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 (except for 2026mza for which we obtained two 900-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 automatically selected from the Transient Name Server (TNS), with an updated automated selection system soon to be deployed in order to have better control over the selected targets.
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).
| 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 | 2026nuh | 23:17:23.114 | -41:54:50.59 | SN Ia | 0.056 | LEDA 123604 | 0.056749 | Spectral matching consistent with a SN Ia at around peak. Redshift from spectral matching agrees with the one reported for the associated host galaxy. The region between 7000AA and 8000AA was severely affected by artifacts and thus was removed from the spectrum without affecting the classification. | 23:17:23.114 | -41:54:50.59 | SN Ia | 0.056 |
| TNS | 2026nuv | 11:20:31.577 | -09:00:41.89 | SN Ia | 0.02 | NGC 3635 | 0.022732 | Spectral matching consistent with a pre-peak SN Ia. Redshift from spectral matching agrees with the one reported for the associated host galaxy. | 11:20:31.594 | -09:00:41.65 | SN Ia | 0.02 |
| TNS | 2026mza | 10:04:39.248 | +02:30:26.81 | SN Ia | 0.12 | SDSS J100439.08+023025.9 | 0.12252 | Spectral matching consistent with a SN Ia at around peak. Redshift from spectral matching. | 10:04:39.248 | +02:30:26.81 | SN Ia | 0.12 |
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