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From: atel@astronomerstelegram.org
Subject: ATel  17541
Message-Id: <20251214070537.614BA28806A6@server.astronomerstelegram.org>
Date: Sun, 14 Dec 2025 02:05:37 -0500 (EST)

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ATEL #17541							     ATEL #17541

Title:	Spectroscopic Classification of Astrophysical Transients with
		the Lick Shane Telescope
Author:	K. W. Davis, R. J. Foley (UCSC)
Queries:	kywdavis@ucsc.edu
Posted:	14 Dec 2025; 01:32 UT
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.

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