Spectroscopic Classifications of Optical Transients with the Lick Shane telescope
ATel #17210; Kishore C. Patra (UCSC), Ryan J. Foley (UCSC)
on 28 May 2025; 22:05 UT
Distributed as an Instant Email Notice Supernovae
Credential Certification: Kishore Patra (kcpatra@ucsc.edu)
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.
