TITLE: GCN GRB OBSERVATION REPORT NUMBER: 487 SUBJECT: Lowell/Perkins observation of GRB 991216 DATE: 99/12/18 07:24:25 GMT FROM: John Mattox at Boston U Using the KPNO GRB follow-up team's photometry (GCN #486) for Henden's star H (GCN #473), and stars A & B of Jha et al. (GCN #476), the GRB 991216 data obtained so far with the 1.8m Perkins Telescope at Lowell Observatory provides the following Rc band measurements. December (UT) Exposure Seeing R 17.156 200s 3.0" 18.8 +/- 0.1 18.191 600s 1.7" 21.1 +/- 0.2