BL Lac outburst The blazar BL Lac has brightened as indicated by the following observations. YYYYMMDD(UT) mag observer 20000904.869 151 (M. Verdenet) 20000904.878 <143 (E. Muyllaert) 20000905.287 <144 (M. Simonsen) 20000905.860 152 (M. Verdenet) 20000906.217 <144 (M. Simonsen) 20000906.769 149 (T. Kinnunen) 20000906.874 <143 (E. Muyllaert) 20000906.941 146: (P. A. Dubovsky) 20000907.819 151 (T. Kinnunen) 20000909.099 151 (M. Verdenet) 20000909.800 148 (T. Kinnunen) 20000909.930 150 (T. Kinnunen) 20000910.099 152 (M. Verdenet) 20000910.540 143 (H. Itoh) 20000910.780 149 (T. Kinnunen) 20000910.878 144: (E. Muyllaert) 20000910.931 145 (C. P. Jones) 20000911.099 156 (M. Verdenet) 20000911.800 145 (T. Kinnunen)