ePESSTO+, the advanced Public ESO Spectroscopic Survey for Transient Objects (Smartt et al. 2015 2015A&A...579A..40S), reports the following supernova classifications.
Targets were supplied by the ATLAS survey (Smith et al. 2020 2020PASP..132h5002S), the Zwicky Transient Facility ZTF (Bellm et al. 2019 2019PASP..131a8002B) - data stream processed through the ALeRCE broker (Forster et al. 2020 2021AJ....161..242F) and the Gravitational-wave Optical Transient Observer GOTO (see Dyer et al. 2020, SPIE, 11445 2020SPIE11445E..7GD).
Observations were performed on the ESO New Technology Telescope (NTT) at La Silla on the night of 2025 May 19, using EFOSC2 and Grism 13 (3985-9315A, 18A resolution) and Grism 11 (3380-7520A, 16A resolution). Classifications were done using NGSF (Next Generation SuperFit; AstroNote 2022-191, Howell et al. 2005 2005ApJ...634.1190H), DASH (Muthukrishna et al. 2019 2019ApJ...885...85M), and GELATO (Harutyunyan et al. 2008 2008A&A...488..383H).
The classification spectra and additional details can be obtained from http://www.pessto.org (via WISeREP) and the IAU Transient Name Server.
The classified objects are listed in the Related Objects table below.
| Catalog | Name | Reported RA | Reported DEC | Reported Obj-Type | Reported Redshift | Host Name | Host Redshift | Source | Phase (days) | Remarks | TNS RA | TNS DEC | TNS Obj-Type | TNS Redshift |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| TNS | 2025iyj [ATLAS25emg] | 11:10:47.712 | +28:43:39.08 | SN Ia-91T-like | 0.03 | Abell 1185 | Around peak | In Abell 1185 galaxy cluster. Redshift from the cluster. Good match from NGSF and ASTRODASH. | 11:10:47.703 | +28:43:39.01 | SN Ia-91T-like | 0.03 | ||
| TNS | 2025jzi [ATLAS25evh] | 09:23:21.805 | -20:20:31.92 | SN II | 0.039 | WISEA J092321.66-202025.8 | Around peak | Redshift from the host emission lines from Lidman et al. 2025TNSCR1764....1L. Convincing broad H-alpha in the spectrum. | 09:23:21.805 | -20:20:31.92 | SN II | 0.039 | ||
| TNS | 2025gsa [GOTO25blw] | 09:55:09.399 | -72:08:43.73 | SN IIn | 0.07 | WISEA J095508.45-720843.2 | +50d from detection. | Good match with type IIn SN at phase greater than 60 days, which is consistent with light curve having first detection about 51 days ago. Redshift is from the NGSF match. | 09:55:09.399 | -72:08:43.73 | SN IIn | 0.07 | ||
| TNS | 2025kne [ATLAS25ezd] | 13:41:02.639 | +14:54:05.18 | SN | 0.042 | WISEA J134201.55+145404.7 | The redshift is from the host galaxy (NED). Convincing host H-alpha emission line. | 13:41:02.619 | +14:54:05.16 | SN II | 0.042 | |||
| TNS | 2025igr [ATLAS25ecj] | 19:05:37.301 | -58:49:34.92 | SN Ia-91T-like | 0.08 | Good match with Type Ia-91T-like SN using NGSF and ASTRODASH. Unusually flat light curve from ATLAS. | 19:05:37.301 | -58:49:34.92 | SN Ia-91T-like | 0.08 | ||||
| TNS | 2025ijj [ATLAS25eff] | 19:29:46.569 | -84:12:19.78 | SN Ia | 0.048 | WISEA J192946.10-841219.8 | Post peak | The redshift is from the host galaxy (NED). Good match with normal Ia from NGSF. | 19:29:46.569 | -84:12:19.78 | SN Ia | 0.048 | ||
| TNS | 2025iic [ZTF25aaohnzw] | 18:30:06.380 | +28:19:29.04 | SN Ia | 0.09 | Post peak | Good match with type Ia SN from GELATO and NGSF. | 18:30:06.369 | +28:19:28.70 | SN Ia | 0.09 | |||
| TNS | 2025efq [GOTO25baq] | 20:27:09.924 | -35:14:41.42 | SN Ic | 0.0107 | +50d from peak | Good match with both Ib and Ic from NGSF. Already classified as a type Ic SN (Martin et al. 2025TNSCR1714....1M). | 20:27:09.936 | -35:14:41.36 | SN Ic | 0.0107 | |||
| TNS | 2025irc [ATLAS25elq] | 21:59:27.130 | -56:07:10.11 | SN Ia | 0.04 | WISEA J215928.01-560706.7 | Post peak. | Good match with normal type Ia from ASTRODASH. The redshift is from the SN template match. | 21:59:27.130 | -56:07:10.11 | SN Ia | 0.04 |
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