TITLE: GCN GRB OBSERVATION REPORT NUMBER: 455 SUBJECT: GRB 991208 - OVRO detection DATE: 99/12/12 05:09:41 GMT FROM: Shri Kulkarni at Caltech D. S. Shepherd, S. Jogee, S. R. Kulkarni and D. A. Frail on behalf of the Caltech-NRAO-Keck GRB effort report the detection of the radio afterglow of GRB 991208 at millimeter wavelengths. We undertook observations of the afterglow of GRB 991208 (Frail, GCN 451) with the Owens Valley Millimeter Array. The mean epoch of the observations is UT 1999 December 11.58. We detected a source with a flux of 3.8 +/- 0.8 mJy at position alpha(J)=16:33:53.5 and delta(J) = +46:27:21.2. This is coincident (within errors) with the radio afterglow of GRB 991208 first discovered at the VLA (GCN 451). This the brightest afterglow detected at millimeter wavelengths to date. We urge observations at higher frequencies.