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Asiago spectroscopic classification of PSN J13100734+3410514 as supernova impostor

ATel #5737; L. Tartaglia, A. Pastorello, S. Benetti, E. Cappellaro, L. Tomasella, P. Ochner, N. Elias-Rosa and M. Turatto (Osservatorio Astronomico di Padova, Istituto Nazionale di Astrofisica)
on 8 Jan 2014; 07:54 UT
Distributed as an Instant Email Notice Supernovae
Credential Certification: Lina Tomasella (lina.tomasella@oapd.inaf.it)

Subjects: Optical, Supernovae

We report that an optical spectrogram (range 340-820 nm; resolution 1.3 nm) of PSN J13100734+3410514 obtained on Jan. 08.20 UT with the Asiago 1.82-m Copernico Telescope (+ AFOSC), shows it to be a supernova impostor, very likely an eruption of a luminous blue variable. Adopting a redshift z = 0.0027 for the host galaxy UGC 8246 (Springob et al. 2005, ApJS, 160, 149), a good match is found with the prototypical SN impostor 1997bs (Van Dyk et al. 2000, PASP, 112, 1532). A prominent, narrow Halpha is visible at the redshift of the host galaxy, showing a composite emission profile. A narrower unresolved component is superimposed on broader (FWHM of about 1800 km/s) wings. The Asiago classification spectra are posted at the website URL http://sngroup.oapd.inaf.it. The classification is made with the GELATO tool (Harutyunyan et al. 2008, A.Ap. 488, 383) and SNID (Blondin and Tonry 2007, Ap.J. 666, 1024).