2004IAUC.8331....1G

C. L. Gerardy, University of Texas at Austin; and R. A. Fesen, Dartmouth College, report that a low-resolution optical spectrogram (resolution 600; range 565-950 nm) of SN 2004bk (IAUC 8329), obtained on Apr. 24.28 UT with the 2.4-m Hiltner Telescope (+ ModSpec spectrograph) at MDM Observatory, shows it to be a type-Ia supernova near maximum light; adopting the 6906 km/s redshift of NGC 5246 from the NASA/IPAC Extragalactic Database (NED), the expansion velocity of the Si II feature (rest wavelength 635.5 nm) is 11800 km/s. A similar spectrogram of SN 2004bh (IAUC 8320), obtained on Apr. 24.21, shows it to be a type-II supernova, likely at early epoch. The spectrum exhibits a single broad H_alpha emission feature with little or no blueshifted absorption component. Adopting the redshift of UGC 5161 (10079 km/s) from the NED, the expansion velocity of the blue edge of the H_alpha feature is about 6850 km/s. No other emission or absorption features are seen in the spectrum.