GCN Circular 8820
A. Rossi (Tautenburg Obs.), F. Olivares (MPE Garching), A. Kupcu Yoldas (ESO), J. Greiner, and A. Yoldas (both MPE Garching) report on behalf of the GROND team: We observed the field of GRB 090117 (SuperAGILE trigger, Donnarumma et al. GCN #8817) simultaneously in g'r'i'z'JHK with GROND (Greiner et al. 2008, PASP 120, 405) mounted at the 2.2m MPI/ESO telescope at La Silla (Chile). Observations started at 01:40 UT, about 9 hrs after the GRB. We do not detect any new sources within the 5-sigma Swift/XRT error circle (Breadmore & Evans, GCN #8818). Note that there is a R~16 magnitude star within the XRT position contaminating the search for the GRB afterglow. Co-added images of the first 8 minutes yield the following specific limits (in AB magnitudes): g' > 23.7 r' > 24.1 i' > 23.2 z' > 22.2 J > 21.9 H > 20.9 K > 20.3 The magnitudes are calibrated against the GROND zeropoints and 2MASS field stars.