Classification certificate for object 2018gl
TNS Classification Report No. 1641 [ 2018TNSCR..74....1D ]

Date Received (UTC): 2018-01-16 02:08:56
Sender: Matthew Siebert
Group: None

G. Dimitriadis, M. R. Siebert, R. J. Foley (UCSC) report/s a classification of object: SN 2018gl

Type: SN Ia
Redshift: 0.018

Remarks: Similar to SN 1986G and other "transitional" SNe Ia. We measure an Si II 6355 velocity of -11,500 km/s. We detect a subtle absorption feature at ~6350 A, which may be caused by C II 6580 at -10,600 km/s. The cool photosphere and possible carbon detection are both notable features of the peculiar SN 2006bt (Foley et al., 2010, ApJ, 708, 1748).

The following Classification spectrum was provided:

Obsdate: 2018-01-15 09:46:04
Instrument: LRIS
Telescope: Keck I 10m

Details of the object and its spectra can be viewed here: