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Spectroscopic classification of ASASSN-17je (=AT 2017ffq) as a Type II Supernova

ATel #10586; Osmar Rodriguez (UNAB/MAS), J. L. Prieto (UDP/MAS)
on 20 Jul 2017; 16:05 UT
Credential Certification: Jose L. Prieto (jose.prietok@mail.udp.cl)

Subjects: Optical, Supernovae, Transient

We obtained an optical spectrum (450-760nm) of ASASSN-17je/AT2017ffq (ATel #10571) on 2017 July 15.19 UT with GMOS, mounted on Gemini-South. Using the SNID code (Blondin & Tonry, 2007, ApJ, 666, 1024) we find a good match with a Type II supernova at z=0.014, consistent with the redshift of its host galaxy 2MASX J17401447-5825586. From the H-beta absorption minimum we estimate an expansion velocity of about 10000 km/s.