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Optical Spectroscopy of iPTF13bvn

ATel #5142; D. Milisavljevic (Harvard-Smithsonian Center for Astrophysics, (CfA)), R. Fesen (Dartmouth College), T. Pickering, B. Miszalski (South African Astronomical Observatory (SAAO) and the Southern African Large Telescope (SALT)), D. Buckley (SALT), J. Parrent (Dartmouth College and Las Cumbres Observatory), G. H. Marion, J. Silverman, J. Vinko, C. Wheeler (UT Austin), R. Quimby (Kavli IPMU), S. W. Jha (Rutgers), S. Mohamed (SAAO), M. M. Kasliwal (OCIW & Princeton), and A. Soderberg (CfA)
on 18 Jun 2013; 02:15 UT
Distributed as an Instant Email Notice Supernovae
Credential Certification: D. Milisavljevic (dmilisav@cfa.harvard.edu)

Subjects: Optical, Supernovae

Referred to by ATel #: 5146, 5151, 5152

Low-dispersion spectra (range 320-900 nm) obtained on June 17.8 UT with the 10-m SALT telescope (+ RSS) of iPTF13bvn (ATel #5137) show it to be a young Type I supernova. Comparison with spectra retrieved from the Supernova Spectrum Archive (SUSPECT; cf. website URL http://bruford.nhn.ou.edu/~suspect/index.html ) shows reasonable matches with Type Ib events SN 2005bf at 32 days before maximum light (Folatelli et al. 2006, ApJ, 641, 1039) and SN 1999dn at 10 days before maximum light (Deng et al. 2000, ApJ, 540, 452). Fitting with the SYN++ software (Thomas et al. 2011, PASP 123, 237) suggests that broad absorption features seen in the spectra are associated with Fe II, Ca II, and He I with velocities between 16000-18000 km/s (assuming a redshift of z = 0.00449 for the host galaxy NGC 5806). Additional observations are encouraged to confirm this classification.