TITLE: GCN CIRCULAR NUMBER: 15170 SUBJECT: GRB 130903A: GROND Upper Limits DATE: 13/09/03 12:20:34 GMT FROM: Alexander Kann at TLS Tautenburg V. Sudilovsky, D. A. Kann, and J. Greiner (all MPE Garching) report on behalf of the GROND team: We observed the field of GRB 130903A (INTEGRAL trigger 6930; Mereghetti et al. 2013, GCN #15169) simultaneously in g'r'i'z'JHK with GROND (Greiner et al. 2008, PASP 120, 405) mounted at the 2.2 m MPG/ESO telescope at La Silla Observatory (Chile). Observations started at 07:07 UT on 03 Sep. 2013, 6.3 hours after the GRB trigger, as soon as the GRB field became visible. They were performed at an average seeing of 1".5 and at an average airmass of 1.7. Based on an image with an exposure time of 25 min in g'r'i'z' and 20 min in JHK, centered 7.37 hours after the GRB, we do not detect any uncatalogued sources within the 90 arcsec INTEGRAL error circle in comparison to the SDSS and 2MASS catalogs.