The U, B, V, and R light curves exhibit the typical forms of a Type I SN and suggest that the maximum occurred on JD2444672 when the SN was at Bmax = 12.00. The color indices (B-V) and (U-B) vary in systematic fashion with time and follow closely the mean evolution found from previous Type I SN by Pskovskii (1967, 1970, 1977). Assuming that the absolute magnitude of SN 1981b is M0max = -18.5, based on previous Type I SN on the zero point of the de Vaucouleurs distance scale, then the distance modulus of NGC 4536 is 30.29; this is in excellent agreement with the mean modulus, 30.1 + or - 0.3, derived from eight tertiary and quaternary indicators on the same zero point. Both of these values are about 1.5 m lower than the distance modulus that would be derived from the redshift of the galaxy, even on the same zero point.
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Buta et al. (1983) studied this question.