BL Lac outburst BL Lac is reported to be undergoing a flare. Confirmatory observations are encouraged. YYMMDD(UT) mag observer 990827.928 146 (C. P. Jones) 990827.990 147 (G. Poyner) 990830.869 144 (M. Verdenet) 990830.869 148 (T. Kinnunen) 990830.927 143 (C. P. Jones) 990831.860 145 (M. Verdenet) 990901.840 147 (T. Kinnunen) 990901.890 145 (M. Verdenet) 990902.899 144 (M. Verdenet) 990903.860 147 (M. Verdenet) 990903.907 148 (C. P. Jones) 990904.651 149 (H. Itoh) 990904.869 148 (M. Verdenet) 990904.896 147 (C. P. Jones) 990905.830 152 (T. Kinnunen) 990906.849 150 (T. Kinnunen) 990907.869 149 (T. Kinnunen) 990907.903 142 (C. P. Jones) 990908.819 146 (T. Kinnunen) 990908.860 140 (M. Verdenet) 990909.830 146 (T. Kinnunen) 990909.849 143 (M. Verdenet) 990909.886 140 (C. P. Jones) 990909.971 148 (G. Poyner) 990910.819 146 (T. Kinnunen) 990911.840 144 (T. Kinnunen) 990912.849 144 (M. Verdenet) 990912.849 148 (T. Kinnunen) 990913.251 145 (G. Hanson) 990913.840 148 (T. Kinnunen) 990914.215 143 (G. Hanson) 990914.819 142 (T. Kinnunen) 990915.810 143 (T. Kinnunen) 990916.830 135V (D. Rodriguez)