We report the spectra of four 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 reduced using the standard Gemini data reduction software DRAGONS, following the procedures provided by the observatory. 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).
| 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 | 2026nul | 22:39:47.901 | -14:35:51.12 | SN Ia | 0.074 | LEDA 922579 | 0.0775 | Spectral matching consistent with a SN Ia around peak. Redshift from spectral matching is consistent with the one reported for the associated host galaxy. | 22:39:47.869 | -14:35:51.58 | SN Ia | 0.074 |
| TNS | 2026nuz | 19:51:27.557 | -15:18:27.20 | CV | Spectrum appears shows Halpha at redshift 0. | 19:51:27.557 | -15:18:27.20 | CV | ||||
| TNS | 2026nvd | 23:58:13.029 | -24:54:23.72 | SN Ia-pec | 0.06 | Spectral matching consistent with a SN Ia-pec around peak. Redshift from spectral matching. | 23:58:13.029 | -24:54:23.72 | SN Ia-pec | 0.06 | ||
| TNS | 2026nwg | 00:58:47.137 | -20:50:26.68 | SN II | 0.022 | NGC 320 | 0.018379 | Spectral matching consistent with a SN II around 70 days past peak. Redshift from spectral matching is consistent with the one reported for the associated host galaxy. | 00:58:47.137 | -20:50:26.68 | SN II | 0.022 |
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