Spectroscopic Classification of Astrophysical Transients with KCWI on the Keck II Telescope
ATel #18058; R. Kaur, K. C. Patra, R. J. Foley (UCSC)
on 19 Sep 2026; 01:56 UT
Distributed as an Instant Email Notice Supernovae
Credential Certification: Ravjit Kaur (ravkaur@ucsc.edu)
Subjects: Optical, Supernovae
We report the classifications of astrophysical transients from spectroscopic observations with the Keck Cosmic Web Imager (KCWI) on the Keck II telescope obtained on 2026 September 16 UT. The targets were supplied by GOTO, YSE, and ZTF. Targets were identified using the target management platform YSE-PZ (Coulter et al., 2023, PASP, 135, 4501). The classifications were performed with SNID (Blondin & Tonry, 2007, ApJ, 666, 1024) and SNID-SAGE (Toppa & Smartt, 2026, MNRAS, 549, 4).
Name | IAU Name | RA (J2000) | Dec (J2000) | z | Type | Phase | Notes
GOTO26fol | AT2026oou | 01:10:47.61 | -16:55:35.36 | 0.0427 | II | +90d |
PS26hgm | AT2026ynu | 02:19:07.28 | -14:44:35.85 | 0.0571 | II | +40d |
ZTF26abneopl | AT2026yop | 00:00:35.459 | -14:18:18.05 | 0.067 | Ib | +40d | (1)
PS26hpi | AT2026abof | 22:59:01.775 | +19:09:06.52 | 0.35 | SLSN | -5d |
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) The top SNID match is with a SN Ibn. We do not confidently detect narrow (~1000 km/s) He lines, but note that its blue continuum shape is consistent with that of SNe Ibn.
