GCN Circular 11583
A. N. Morgan, C. R. Klein, and J. S. Bloom (UC Berkeley) report: We observed the field of GRB 110119A (Troja et al., GCN 11581) with the 1.3m PAIRITEL located at Mt. Hopkins, Arizona. Observations began at 2011-Jan-20 01h24m08s UT, ~3.1 hours after the Swift Trigger, under high airmass (~1.9), and continued until the source set beyond telescope limits. In mosaics (effective exposure time of 0.64 hours) taken simultaneously in the J, H, and Ks filters, we detect a source at the UVOT position (Troja et al., GCN 11581). The preliminary photometry yields: post burst t_mid (hr) exp.(hr) filt mag m_err 3.78 0.64 J 17.9 0.2 3.78 0.64 H 17.0 0.2 3.78 0.64 Ks 16.2 0.2 All magnitudes are given in the Vega system, calibrated to 2MASS. No correction for Galactic extinction has been made to the above reported values.