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Optical Spectroscopy of CSS080924:040630+145214

ATEL # 1801; J. M. Silverman, B. E. Cobb, M. McCourt, and A. V. Filippenko
on 22 Oct 2008; 17:43 UT
Password Certification: Alexei V. Filippenko (

Subjects: Optical, Nova, Supernova, Transients

We report on observations of the CSS transient CSS080924:040630+145214 first announced by Mahabal et al. (ATEL #1778). We obtained an optical spectrum (range 3450-6400 Angstroms) on October 22.42 UT using the Kast spectrograph on the Lick 3-m telescope. The spectrum shows that the transient is a type-Ia supernova, about a month past maximum brightness. Cross-correlation with a library of supernova spectra using the "SuperNova IDentification" code (SNID; Blondin & Tonry 2007, Ap.J. 666, 1024) indicates that it is most similar to the type-Ia SN 1994M at 34 days past maximum.

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