GCN Circular 14859

M. H. Siegel (PSU) and J. R. Cummings (NASA/UMBC)
report on behalf of the Swift/UVOT team:

The Swift/UVOT began settled observations of the field of GRB 130610A
140 s after the BAT trigger (Cummings et al., GCN Circ. 14842
Not found
 
 
).
A fading source consistent with the XRT position (Cummings et al. GCN Circ. 14842
Not found
 
 
)
is detected in the initial UVOT exposures.

The preliminary UVOT position is:
   RA  (J2000) =  14:57:40.88 = 224.42034 (deg.)
   Dec (J2000) = +28:12:25.8  =  28.20717 (deg.)
with an estimated uncertainty of 0.51 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 listed below.
The lack of detection in the NUV filters would be consistent with the z=2.1 redshift 
reported by Smette et al. (GCN Circ. 14848
Not found
 
 
).

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

white (fc)       140         290        147     17.85+-0.04
white           1491        1857         58     19.56+-0.19
white           5267        6902        393     20.47+-0.15
v               1540        7312        451    >20.07
b               1467        2005         77     19.12+-0.20
b               6498       19320       1754     21.72+-0.38
u                298         441        140     17.67+-0.09
u               1614        1980         58     19.00+-0.30
uvw1            1589        1956         58    >19.05
uvm2            1911       23463       1298    >21.09
uvw2            1863        7108        412    >20.63

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).