2009CBET.1851....1S

T. N. Steele, B. Cenko, and A. V. Filippenko, University of California, Berkeley, report that inspection of a CCD spectrum (range 340-1020 nm), obtained on June 16 UT with the 3-m Shane reflector (+ Kast) at Lick Observatory, shows that 2009ga (CBET 1839) is a young type-II supernova, probably within 1-2 weeks after explosion. The emission component of the H-alpha line greatly dominates over the absorption component. After removal of the host-galaxy recession velocity of 3500 km/s (from NED; Chengalur et al. 1993, Ap.J. 419, 30), the absorption minimum of the H-alpha line is blueshifted by 9300 km/s. Cross-correlation with a library of supernova spectra using the "SuperNova IDentification" code (SNID; Blondin and Tonry 2007, Ap.J. 666, 1024) indicates that the spectrum of 2009ga is most similar to that of the type-IIP supernova 2004et at one day past maximum brightness.