Classification certificate for object 2017dwq
TNS Classification Report No. 999 [ 2017TNSCR.565....1K ]

Date Received (UTC): 2017-05-18 16:19:09
Sender: Dr. Morgan Fraser
Group: NUTS

E. Kankare (QUB) on behalf of NUTS report/s a classification of object: SN 2017dwq

Type: SN IIn
Redshift: 0.018

Remarks: Narrow H emission lines, broad P Cygni features of Hbeta and HeI/NaID, and narrow Na ID absorption are detected. The spectrum resembles that of SN 2009ip (Pastorello et al 2013, ApJ, 767, 1; Fraser et al. 2013, MNRAS, 433, 1312), although we cannot rule out some contamination from the host galaxy background. The EW of the Galactic Na ID component is 1.06, and that of the host 2.23. Scaling from the Galactic extinction (Schlafly & Finkbeiner 2011, ApJ, 737, 103) of A_R = 0.34 mag, suggests a total line-of-sight extinction of A_R ~ 1 mag. This yields an absolute magnitude of M ~ -18.5 mag for ASASSN-17fy.

The following Classification spectrum was provided:

Obsdate: 2017-05-17 21:36:00
Instrument: ALFOSC
Telescope: Nordic Optical Telescope

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