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Spectroscopic Classification of MASTER OT J110707.62-052244.0 as a Type Ia Supernova

ATel #8284; W. Zheng, M. Kim, I. Shivvers, H. Yuk, A. V. Filippenko (UC Berkeley)
on 15 Nov 2015; 08:00 UT
Credential Certification: Weikang Zheng (zwk@umich.edu)

Subjects: Optical, Supernovae

We report that inspection of a CCD spectrum (range 350-1050 nm) of MASTER OT J110707.62-052244.0 (ATel #8236), obtained on Nov. 11.57 UT with the Shane 3-m reflector (+ Kast spectrograph) at Lick Observatory, shows that the object is a normal Type Ia supernova roughly 1 week past maximum brightness. Cross-correlation with a library of supernova spectra using the "SuperNova Identification" code (SNID; Blondin & Tonry 2007, Ap.J. 666, 1024) indicates a similarity with several normal Type Ia supernovae about 8 days after maximum light. The redshift derived from SNID is 0.037, consistent with the host-galaxy (PGC 1045517) redshift given in NED (z = 0.037). Adopting this redshift, the rest-frame photospheric velocity estimated from the minimum of the Si II 635.5-nm absorption feature is 11,300 ± 200 km/s.