Spectroscopy of CSS090523:142406+074610 and CSS090514:150635+215115
ATel #2064; J. M. Silverman, S. B. Cenko, and A. V. Filippenko (UC Berkeley)
on 29 May 2009; 09:13 UT
Distributed as an Instant Email Notice Supernovae
Credential Certification: Alexei V. Filippenko (alex@astro.berkeley.edu)
Subjects: Optical, Supernovae, Transient
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.
