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Spectroscopic classification of a supernova at Asiago

ATel #4438; L. Tomasella, S. Benetti, E. Cappellaro, P. Ochner, A. Pastorello, M. Turatto, S. Valenti, M. Fiaschi (Osservatorio Astronomico di Padova, Istituto Nazionale di Astrofisica)
on 29 Sep 2012; 20:35 UT
Distributed as an Instant Email Notice Supernovae
Credential Certification: Stefano Benetti (stefano.benetti@oapd.inaf.it)

Subjects: Optical, Supernovae, Transient

We report that a low signal-to-noise spectrogram of the Catalina Sky Survey transient CSS120926:174312+364602 (see http://www.lpl.arizona.edu/css/ ) on Sept. 28.81 UT with the Asiago 1.82-m Copernico Telescope (+ AFOSC; range 360-820 nm; resolution 1.9nm), suggests that this is a peculiar type-Ia supernova. Adopting a redshift of about 0.05, cross-correlation with a library of supernova spectra via the "Supernova Identification" code (SNID; Blondin and  Tonry 2007, Ap.J. 666, 1024), and best fits with the GELATO software tool (Harutyuyan et al. 2008, A.Ap. 488, 383) using a library of supernovae spectra show that the transient is most similar to several peculiar type Ia supernovae (1991T-like) about fifteen days after maximum.