SIMBAD references

SNIFS spectra of supernovae 2006aa and 2006ac (cf. IAUC 8669) were taken on Feb. 10.5 and 10.6 UT, respectively. SN 2006aa is a type-IIn supernova at an approximate redshift (measured from its H-alpha emission peak) of z = 0.02, consistent with that of its host (NGC 3947, at z = 0.0207; from de Vaucouleurs et al. 1991, Third Reference Cat. of Bright Galaxies, ver. 3.9, via NED). SN 2006ac is a young type-Ia supernova, its spectrum similar to that of SN 1994D about nine days before maximum, at a redshift consistent with that of its host (NGC 4619, at z = 0.0231, de Vaucouleurs et al. 1991, via NED).