Spectroscopic Classifications of Optical Transients with Keck I + LRIS

ATel #14892; K. W. Davis, M. R. Siebert, C. Rojas-Bravo, K. Taggart, S. Tinyanont, R. J. Foley (UCSC), C. R. Angus (DARK), J. D. R. Pierel (STScI)
on 4 Sep 2021; 16:14 UT
Distributed as an Instant Email Notice Supernovae
Credential Certification: Ryan Foley (foley@ucsc.edu)

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We report the following classifications from spectroscopic observations with the LRIS spectrograph on the Keck I telescope, made on 2021 Sep 4 UT. The targets were supplied by ALeRCE (as supplied by the ZTF data stream), ATLAS, and YSE. The classifications were performed with SNID (Blondin & Tonry, 2007, ApJ, 666, 1024).

 
Name          | IAU Name  | RA (J2000)   |  Dec (J2000) |   z     |  Type  | Phase  | Notes
 
ATLAS21bdio   | AT2021van | 01:24:29.551 | -19:51:44.33 | 0.0667  |  Ia    |  +30d  | 
ZTF21abqoivk  | AT2021vkz | 23:03:27.102 | +07:56:33.55 | 0.15    |  Ia    |  +30d  | 
PS21jfj       | AT2021wlr | 01:13:13.036 | +01:16:53.96 | 0.0449  |  II    |  peak  | (1) 
ZTF21abvrxau  | AT2021xbf | 20:48:00.594 | -00:10:42.44 | 0.0141  |  II    |  peak  | (2) 
PS21jrm       | AT2021xjh | 21:42:45.504 | +13:11:12.38 | 0.209   | Ia-91T |  -5d   | (3) 
ZTF21abvuwbp  | AT2021xre | 00:15:07.199 | +17:29:55.48 | 0.06    |  IIn   |        | (4) 

Notes: When the redshift is given to 2 decimal places, it is derived from the SN spectrum. Otherwise, the redshift is determined from the host galaxy. (1) We measure an H-alpha absorption velocity of -8,000 km/s. (2) We measure an H-alpha absorption velocity of -13,300 km/s. (3) We measure a Si II 6355 velocity of -11,000 km/s. (4) We measure an H-alpha FWHM of 600 km/s.