Compilation of SNe IIn with rapid rises, plateau-like maxima, and linear declines. Shown here are the sample SNe PTF11oxu and PTF11rfr (photometry binned in 3 day bins for clarity) along with SNe 1994Y (Ho et al. 2001) and 2005db (Kiewe et al. 2012). For comparison, the Type IIn-P SN 2009kn (Kankare et al. 2012) is shown. Dashed vertical lines highlight 50 d plateau duration. The bolometric decay rates (Nadyozhin 1994) for 0.5 and 2.0 M_⊙ of synthesised ⁵⁶Ni are shown as dashed blue lines (assuming a rise time to plateau start of 20 d) for comparison. They are not fits to the photometry. Model A01 (bolometric luminosity) by van Marle et al. (2010) is also shown.