Spectroscopic Classification of Astrophysical Transients with the Lick Shane Telescope
ATel #17541; K. W. Davis, R. J. Foley (UCSC)
on 14 Dec 2025; 01:32 UT
Distributed as an Instant Email Notice Supernovae
Credential Certification: Ryan Foley (foley@ucsc.edu)
Subjects: Optical, Supernovae
We report the classifications of astrophysical transients from spectroscopic observations with the Kast spectrograph on the Shane telescope obtained on 2025 December 13 UT. The targets were supplied by ATLAS, ZTF, and YSE. 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).
Name | IAU Name | RA (J2000) | Dec (J2000) | z | Type | Phase | Notes
ATLAS25ojl | AT2025advv | 06:08:30.769 | -24:38:53.50 | 0.0487 | SN II | +8d | (1)
ZTF25aceglik | AT2025aeqz | 10:33:27.161 | +56:04:27.01 | 0.090480 | SN Ia | +6d | (2)
ZTF25acerwiy | AT2025aevs | 23:57:38.099 | -21:43:08.59 | 0.0995 | SN Ia | +5d | (3)
PS25imv | AT2025affy | 06:14:05.587 | -21:12:58.31 | 0.071926 | SN Ia | -5d | (4)
ATLAS25pmo | AT2025agki | 07:33:20.605 | +47:27:13.45 | 0.0517 | SN Ia | -3d | (5)
ATLAS25pms | AT2025agkk | 07:57:30.589 | +39:35:26.26 | 0.09 | SN Ia-91T | -8d |
ZTF25acgzyyt | AT2025agnp | 07:48:04.265 | +03:43:26.70 | 0.0357 | SN Ia | -6d | (6)
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 a H-alpha absorption velocity of -12,700 km/s.
(2) We measure a Si II absorption velocity of -11,100 km/s.
(3) We measure a Si II absorption velocity of -11,200 km/s.
(4) We measure a Si II absorption velocity of -12,300 km/s.
(5) We measure a Si II absorption velocity of -11,400 km/s.
(6) We measure a Si II absorption velocity of -14,350 km/s.
