TITLE: GCN CIRCULAR NUMBER: 15214 SUBJECT: GRB 130912A: GROND observations DATE: 13/09/12 11:49:50 GMT FROM: Vladimir Sudilovsky at MPE M. Tanga (MPE Garching), S. Klose (TLS Tautenburg), V. Sudilovsky (MPE Garching), R. Filgas (IEAP Prague), J. Greiner (MPE Garching) report on behalf of the GROND team: We observed the field of GRB 130912A (Swift trigger 570465; D'Elia et al. 2013, GCN #15212) 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 08:50 UT on 12 Sep 2013, 16 min after the GRB trigger. At the northern edge of the r=2.2 arcsec XRT error circle (D'Elia et al., GCN #15173) we detect a faint source at coordinates RA (J2000) = 03:10:22.23 Dec. (J2000) = 13:59:48.7 with an error of 0".3 arcseconds. However, the object seems to be constant over the first hour of our observations, with a preliminary magnitude of r' = 22.0+-0.2 mag, calibrated against the GROND zeropoint. Given the constant flux, this might be the host galaxy of GRB 130912A.