TITLE: GCN CIRCULAR NUMBER: 13279 SUBJECT: GRB 120422A: P200 NIR detection DATE: 12/05/03 03:21:57 GMT FROM: Daniel Perley at Caltech D. A. Perley, T. Jones, and R. Ellis (Caltech) report: We observed the field of GRB 120422A (Troja et al., GCN 13243) with the Wide-field IR Camera (WIRC) on the Palomar 200-inch telescope between 04:01 and 05:04 UT on 2012-05-02. 15 exposures of 240s each (1 hour of observations total) were acquired in the J-band filter. The optical counterpart to GRB 120422A (at this stage probably a rising supernova; GCNs 13275, 13276, 13277) is clearly detected in the combined image. Seeing conditions were good and the transient is resolved from its host galaxy, although the background is affected by scattered light from the bright star 1 arcmin to the northwest. Using a 0.8 arcsec radius aperture, we measure a magnitude of J = 20.7 +/- 0.2 at a mean time of 9.89 days after the burst.