Spectroscopic classification of transients with the Lick Shane telescope

ATel #14771; K. Davis, D. O. Jones, R. J. Foley, S. Tinyanont (UCSC)
on 10 Jul 2021; 05:41 UT
Distributed as an Instant Email Notice Supernovae
Credential Certification: David Jones (david.jones@ucsc.edu)

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We report the classifications of AT 2021rkk, 2021sbu, 2021smq, and 2021ssu from spectroscopic observations with the KAST spectrograph on the Shane telescope obtained on 2021 July 9 UT. AT 2021rkk and 2021sbu were supplied by ZTF and reported by ANTARES and ALeRCE, respectively. AT 2021smq was discovered by PSST (ATel #7153) and AT 2021ssu was discovered by ATLAS (ATel #8680). The classifications were performed with SNID (Blondin & Tonry, 2007, ApJ, 666, 1024).

 
Name         | IAU Name  | RA (J2000)   | Dec (J2000)  |   z    | Type | Phase | Notes
 
ATLAS21barw  | AT2021ssu | 01:19:51.554 | +10:33:20.31 | 0.034  | Ib/c | max   | (1) 
PS21hmt      | AT2021smq | 23:40:11.070 | -22:23:55.22 | 0.044  | Ia   | +5 d  | (2) 
ZTF21abimejj | AT2021rkk | 19:49:58.281 | +55:55:37.16 | 0.084  | Ia   | -1 d  | (3) 
ZTF21abjbrrj | AT2021sbu | 13:42:59.579 | +45:24:33.78 | 0.0327 | Ia   | -3 d  | (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 find adequate matches to SNe Ib/c near peak, but there are also some reasonable matches to SNe Ia. (2) We measure a Si II velocity of -11,000 km/s. (3) We measure a Si II velocity of -11,000 km/s. (4) We measure a Si II velocity of -11,000 km/s.