Fig. 4
Time evolution of the broad Hα luminosity for the I08 objects, as well as several luminous type IIn SNe (Kuncarayakti et al. 2016; Aretxaga et al. 1999; Stritzinger et al. 2012; Smith et al. 2008; Jencson et al. 2016) and the transient event SDSS1133 (Koss et al. 2014). The I08 objects are roughly constant over periods of 10−13 yr; there is some variability between epochs at the ~50% level, but this could be due to calibration uncertainties. All error bars are smaller than the symbols.
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