TITLE: GCN GRB OBSERVATION REPORT NUMBER: 494 SUBJECT: K observations of GRB991216 DATE: 99/12/18 22:33:22 GMT FROM: Susan Kassin at Ohio State U. W. Keel (Univ. of ALabama, Tuscaloosa) observed the GRB 991216 transient using the ONIS system on the MDM 2.4m telescope. From observations at 0400-0430 UT on 18 December, the K magnitude was 16.3 from a preliminary reduction with respect to UKIRT faint standard 2, in accord with the ESO NTT observations. The K image shows no extension with respect to stellar images in 1.3" seeing. J and H data were also obtained but have not yet been fully reduced. This message can be cited.