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To: stefano@bicar.it
From: atel@astronomerstelegram.org
Subject: ATel  17318
Message-Id: <20250804070531.5A09228807EA@server.astronomerstelegram.org>
Date: Mon,  4 Aug 2025 03:05:31 -0400 (EDT)

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Posted: Within the last 24 hours
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ATEL #17318							     ATEL #17318

Title:	Spectroscopic Classification of Astrophysical Transients with
		the Lick Shane Telescope
Author:	K. W. Davis, R. J. Foley (UCSC)
Queries:	kywdavis@ucsc.edu
Posted:	3 Aug 2025; 15:04 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 August 3 UT. The targets were supplied by ATLAS, YSE, and ALeRCE
(selected from the ZTF data stream). 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 
PS25eqd	     | AT2025qmk  | 16:25:01.607 | +40:56:45.72 | 0.0287 | SN II
| +15d   | (1) 
ATLAS25hwg	 | AT2025rlk  | 00:11:41.362 | -22:59:09.70 | 0.0644 | SN Ia
| +12d   | (2) 
ZTF25abecbib | AT2025shi  | 22:48:42.279 | +27:34:57.99 | 0.0320 | SN IIn-pec
| rising | (3)

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 -8500 km/s. 
(2) We measure a Si II 6355 absorption velocity of -10,800 km/s. 
(3) We find several strong, narrow (FWHM ~1200 km/s) emission lines of
H and He superimposed atop a blue continuum.

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