GCN Circular 14680

S. B. Cenko (UC Berkeley) reports on behalf of a larger collaboration:

We have imaged the location of the Fermi GBM (Xiong et al., GCN 14674
Not found
 
 
),
LAT (Omodei et al., GCN 14675
Not found
 
 
), Swift BAT (Cummings et al., GCN 14676
Not found
 
 
),
and Konus-Wind (Golenetskii et al., GCN 14677
Not found
 
 
) GRB 130518A with the
robotic Palomar 60 inch telescope.  Observations were obtained in the r'
and i' filters beginning at 10:24 UT on 2013 May 19 (~ 0.85 d after the
GBM trigger).

We detect the optical afterglow (Evans et al., GCN 14678
Not found
 
 
; Troja et al.,
GCN 14679
Not found
 
 
) in both filters.  Using several nearby point sources from SDSS
for calibration, we measure a magnitude of r' = 19.3 at this time.