TITLE: GCN CIRCULAR NUMBER: 12860 SUBJECT: GRB 120119A: PAIRITEL NIR Detection DATE: 12/01/19 04:42:48 GMT FROM: Adam Morgan at U.C. Berkeley A. N. Morgan, and J. S. Bloom (UC Berkeley) report: We observed the field of GRB 120119A (Beardmore et al., GCN 12859) with the 1.3m PAIRITEL located at Mt. Hopkins, Arizona. Observations began at 2012-Jan-19 04h05m23s UT, ~53 seconds after the Swift trigger. In mosaics (effective exposure time of 560 seconds) taken simultaneously in the J, H, and Ks filters, we detect a source at the position of the optical afterglow. The preliminary photometry yields: post burst t_mid (m) exp.(s) filt mag m_err 10.3 560 J 14.35 0.02 10.3 560 H 13.10 0.02 10.3 560 Ks 11.95 0.02 All magnitudes are given in the Vega system, calibrated to 2MASS. No correction for Galactic extinction has been made to the above reported values. Observations are continuing. [GCN OPS NOTE(19jan11): Per author's request, the start time in the 3rd line was changed from "04h07m15s UT, ~2.7 minutes" to "04h05m23s UT, ~53 seconds".]