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ATEL # 2575; J. M. Silverman, I. K. W. Kleiser, C. V. Griffith, and A. V. Filippenko (University of California, Berkeley)
on 19 Apr 2010; 16:36 UT
Password Certification: Alexei V. Filippenko (firstname.lastname@example.org)
Subjects: Optical, Nova, Supernova
We report that inspection of a low signal-to-noise ratio CCD spectrum (range 350-1000 nm) of CSS100409:154258+021653, obtained on Apr. 15 UT with the 3-m Shane reflector (+Kast) at Lick Observatory, shows that CSS100409:154258+021653 (ATEL #2555) is a normal type-Ia supernova. Cross-correlation with a library of supernova spectra using the "SuperNova IDentification" code (SNID; Blondin and Tonry 2007, Ap.J., 666, 1024) indicates that it is within a few days of maximum brightness and has a redshift of 0.039.