Classification certificate for object 2017isj
TNS Classification Report No. 1500 [ 2017TNSCR1369....1H ]

Date Received (UTC): 2017-12-04 19:36:57
Sender: Dr. Griffin Hosseinzadeh
Group: Global SN Project

Griffin Hosseinzadeh, Iair Arcavi, D. Andrew Howell, Curtis McCully, Stefano Valenti report/s a classification of object: SN 2017isj

Type: SN Ia
Redshift: 0.019

Remarks: Using Superfit (Howell et al. 2005, ApJ, 634, 1190), we find good fits to several Type Ia supernovae 0-2 weeks before maximum light at a redshift of the proposed host galaxy (z=0.019; Falco et al. 1999, PASP, 111, 438 via NED). We measure a Si II velocity of about 16,000 km/s, implying the supernova was discovered soon after explosion, but the absolute magnitude at discovery was about -19, implying it was discovered near maximum light. Together, these could either indicate a young overluminous supernova or a high-velocity supernova at peak.

The following Classification spectrum was provided:

Obsdate: 2017-12-04 12:50:31
Instrument: FLOYDS-N
Telescope: Faulkes Telescope North

Details of the object and its spectra can be viewed here: https://wis-tns.weizmann.ac.il/object/2017isj