GCN Circular 11421
J. Elliott, R. Filgas, J. Greiner, P. Schady and T. Kruehler (all MPE Garching) report on behalf of the GROND team: We observed the field of GRB 101117B (Swift trigger 438675; Wolf et al., GCN #11411) 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 05:15 UT on November 19, 34 hours after the GRB trigger, and have total exposure of 6003 s in g'r'i'z' and 4800 s in JHK. They were performed at an average seeing of 2.0" and at an average airmass of 1.8. We do not detect a source within the UVOT error circle reported by Holland & Wolf (GCN #11420) down to the following 3 sigma upper limits (all in AB): g' > 23.7 r' > 23.8 i' > 23.5 z' > 23.3 J > 21.7, H > 21.2 and K > 20.4 The given limits are derived based on calibrating the images against GROND zeropoints and 2MASS field stars and are not corrected for the Galactic foreground extinction corresponding to a reddening of E_(B-V)= 0.38 in the direction of the burst (Schlegel et al. 1998).