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Spectroscopic classification of MASTER OT J120451.50+265946.6

ATel #6639; Shubham Srivastav, D. K. Sahu, G. C. Anupama (Indian Institute of Astrophysics, Bangalore, India)
on 29 Oct 2014; 07:51 UT
Credential Certification: G.C. Anupama (gca@iiap.res.in)

Subjects: Optical, Supernovae

Referred to by ATel #: 6640, 6641, 6712, 6719, 6755, 7351

We report the spectroscopic classification of the MASTER OT J120451.50+265946.6 (ATeL #6634) as a type Ib supernova, based on a low resolution spectrum (350-920 nm) obtained on Oct 29.0 UT with the HFOSC instrument on the Indian Astronomical Observatory's 2-m Himalayan Chandra Telescope. The spectrum exhibits well-developed features of He I, Fe II and Ca II. Using SNID (Blondin and Tonry 2007, Ap.J. 666, 1024), a best match is found with several normal type-Ib supernovae a few weeks after maximum. The expansion velocity deduced from the He I 5876 absorption feature is ~8300 km/sec.