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From: atel@astronomerstelegram.org
Subject: ATel  17210
Message-Id: <20250529070535.CC8D328807DC@server.astronomerstelegram.org>
Date: Thu, 29 May 2025 03:05:35 -0400 (EDT)

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ATEL #17210							     ATEL #17210

Title:	Spectroscopic Classifications of Optical Transients with the
		Lick Shane telescope
Author:	Kishore C. Patra (UCSC),  Ryan J. Foley (UCSC)
Queries:	kcpatra@ucsc.edu
Posted:	28 May 2025; 22:05 UT
Subjects:Optical, Supernovae, Transient

We report the following classifications of optical transients from spectroscopic
observations with the Kast spectrograph on the Shane telescope. The targets
were supplied by GOTO and YSE. Observations were made on 2025 May 28 UT.
Classifications were performed with SNID (Blondin & Tonry, 2007, ApJ, 666,
1024).

Name        	| IAU Name  	| RA (J2000)	| Dec (J2000)	|   z	| Type	| Phase	|
Notes 
GOTO25ddg	| AT 2025mbz 	| 14:07:30.452	| -00:47:23.25	| 0.034	|  Ia   |
-11 d	| (1) 
PS25cxw	        | AT 2025mbd	| 17:07:28.159	|+34:34:04.08	| 0.028	|  SN	|
+2 d 	| (2)

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 redshift was determined using narrow emission lines from the host
galaxy, including H I, [N II], [O III], [O II], [O I], and [S II]. For
the supernova, we measure Si II 6355 and Ca II near-infrared triplet absorption
velocities of -16,500 km/s and -28,000 km/s, respectively. Phase relative
to optical peak.  
(2) We observe a blue, featureless continuum. Phase is relative to discovery.

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