TITLE: GCN CIRCULAR NUMBER: 13212 SUBJECT: GRB 120403B: AAT nIR observations DATE: 12/04/04 14:53:57 GMT FROM: Rhaana Starling at U of Leicester Rhaana Starling, Klaas Wiersema (U. Leicester), Stuart Ryder (AAO), Peter Barnes (U. Florida) and Christopher Stockdale (Marquette Univ.) report: We began observations of the field of GRB 120403B with IRIS2 on the 4m Anglo-Australian Telescope on 2012-04-04 at 08:34:00 UT, 12 hours after the BAT trigger (D'Elia et al., GCN Circ. 13203). We performed near-infrared photometry in the Ks, H and J bands, totalling 2x9 minutes in each filter. We do not detect any source within the UVOT-enhanced XRT error circle (Goad et al., GCN Circ. 13205) down to limiting magnitudes of Ks > 19.4 mag H > 20.0 mag J > 20.9 mag. Calibration was carried out using 8 2MASS field stars. No correction for Galactic extinction has been applied. These observations were obtained under programme AAT/11B/21.