Spectroscopic Classification of Astrophysical Transients with the Lick Shane Telescope

ATel #17408; R. Kaur, R. J. Foley (UCSC)
on 21 Sep 2025; 21:12 UT
Distributed as an Instant Email Notice Supernovae
Credential Certification: Ryan Foley (foley@ucsc.edu)

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We report the classifications of astrophysical transients from spectroscopic observations with the Kast spectrograph on the Shane telescope obtained on 2025 September 21 UT. The targets were supplied by XOSS, 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
 
KATS25Q012   | AT2025wfl  | 17:34:53.09  | +32:11:15.23 |       |  Other |       | (1) 
ZTF25abqkiqr | AT2025xjv  | 21:03:11.87  | -00:06:10.43 | 0.054 |   Ia   | -3 d  | (2) 
PS25hnw      | AT2025xxq  | 23:57:31.68  | -22:00:11.99 | 0.033 |   Ia   | -6 d  | (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) The spectrum shows a blue, mostly featureless continuum with a tentative detection of a weak emission line that, if real, would be consistent with H alpha at a redshift of 0. (2) We measure a Si II 6355 absorption velocity of -10,500 km/s. (3) We measure a Si II 6355 absorption velocity of -12,000 km/s.