2005IAUC.8463....3M

Further to IAUC 8461, M. Modjaz, R. Kirshner, and P. Challis report that a spectrogram of SN 2004gy (cf. IAUC 8460), obtained at Mt. Hopkins by W. Brown on Jan. 10.49 UT, reveals it to be a type-II supernova, probably within a few weeks past explosion. The spectrum consists of a blue continuum and Balmer-line P-Cyg features, with an emission-dominated H_alpha component. The host- galaxy redshift, measured from narrow H_alpha emission lines in the nucleus, is 0.0269; adopting this redshift, the expansion velocity derived from the minimum of the H_beta line is about 10000 km/s.