2004IAUC.8304....4M

Further to IAUC 8303, T. Matheson, P. Challis, and R. Kirshner report that a spectrum of SN 2004an (cf. IAUC 8299), obtained by P. Berlind on Mar. 14.45 UT, shows it to be a type-II supernova. Adopting the NASA/IPAC Extragalactic Database recession velocity of 8979 km/s for the host galaxy, the expansion velocity derived from the minimum of the H_beta line is 8800 km/s. A spectrum of SN 2004ao (cf. IAUC 8299), obtained on Mar. 14.53, shows it to be a type-Ib supernova, similar to SN 1998dt at 8 days past maximum (see Matheson et al. 2001, A.J. 121, 1648). A spectrum of SN 2004at (cf. IAUC 8302), obtained on Mar. 15.53, shows it to be a type-II supernova.