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Spectroscopic classification of SN2017gvr as a peculiar type Ib SN

ATel #10779; Jorge Martinez (U. Chile), L. Galbany (U. Pitt), S. Gonzalez-Gaitan (U. Lisboa), F. Forster (U. Chile)
on 25 Sep 2017; 17:20 UT
Credential Certification: Lluis Galbany (lluisgalbany@gmail.com)

Subjects: Optical, Supernovae

We report the spectroscopic classification of SN2017gvr as a peculiar type Ib supernova discovered by the OGLE-IV Real-time Transient Search (Wyrzykowski et al., 2014 arxiv:1409.1095; http://ogle.astrouw.edu.pl/ ). SN2017gvr was discovered on 21 August 2017 at R.A. = 04:03:36.10, Decl = -69:37:45.9 with i = 20.85 mag. SN2017gvr has a non-detection five days before on 16 August 2017 (mag. limit ~22 in the I-band).

We obtained spectra using LDSS3 on the 6.5m Clay telescope at the Las Campanas Observatory on 22 September 2017. Object classification was performed using SNID (Blondin & Tonry 2007, ApJ, 666, 1024), and we find relatively good fits to several Type Ib supernovae around maximum light at a redshift z=0.109, which corresponds to an absolute I-band magnitude of -19.45. However, none of the fits is able to perfectly fit the shallow He I absorptions. In addition, this supernova has been rising for more than a month already, which makes the object luminous and long-lived.

Further follow-up observations are encouraged.