BL Lac active (cont'd) YYMMDD(UT) mag observer 980909.160 150 (G. Hanson) 980909.890 144 (M. Verdenet) 980912.669 142 (S. Takahashi) 980913.249 150 (G. Hanson) 980913.569 145 (H. Itoh) 980913.790 145 (T. Kinnunen) 980914.146 141 (G. Hanson) 980914.522 141 (H. Itoh) 980915.203 144 (G. Hanson) 980916.014 144 (G. Poyner) 980916.603 144 (H. Itoh) 980916.624 <142 (T. Watanabe) 980917.151 145 (G. Hanson)