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Asiago spectroscopic classification of SN 2017ati.

ATel #10136; S. Benetti, L. Tomasella, E. Cappellaro, N. Elias-Rosa, P. Ochner, A. Pastorello, M. Turatto (INAF Osservatorio Astronomico di Padova), G. Terreran (INAF-OAPd, QUB)
on 27 Feb 2017; 23:11 UT
Distributed as an Instant Email Notice Supernovae
Credential Certification: Stefano Benetti (stefano.benetti@oapd.inaf.it)

Subjects: Optical, Supernovae

The Asiago Transient Classification Program (Tomasella et al. 2014, AN, 335, 841) reports the spectroscopic observation of Gaia17aiq. The target was supplied by Gaia Photometric Science Alerts programme .

The observation was performed with the Asiago 1.82m Copernico Telescope (+AFOSC; range 340-820 nm; resolution 1.4 nm).

Survey name | IAU name  | Host galaxy | Disc. Date (UT) | Obs. Date (UT) | redshift | type |  phase  | notes 
Gaia17aiq  | SN2017ati |  PGC 28268  |  2017-02-06.43  | 2017-02-27.78  |  0.016   | IIb  | maximum |   1   

(1) Spectrum consistent with those of Type IIb supernovae close to maximum. If the above listed redshift is assumed (derived from the SN spectral features), an expansion velocity of about 10900 km/s is derived from the H-alpha absorption.

The classification was performed using the GELATO (Harutyunyan et al. 2008, A&A, 488, 383)
and SNID (Blondin and Tonry 2007, ApJ, 666, 1024) tools.

The Asiago classification spectra are posted at the website http://sngroup.oapd.inaf.it.