TITLE: GCN CIRCULAR NUMBER: 12731 SUBJECT: GRB 111225A: PAIRITEL NIR Upper Limits DATE: 11/12/26 06:06:41 GMT FROM: Adam Morgan at U.C. Berkeley A. N. Morgan (UC Berkeley) reports: We observed the field of GRB 111225A (Siegel et al., GCN 12720) with the 1.3m PAIRITEL located at Mt. Hopkins, Arizona. Observations began at 2011-12-26 01h13m05 UT, ~21.35 hr after the Swift Trigger. In mosaics taken simultaneously in the J, H, and Ks filters, we do not detect the optical afterglow (Siegel et al., GCN 12720; Klotz et al., GCN 12722; Updike et al., GCN 12723; Xin et al., GCN 12725; Gorosabel et al., GCN 12728). The preliminary photometry yields: post burst t_mid(h) exp.(s) filt U. Limit (3 sig) 22.45 4774 J > 18.4 22.45 4774 H > 17.6 22.45 4774 Ks > 16.9 All magnitudes are given in the Vega system, calibrated to 2MASS. No correction for Galactic extinction has been made to the above reported values.