DRAFT
2026-06-03 15:36:12
Type: Object/s-Discovery/Classification
Transient Classification with Gemini
Authors: P. Pessi (NCBJ), A. Cikota (NOIRLab/Gemini South), D. May (NOIRLab/Gemini South), V. Firpo (NOIRLab/Gemini South), F. Gran (NOIRLab/Gemini South), L. Magill (NOIRLab/Gemini South), P. King (NOIRLab/Gemini South), K. Silva (NOIRLab/Gemini South), P. Candia (NOIRLab/Gemini South), R. Ruiz-Carmona (NOIRLab/Gemini South), S. Panda (NOIRLab/Gemini South), J. Font-Serra (NOIRLab/Gemini South), R. Angeloni (NOIRLab/Gemini South), V. Kalari (NOIRLab/Gemini South), C. Rodriguez (NOIRLab/Gemini South), J.-E. Heo (NOIRLab/Gemini South), E. Sabbi (NOIRLab), T. Ahumada (NOIRLab/ SOAR), R. Cartier (University of Antofagasta), S. Cikota (CAHA)
Source Group: GeminiClass
Keywords: Spectroscopy, Transient, Supernova
Abstract:
We report spectroscopic observations of three SNe Ia, two of which match the SN Ia-91T-like subclass.

We report the spectra of three transients observed with the GMOS instrument at the Gemini South telescope as part of our bad-weather filler program. This program is designed to make productive use of poor observing conditions by obtaining spectroscopic observations of recently discovered transients, with the aim of providing timely classifications to the community.

The observations presented here were obtained with the grism R150 with a slit of 1.5", combining two 600-second exposures, with a 20 nm shift between the two central wavelength settings in order to compensate for the gaps between the detector chips. 

Targets are manually selected through an automated selection system that ingest alerts from TNS and from LSST (Ivezić et al. 2019) through the ANTARES broker (Matheson et al. 2021).

The data were automatically reduced by the Gemini Archive. The classification was inferred by spectral matching using the Supernova Identification software (SNID, Blondin & Tonry 2007, 2007ApJ...666.1024B) and NGSF (Next Generation SuperFit; AstroNote 2022-191, Howell et al. 2005 2005ApJ...634.1190H).

Show current TNS values
Catalog Name Reported RA Reported DEC Reported Obj-Type Reported Redshift Host Name Host Redshift Remarks TNS RA TNS DEC TNS Obj-Type TNS Redshift
TNS 2026nxt 13:43:56.763 -27:03:09.69 SN Ia-91T-like 0.084 LEDA 760413 0.071052 Spectral matching consistent with a pre-peak SN Ia-91T-like. We note the inconsistency between the reported redshift from spectral matching and the redshift of the host. 13:43:56.763 -27:03:09.69 SN Ia-91T-like 0.084
TNS 2026nyg 16:20:03.853 -03:15:55.55 SN Ia-91T-like 0.062 LEDA 1073775 0.053379 Spectral matching consistent with a pre-peak SN Ia-91T-like. We note the inconsistency between the reported redshift from spectral matching and the redshift of the host. 16:20:03.853 -03:15:55.47 SN Ia-91T-like 0.062
TNS 2026nzw 14:10:58.051 -20:08:43.98 SN Ia 0.034 LEDA 92436 0.07439 Spectral matching consistent with a pre-peak SN Ia. We note the inconsistency between the reported redshift from spectral matching and the redshift of the host. 14:10:58.063 -20:08:43.95 SN Ia 0.034
File Comments
AT2026nxt_trim_0.txt
AT2026nzw_trim_0.txt
AT2026nyg_trim_0.txt

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