SALT spectroscopic classification of SN 2016gkg as a young type-II supernova
ATel #9528; S. W. Jha (Rutgers), V. van Wyk, P. Vaisanen (SALT/SAAO)
on 21 Sep 2016; 23:07 UT
Distributed as an Instant Email Notice Supernovae
Credential Certification: Saurabh Jha (saurabh@physics.rutgers.edu)
Subjects: Optical, Supernovae
On 2016 Sep 21.9 UT we obtained SALT (+RSS) spectroscopy of SN
2016gkg, the object
reported by Victor Buso and Sebastian Otero, and confirmed by
ASAS-SN (ATel #9521) and ATLAS (ATel #9526). The spectrum covers the
wavelength range 360-935 nm and shows a blue continuum with weak,
broad P-Cygni features of H-alpha and H-beta, indicating a young
type-II supernova. Adopting a host galaxy redshift of 1481 km/s for
NGC 613 (Koribalski et al. 2004, AJ, 128, 16; via NED) yields an
expansion velocity for the supernova of 17,000 km/s measured to the
"trough" of the H-alpha line. Narrow interstellar Na I D absorption is
visible both from the Milky Way (equivalent width approximately 0.1
Angstrom for D1+D2) and from the host (equivalent width approximately
0.7 Angstrom, D1+D2).
Our spectrum is posted on the Transient Name
Server SN 2016gkg page.
