Nicuesa Guelbenzu, A. (TLS Tautenburg), J. Greiner, Varela, K. (MPE
Garching), S. Klose, D. A. Kann (TLS Tautenburg) report on behalf of the
We observed the field of GRB 130605A (Swift trigger 557508; Holland et
al., GCN 14773) simultaneously in g'r'i'z'JHK with GROND (Greiner et al.
2008, PASP 120, 405) mounted at the 2.2m MPG/ESO telescope at La Silla
Observations started at 23:44:36 UT on June 6, about 3 min after the GRB
trigger. Inside the BAT error circle (Holland et al., GCN 14773) we find a
source at coordinates RA, DEC (J2000) = 08:58:08.6, -33:27:40.3 which has
no counterpart on the DSS2 red. We measure the following preliminary AB
magnitude (mean time 23:47:39)
r' = 15.8 +/- 0.1,
calibrated against GROND zeropoints and 2MASS stars. We suggest that this
is the GRB afterglow.