2004IAUC.8338....2M

T. Matheson, P. Challis, and R. Kirshner, Harvard-Smithsonian Center for Astrophysics, report that a spectrum (range 340-720 nm) of SN 2004bn (cf. IAUC 8335), obtained by P. Berlind on May 11.18 UT with the F. L. Whipple Observatory 1.5-m telescope (+ FAST spectrograph), shows it to be a type-II supernova; adopting the NASA/IPAC Extragalactic Database recession velocity of 6533 km/s for the host galaxy, the expansion velocity, derived from the minimum of the H_beta line, is 5400 km/s. A spectrum of SN 2004bo (ibid.), obtained by Berlind on May 11.23, shows it to be a type-Ia supernova a few weeks past maximum.