GCN Circular 16541

M. H. Siegel (PSU) and F. E. Marshall (NASA/GSFC)
report on behalf of the Swift/UVOT team:

The Swift/UVOT began settled observations of the field of GRB 140706A
82 s after the BAT trigger (Marshall et al., GCN Circ. 16531
Not found
 
 
).
A fading source consistent with the XRT position
(Beardmore et al. GCN Circ. 16532
Not found
 
 
)
is detected in the initial UVOT exposures.

The preliminary UVOT position is:
  RA  (J2000) =  03:17:10.39 =  49.29328 (deg.)
  Dec (J2000) = -38:03:07.8  = -38.05218 (deg.)
with an estimated uncertainty of 0.45 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)          82          232          147         19.04 +/- 0.06
white              573         1541          244         19.76 +/- 0.16
v                  624         1592          117        >18.8
b                  550         1517           97        >19.2
u (fc)             294          544          246         19.02 +/- 0.11
u                  624         1591          116        >19.6
w1                 674         1638           94        >19.1
w2                 775         1394           58        >20.1

The magnitudes in the table are not corrected for the Galactic extinction
due to the reddening of E(B-V) = 0.02 in the direction of the burst
(Schlegel et al. 1998).