GCN Circular 13648
V. Sudilovsky (MPE Garching), D. A. Kann (TLS Tautenburg) and J. Greiner (MPE Garching) report on behalf of the GROND team: We observed the field of GRB 120815A (Swift trigger 531003; Pagani et al., GCN 13645) simultaneously in g'r'i'z'JHKs 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 150 seconds after the BAT trigger, and were obtained at airmass 1.1 and a mean seeing of 1".3. Based on exposures of 142 seconds in g'r'i'z' and 240 seconds in JHK centered 348 seconds after the trigger, we detect an uncataloged source in all bands at RA (J2000): 18:15:49.82 DEC (J2000): -52:07:52.1 with an uncertainty of 0.3". This position is close to the Swift XRT position (J. A. Kennea et al., GCN 13647). We measure a preliminary magnitude: i' ~ 17.6 The magnitudes are derived based on GROND zeropoints (g'r'i'z') and 2MASS stars (JHK).