GCN Circular 10956
M. Nardini, T. Kruehler, and J. Greiner (all MPE Garching) report on behalf of the GROND team: We observed the field of GRB 100713A (INTEGRAL trigger 6041; Mereghetti et al., GCN #10951) simultaneously in g'r'i'z'JHK with GROND (Greiner et al. 2008, PASP 120, 405) mounted at the 2.2 m MPI/ESO telescope at La Silla Observatory (Chile). Observations started at 23:46 UT on 2010 July 13th, 9.3 h after the GRB trigger. They were performed at an average seeing of 2.6" and at an average airmass of 2.5. With a total integration time of 13.2 min (12 min for the IR), we do not detect any source within the Swift-XRT error circle reported by D'Elia et al. (GCN #10952) down to g' > 23.8, r' > 22.9, i' > 22.0, z' > 21.5, J > 18.8, H > 17.4 and K > 16.8 The given limits are derived based on calibrating the images against USNO B1 catalogue and 2MASS field stars and are not corrected for the Galactic foreground extinction corresponding to a reddening of E_(B-V)= 0.056 in the direction of the burst (Schlegel et al. 1998). We confirm the presence of a faint source close to the border of the XRT error circle at the coordinates reported by D'Avanzo et al. (GCN 10954).