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ATEL # 2064; J. M. Silverman, S. B. Cenko, and A. V. Filippenko (UC Berkeley)
on 29 May 2009; 9:13 UT
Distributed as an Instant Email Notice (Supernova)
Password Certification: Alexei V. Filippenko (firstname.lastname@example.org)
Subjects: Optical, Nova, Supernova, Transients
Inspection of CCD spectra (range 340-1000 nm), obtained on May 28 UT with the 3-m Shane reflector (+ Kast) at Lick Observatory, reveals that CSS090523:142406+074610 (ATel #2057) is a normal type Ia supernova. Cross-correlation with a library of supernova spectra using the "SuperNova IDentification" code (SNID; Blondin and Tonry 2007, ApJ, 666, 1024) indicates that it is about one week past maximum brightness and most similar to the normal type Ia SN 1992A at 6 days past maximum. A relatively noisy spectrum of CSS090514:150635+215115 (ATel #2057) reveals that it might be a type II supernova shortly after explosion, but further observations are needed to verify this.