Comment on SN.... : SN 1999as is the most luminous supernova ever discovered, with peak magnitude M_V<=-21.5. Hypernova with 4 * Msun Ni56 ejected? See Deng et al., 2001, ASPC, 251, 238. http://adsabs.harvard.edu/full/2001ASPC..251..238D. Also See IAU Circ.7128, 1999.
Comment on Gal... : Host 1999as
Host Galaxy information (for SNe discovered since January 2015):