Spectroscopic Classifications with the SNIFS spectrograph on the UH88-inch Telescope

ATel #17475; A. Bridges, Y. Cheng, A. Coffey, A. Gilbert, O. Kangwai (UH Hilo), C. Angus (Queen’s University Belfast), W. B. Hoogendam, D. O. Jones, M. Kong (IfA, UH Manoa)
on 4 Nov 2025; 17:52 UT
Distributed as an Instant Email Notice Supernovae
Credential Certification: David Jones (david.jones@ucsc.edu)

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We report the following classifications from spectroscopic observations with the SNIFS spectrograph on the UH88 telescope, obtained on 2025 Nov 2 UT through the SCAT survey (Tucker et al. 2022). The targets were supplied by ATLAS (Tonry et al. 2018) and ZTF (Bellm et al. 2019) and classified by students in the UH Hilo Stellar Physics Lab course. The classifications were performed with SNID (Blondin & Tonry, 2007).

 
Name         | IAU Name   | RA (J2000)  | Dec (J2000)  | z       | Type | Notes 
ATLAS25nju   | AT2025abva | 22:33:42.67 | -43:41:37.30 | 0.036   | Ia   | (1) 
ATLAS25ndj   | AT2025abgq | 22:37:02.36 | -18:59:22.08 | 0.04881 | Ia   | (2) 
ATLAS25nlw   | AT2025abyc | 02:44:25.31 | -24:34:08.58 | 0.02    | II   | (3) 
ZTF25abzrrhe | AT2025abmd | 04:04:53.45 | +12:40:55.19 | 0.03451 | II   | (4) 

Notes: When the redshift is given to 3 decimal places or less, it is derived from the SN spectrum. Otherwise, the redshift is determined from the host galaxy. (1) We measure a Si II velocity of -11,900 km/s. SNID matches are consistent with a phase slightly before maximum light. (2) We measure a Si II velocity of -12,800 km/s using the NED redshift of 0.04881. SNID indicates a phase near maximum light. (3) Blue continuum with evidence for H-alpha at the approximate, best-fit SNID redshift of 0.02. (4) The listed redshift is from NED. Blue continuum is present with evidence for broadened H alpha.