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Spectroscopic classification of CSS161106:231233+092930 as a Type Ia supernova

ATel #9871; J. Vinko (Konkoly Obs; U Szeged; UT Austin), R. Quimby (SDSU), J. C. Wheeler (UT Austin)
on 17 Dec 2016; 20:21 UT
Credential Certification: Jozsef Vinko (vinko@astro.as.utexas.edu)

Subjects: Optical, Supernovae

We report spectroscopic observation of CSS161106:231233+092930, a transient discovered by the Catalina Real-Time Transient Survey (Drake et al. 2009, ApJ 696, 870) on 2016-11-06.

A spectrum (range 3700-9300 Angstroms), taken with the new "Low Resolution Spectrograph-2" (LRS2) on the 10m Hobby-Eberly Telescope at McDonald Observatory by Matthew Shetrone on 2016-12-15.09 UT, is similar to that of a Type Ia supernova at about a month after maximum light, consistent with the discovery date.

A comparison with supernova templates using the "SuperNova IDentification" code (SNID; Blondin & Tonry, 2007, ApJ 666, 1024) resulted in a good match with many Type Ia template spectra aged between 27 and 40 days after maximum, with a median age being 30 +/- 7 days. The redshift estimated by SNID from the SN features is z = 0.051 +/- 0.003.