TITLE: GCN GRB OBSERVATION REPORT NUMBER: 4290 SUBJECT: GRB 051117b: NIR observations DATE: 05/11/18 06:55:34 GMT FROM: Edo Berger at Carnegie Obs E. Berger (Carnegie Observatories) and A. Scholz (U. of Toronto) report: "We observed the position of GRB 051117b (GCN 4281) with WIRC on the du Pont 100-inch telescope at Las Campanas Observatory starting on 2005 Nov 18.10 UT. A total of 30 min were obtained in the Ks band. No sources are detected within the XRT error circle (GCN 4282) to a 3-sigma limit of Ks>19.3 mag in comparison to two nearby 2MASS stars. A single extended source, which is also visible in the DSS, is detected about 0.8" from the eastern edge of the error circle with Ks=17.9 mag."