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Asiago spectroscopic observation of PSN J09132750+7627410

ATel #7051; L. Tartaglia, A. Pastorello, S. Benetti, E. Cappellaro, N. Elias-Rosa, P. Ochner, G. Terreran, L. Tomasella, M. Turatto (INAF Osservatorio Astronomico di Padova)
on 12 Feb 2015; 07:17 UT
Credential Certification: Lina Tomasella (lina.tomasella@oapd.inaf.it)

Subjects: Optical, Supernovae

Referred to by ATel #: 7172

The Asiago Transient Classification Program (Tomasella et al. 2014, AN, 335, 841) reports the spectroscopic observation of PSN J09132750+7627410 in NGC 2748. The observation was performed with the Asiago 1.82m Copernico Telescope (+AFOSC; range 340-820 nm; resolution 1.4 nm), equipped with the CCD Andor IKON L936.

Name                  | Date (UT)   |   z   | Type | Phase  | Notes 
PSN J09132750+7627410 | 20150211.98 | 0.005 | LBV  | at max | (1)  

(1) Very blue continuum with superimposed narrow emission lines, which are marginally resolved in our spectrum. We measure an apparent magnitude V=18.7. Adopting for the host galaxy NGC 2748 a Tully-Fisher distance of 20.9 Mpc (Springob et al. 2009, ApJS 182, 474, via NED), we obtain for the transient an absolute magnitude of -13. Although the spectral appearance may also be consistent with that of an early core-collapse SN, the very faint absolute magnitude suggests that PSN J09132750+7627410 is a SN impostor, very likely a major outburst of an LBV. The host galaxy redshift is obtained from Kamphuis, J. J.; Sijbring, D.; van Albada, T. S. 1996, A&AS, 116, 15 (via NED).

Classification was made via GELATO (Harutyunyan et al. 2008, A.Ap. 488, 383) and SNID (Blondin and Tonry 2007, Ap.J. 666, 1024). The Asiago classification spectra are posted at this website: URL http://sngroup.oapd.inaf.it