TITLE: GCN CIRCULAR NUMBER: 11337 SUBJECT: GRB 101011A, GROND upper limits DATE: 10/10/12 13:43:38 GMT FROM: Sylvio Klose at TLS Tautenburg M. Nardini, T. Kruehler (both MPE Garching), S. Klose, A. Rossi (both TLS Tautenburg), and J. Greiner (MPE Garching) report on behalf of the GROND team: We observed the field of GRB 101011A (Swift trigger #436094; Cannizzo et al. 2010, GCN #11331; Markwardt et al. 2010, GCN #11332) 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 on LaSilla. Observations started at 00:10 UT, October 12, i.e. seven hours after the burst once the field became visible over La Silla. In stacked images with a mid-time of 1:06 UT (seeing 2.2 arcsec; mean airmass 1.8) we do not detect any source at the position of the faint optical transient seen by UVOT (Holland et al. 2010, GCN #11334) down to the following limits (3 sigma, AB system): g' > 24.4, r' > 23.7, i' > 22.7, z' > 22.5, J > 22.1, H > 21.5. These upper limits have been calibrated based on USNO and 2MASS stars.