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Spectroscopic classification of PSN J18250198+2731537

ATel #4979; Shubham Srivastav, G. C. Anupama, D. K. Sahu, K. Kuppuswamy (Indian Institute of Astrophysics, Bangalore, India)
on 15 Apr 2013; 06:02 UT
Credential Certification: G.C. Anupama (gca@iiap.res.in)

Subjects: Optical, Supernovae

We obtained a low resolution spectrum (390-915 nm) of PSN J18250198+2731537 (CBAT TOCP) on Apr 12.9 UT with the HFOSC instrument on the Indian Astronomical Observatory's 2-m Himalayan Chandra Telescope. The spectrum exhibits hydrogen Balmer P Cygni lines, indicating that it is a Type II supernova. Using SNID (Blondin and Tonry 2007, Ap.J. 666, 1024), a best match is found with the type II-P supernova SN2004et with a phase of +12, at a redshift of 0.016 (consistent with redshift of host galaxy). Adopting a recession velocity of 4762 km/sec for the host galaxy (de Vaucouleurs et al. 1991, Third Reference Catalogue of Bright Galaxies, Version 3.9), the minimum of the P-Cygni absorption for H alpha indicates an expansion velocity of about 9300 km/sec.