)     Mag
=============================================================
b        28761       29253       480   21.00 +/- 0.37
u        27847       34952      1044   20.56 +/- 0.24
uvw1     26941       34783      1771   20.36 +/- 0.26
uvm2     32977       33876       885      > 20.61

The values quoted above 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).