TITLE: GCN CIRCULAR NUMBER: 12863 SUBJECT: GRB 120119A: GROND Detection of the Optical/NIR Afterglow DATE: 12/01/19 05:27:34 GMT FROM: Patricia Schady at MPE/Swift P. Schady, V. Sudilovsky, J. Greiner (all MPE Garching) and T.Kruehler (DARK/NBI) report on behalf of the GROND team: We observed the field of GRB 120119A (Swift trigger 512035; Beardmore et al., GCN #12859) 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 at La Silla Observatory (Chile). Observations started at 04:08 UT, 3.5 min after the GRB trigger, and are continuing. They were performed at an average seeing of 0.9" and at an average airmass of 1.0. We found a single point source consistent with the UVOT afterglow position. Based on the first 2.4 min of total exposures in g'r'i'z' and 4 min in JHK, we estimate preliminary magnitudes (all in AB) of g' = 18.8 +- 0.1 mag, r' = 17.7 +- 0.1 mag, i' = 16.8 +- 0.1 mag, z' = 16.2 +- 0.1 mag, J = 15.2 +- 0.1 mag, H = 14.6 +- 0.1 mag and K = 14.0 +- 0.1mag Given magnitudes are calibrated against SDSS zeropoints as well as 2MASS field stars and are not corrected for the expected Galactic foreground extinction corresponding to a reddening of E_(B-V)=0.11 mag in the direction of the burst (Schlegel et al. 1998).