TITLE: GCN CIRCULAR NUMBER: 13911 SUBJECT: GRB 121027A: nIR afterglow candidate with AAT DATE: 12/10/27 20:11:13 GMT FROM: Rhaana Starling at U of Leicester R.L.C. Starling (U. Leicester), A.J. Levan (U. Warwick), K. Wiersema (U. Leicester), A.R. Lopez-Sanchez (AAO/Macquarie +University), N.R. Tanvir (U. Leicester), T. Young (ANU), L. Spitler (Macquarie University/AAO) and S. Lee (AAO) report: We triggered near-infrared observations with IRIS2 on the Anglo-Australian Telescope for GRB 121027A, beginning ~3.5 hours +after the Swift BAT trigger (Evans et al. GCN Circ. 13907). The field was observed for 2x10 minutes in each of J, H and K bands. In a preliminary analysis of the K band data (beginning +13:49 UT) we clearly detect a source within the enhanced XRT error circle (www.swift.ac.uk/sper/536831) at position: RA 04 14 23.44 Dec -58 49 47.4 (J2000) with approximate magnitude K(AB)=21.10 +/- 0.13. The source is not discernable from the J and H band images. These, however, do not go as deep owing to variable weather +conditions; the limiting magnitude in H(AB) is 21.3 (3-sigma, beginning 13:22 UT). These data were obtained under programme AAT/12B/30. [GCN OPS NOTE(28oct12): Per author's request, ALG was changed to ARL-S in the author list.]