GCN Circular 14619

S. T. Holland (STScI) reports on behalf of the Swift/UVOT team:

     The Swift/UVOT began settled observations of the field of GRB
130508A starting 136 s after the BAT trigger (Holland et al. 2013,
GCNC 14607).  We do not detect any new source consistent with the
UVOT-enhanced XRT position (Evans 2013, GCNC 14614) in any of the UVOT
exposures.  Preliminary 3-sigma upper limits using the UVOT
photometric system (Breeveld et al. 2011, AIP Conf. Proc. 1358, 373)
for the finding chart (FC) exposures and initial summed exposures are
presented below.

Filter       TSTART     TSTOP   Exposure      Mag
-------------------------------------------------
white (FC)      136       285        147    >20.8
u (FC)          296       545        246    >19.8
-------------------------------------------------
v              4416      5642        393    >20.0
b               551      6336        288    >20.5
u               296      6257        639    >20.5
uvw1           4417      6052        393    >20.3
uvm2           4212      5847        393    >20.3
uvw2           3801      5437        393    >20.5
white           136      5231        344    >21.5
-------------------------------------------------

     The quoted upper limits have not been corrected for the expected
extinction due to the Galactic reddening along the line of sight to
this burst of E(B-V) = 2.54 mag (Schlafly et al. 2011, ApJS, 737,
103).