As part of the Observational Techniques II course at Stockholm University (SU) using the Nordic Optical Telescope (NOT) on La Palma for remote observing on May 6th 2025, we obtained spectroscopic observations of 2 transients. Here we report the classification obtained through spectral matching using GELATO (Harutyunyan et al. 2008) and SNID (Blondin & Tonry 2011). The observations were taken with the ALFOSC instrument mounted on the NOT using gr#4 and a 1.0 arcsec wide slit. The targets reported here were obtained from the Zwicky Transient Facility (ZTF, Bellm et al. 2019). We note that the selected targets have already been classified, here we confirm the classifications and make our spectra public.
Below we list the classified objects. All the spectra can be accessed through the Transient Name Server and also the WISeREP repository.
| 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 | 2025iig [ZTF25aaofxjv] | 14:46:46.252 | +02:20:58.63 | SN Ia-91T-like | 0.0801 | SDSS J144646.10+022058.4 | 0.08005937 | 14:46:46.252 | +02:20:58.63 | SN Ia-91T-like | 0.0801 | |
| TNS | 2025ewp [ZTF25aajfyvr] | 13:20:52.025 | +02:17:38.35 | SN II | 0.04 | Discovered as WFST0548prfg. Spectrum dominated by host lines at around 50 days from discovery. | 13:20:52.025 | +02:17:38.35 | SN II | 0.04 |
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