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Classification of Gaia17czt as a supernova

ATel #11008; M. Dennefeld (IAP-Paris and UPMC)
on 26 Nov 2017; 13:34 UT
Credential Certification: Michel Dennefeld (dennefel@iap.fr)

Subjects: Optical, Supernovae

M. Dennefeld (IAP-Paris and UPMC) reports observations of Gaia supernovae candidates with the SAAO 74" telescope equiped with the SpUpNIC spectrograph. Observations during the night of Nov.25 covered the range 3900-9300 A. and the spectral resolution was 5.8 A. Classifications were made with the help of GELATO (Harutyunyan et al. 2008, A&A, 488, 383) Gaia17czt (=AT2017ijr) is classified as a SN Ia around maximum, with an uncertainty of plus minus a few days. A broad line Ic cannot be excluded. The recession velocity of the SDSS host galaxy is measured at 11880 km/s from a single Halpha emission line. From there, the SiII 6355 velocity is then -10370 km/s.