IAUC No. 6693 tells that BL Lac is undergoing a major outburst (J. C. Noble et al.) On June 23, the R-magnitude reached 12.50-12.75. Recent observations reported to VSNET show rather faint values, possibly suggesting a large fluctuation with a short time scale. YYMMDD(UT) mag observer 970511.103 153 (G. Poyner) 970512.069 153 (G. Poyner) 970514.047 153 (G. Poyner) 970526.044 151 (G. Poyner) 970530.053 152 (G. Poyner) 970531.042 152 (G. Poyner) 970602.026 153 (G. Poyner) 970608.023 153 (G. Poyner) 970705.016 153 (G. Poyner) Regards, Taichi Kato