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Spectroscopic classification of AT 2017byx as a Type Ia Supernova

ATel #10350; J. Vinko (Konkoly Obs., U Szeged, UT Austin), J. C. Wheeler (UT Austin), K. Sarneczky, R. Szakats (Konkoly Obs.), T. Szalai, P. Szekely (U Szeged) and the HETDEX collaboration
on 5 May 2017; 15:32 UT
Credential Certification: Jozsef Vinko (vinko@astro.as.utexas.edu)

Subjects: Optical, Supernovae

During the commissioning phase of the Hobby-Eberly Telescope Dark Energy Experiment (HETDEX) survey we observed AT 2017byx (ATLAS17bla, PS17bve) at R.A.=14:17:48.36 Dec.=+52:41:54.6 with the Visible Integral-field Replicable Unit Spectrograph (VIRUS) at McDonald Observatory on 2017-04-28.2 UT.

The spectrum (range between 3500 and 5500 Angstroms) indicates that AT 2017byx is a Type Ia supernova. The Supernova Identification (SNID) code (Blondin & Tonry 2007, ApJ, 666, 1024) gives good match with many Type Ia supernovae around z ~ 0.067 which agrees with the spectroscopic redshift of the presumed host galaxy (SDSS J141747.64+524143.2, z = 0.068). SNID estimates the age of the supernova as between 1 and 3 months after maximum light which is consistent with the date of discovery (2017-03-06).