SN1999by around maximum YYMMDD(UT) mag observer 990418.208 <200C (S. Moore) 990425.199 <193C (KAIT (from IAUC)) 990428.878 163:C (R. Arbour (from IAUC)) 990430.199 159C (KAIT (from IAUC)) 990430.826 155 (E. Berko) 990430.874 151C (R. Arbour (from IAUC)) 990501.100 153C (KAIT (from IAUC)) 990501.885 145 (M. Armstrong (from IAUC)) 990502.044 142 (M. Moilanen) 990502.200 14.38I (KAIT (from IAUC)) 990502.200 14.52R (KAIT (from IAUC)) 990502.200 14.63V (KAIT (from IAUC)) 990502.200 14.97B (KAIT (from IAUC)) 990502.200 148C (KAIT (from IAUC)) 990502.549 14.23C (Y. Sano) 990502.872 14.31I (D. Hanzl) 990502.872 14.42V (D. Hanzl) 990502.872 14.69B (D. Hanzl) 990503.822 138 (M. Lehky) 990503.849 136 (K. Hornoch) 990503.875 140 (J. Ripero) 990503.887 143 (R. J. Bouma) 990503.887 143 (G. Comello) 990503.916 14.15C (D. Rodriguez) 990503.950 14.08C (D. Buczynski) 990503.958 143 (O. Midtskogen) 990503.981 145C (O. Trondal) 990504.005 <138 (B. H. Granslo) 990504.067 14.00V (D. Hanzl) 990504.137 144 (B. King) 990504.207 140 (R. J. Modic) 990504.860 135 (T. Kinnunen) 990504.873 138C (Ph. Dupouy) 990504.956 141 (B. H. Granslo) 990505.203 136 (R. J. Modic) 990505.480 143: (M. Sato) 990505.869 137 (T. Kinnunen) 990505.887 136C (Ph. Dupouy) 990505.900 134C (T. Fredriksen) 990505.974 137 (B. H. Granslo) 990505.978 135C (M. Moilanen) 990505.980 140 (J. Warell) 990505.989 141 (J. Ripero) 990506.472 135 (M. Sato) 990506.476 138C (S. Yoshida) 990506.503 13.30C (Y. Sano) 990506.503 137 (N. Makiguchi) 990506.503 139 (T. Watanabe) 990506.622 <126 (H. Maehara) 990506.829 134C (K. Zsolt) 990506.872 137 (E. Muyllaert) 990506.928 134C (A. Moisson) 990506.962 137 (H. McGee) 990506.978 135 (B. H. Granslo) 990506.987 13.56V (A. Moisson) 990507.292 134 (R. J. Modic) 990507.440 138C (S. Yoshida) 990507.478 137 (S. Takahashi) 990507.576 133 (M. Funada) 990507.601 <126 (H. Maehara) 990507.603 139 (T. Watanabe) 990507.864 137 (J. Ripero) 990507.869 134 (T. Kinnunen) 990507.875 13.40V (D. Rodriguez) 990507.938 134 (B. H. Granslo) 990508.483 133 (M. Sato) 990508.507 137 (N. Makiguchi) 990508.640 133C (S. Yoshida) 990508.876 134 (E. Muyllaert) 990508.880 131C (Ph. Dupouy) 990508.894 131 (J. Ripero) 990508.926 133 (J. Carvajal) 990508.944 132C (J. Lafont) 990509.750 136 (V. Tuboly) 990509.882 133 (E. Muyllaert) 990509.889 131C (Ph. Dupouy) 990509.900 133 (G. Comello) 990509.922 132 (R. J. Bouma) 990510.290 132 (R. J. Modic) 990510.467 12.96C (Y. Sano) 990510.807 132C (K. Zsolt) 990510.869 133 (G. Comello) 990510.885 132 (E. Muyllaert) 990510.894 133 (J. Ripero) 990510.901 131 (R. J. Bouma) 990510.907 130C (Ph. Dupouy) 990510.940 137 (D. Gill) 990510.947 132 (H. McGee) 990510.985 131C (M. Moilanen) 990511.044 139 (M. Suarez) 990511.890 134 (T. Kinnunen) 990511.892 131 (J. Ripero)