DRAFT
2025-08-29 13:02:26
Type: Object/s-Discovery/Classification
Bibcode: 2025TNSAN.273....1W
GOTO-FAST spectroscopic classifications of optical transients
Authors: I. Worssam, M. Pursiainen, J. Lyman, D. O'Neill, T. Killestein, K. Ackley, M. Dyer, K. Ulaczyk, D. Steeghs, D. Galloway, V. Dhillon, P. O'Brien, G. Ramsay, K. Noysena, R. Kotak, R. Breton, J. Casares, L. Nuttall, B. Godson, A. Kumar on behalf of GOTO collaboration
Source Group: GOTO
Keywords: Transient, Supernova, Optical, Spectroscopy
Abstract:
This report includes classifications of 1 Type Ia and 3 Type Ic SNe (including 1 type Ic-BL). Of note is SN 2025vzq, a very young and rising Type Ic SNe discovered by GOTO in the galaxy NGC 7606 at a distance of ~30 Mpc.

GOTO-FAST reports the classifications of the following optical transients. The observations were obtained on the Nordic Optical Telescope (NOT) on the night of 2025 Aug 28 using the ALFOSC spectrograph with Gr4 grating (3200-9600 Å, R ~360). The transients were classified using SNID-SAGE (Stoppa 2025), SNID (Blondin & Tonry 2007) and GELATO (Harutyunyan et al. 2008).

Targets were  supplied by the Gravitational-wave Optical Transient Observer GOTO (Steeghs et al. 2022, Dyer et al. 2024) and the Zwicky Transient Facility ZTF (Bellm et al. 2019) - data stream processed through the ALeRCE broker (Forster et al. 2020)

The classified objects are listed below in the Related Objects Table.

 

Show current TNS values
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 2025vzq [GOTO25glk] 23:19:04.806 -08:28:39.28 SN Ic 0.007452 NGC 7606 0.007542 Consistent with a type Ic SN ~1-2 weeks pre-peak. In agreement with the current light curve evolution. Redshift from host galaxy. 23:19:04.800 -08:28:39.48 SN Ic 0.007452
TNS 2025vef [ZTF25ablgkgi] 01:25:13.058 +01:59:04.59 SN Ic-BL 0.03 Good match to type Ic-BL SN 2003jd at peak. 01:25:13.054 +01:59:04.44 SN Ic-BL 0.03
TNS 2025vcj [GOTO25gee] 04:30:08.733 -23:38:02.04 SN Ia 0.09 Consistent with a Ia around peak. 04:30:08.733 -23:38:02.04 SN Ia 0.09
TNS 2025ugi [GOTO25fxh] 00:17:05.294 -06:22:18.38 SN Ic 0.027 Redshift from narrow lines. 00:17:05.294 -06:22:18.38 SN Ic 0.027
AstroNote Publication Timestamp Title Authors
2023-224 2023-08-14 15:35:44 GOTO-FAST spectroscopic classifications of optical transients B. Godson, B. Warwick, D. O'Neill, J. Lyman, T. Killestein, M. Pursiainen, D. Coppejans, G. Ramsay, R. Kotak, K. Ackley, M. J. Dyer, K. Ulaczyk, F. Jiminez-Ibarra, A. Kumar, D. Steeghs, D. K. Galloway, V. Dhillon, P. O'Brien, K. Noysena, R. P. Breton, L. K. Nuttall, E. Pall'e, D. Pollacco on behalf of GOTO

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