We report the spectra of seven 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 represent the first results obtained within this program. The project is still being developed and currently serves as a test case for the use of poor weather conditions to carry out transient classification. During a previous run we refined our observational setup, which are subject to additional modifications. Each of the presented spectrum was obtained with the grism R150 with a slit of 1", combining two 600-second exposures, with a 10 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), and this run has been useful for refining our target-selection procedure.
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).
| 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 | 2026dlg | 06:33:50.940 | -41:46:24.30 | Other | 0.29 | SNID associates this object with an event at redshift ~0.3. The spectrum shows three narrow features bluer than ~5200Å that we assume to be noise, cropping that section of the spectrum also results in an estimated redshift of 0.3. A faint extended source is visible at the location of the transient in the Legacy Survey viewer (Dey et al 2019, 2019AJ....157..168D). Best matched spectra suggest that the event is a galaxy. | 06:33:50.940 | -41:46:24.30 | ||||
| TNS | 2026epx | 11:40:18.830 | -39:45:10.20 | CV | 11:40:18.830 | -39:45:10.20 | CV | |||||
| TNS | 2026erw | 07:36:59.773 | +11:13:18.64 | CV | 07:36:59.773 | +11:13:18.64 | CV | |||||
| TNS | 2026esg | 13:34:51.051 | -44:32:37.94 | CV | 13:34:51.051 | -44:32:37.94 | CV | |||||
| TNS | 2026evh | 03:31:20.915 | -35:29:25.05 | SN Ia | 0.056 | Redshift from spectral matching | 03:31:20.915 | -35:29:25.05 | SN Ia | 0.056 | ||
| TNS | 2026egu | 08:38:01.077 | +09:18:24.62 | SN Ia | 0.06 | Redshift from spectral matching | 08:38:01.077 | +09:18:24.62 | SN Ia | 0.06 | ||
| TNS | 2022jla | 07:40:18.676 | +02:06:46.99 | Other | This event was first discovered in 2022 and reported again on 2026-02-25 by A. Munoz-Arancibia,F.E. Bauer,G. Pignata et al. on behalf of Alerce. The spectrum is noisy. We find no good spectral match. | 07:40:18.676 | +02:06:46.99 |
Comments