TNS Classification Report No. 23969
Date Received (UTC): 2026-06-08 18:34:01 Sender: Daniele Malesani
Group: STARGATE
G. Corcoran (UCD), L. Izzo (INAF/OAC and DARK/NBI), B. Schneider (LAM), J. An (NAOC), B. P. Gompertz (Birmingham), V. Abril-Melgarejo (LUX-Paris Obs.), D. B. Malesani (DAWN/NBI and Radboud) report/s a classification of object: SN 2026ong
Type: SN IaRedshift: 0.111
Remarks: Object located by GOTO within the localization uncertainty area of the Fermi GRB 260607A. The spectrum of the transient reveals a clear continuum with broad wiggles across the entire optical range, markedly different from GRB afterglow spectra. Template matching via SNID-SAGE (Stoppa et al. 2026, doi:10.48550/arXiv.2603.28741) indicates a good agreement with a type-Ia SN, at a redshift consistent with the galaxy redshift (z = 0.111, measured from both absorption and emission features).
The following Classification spectrum was provided:
Obsdate: 2026-06-08 09:29:51
Instrument: X-Shooter
Telescope: The Very Large Telescope - UT2
Details of the object and its spectra can be viewed here: https://www.wis-tns.org/object/2026ong
Date Received (UTC): 2026-06-08 18:34:01 Sender: Daniele Malesani
Group: STARGATE
G. Corcoran (UCD), L. Izzo (INAF/OAC and DARK/NBI), B. Schneider (LAM), J. An (NAOC), B. P. Gompertz (Birmingham), V. Abril-Melgarejo (LUX-Paris Obs.), D. B. Malesani (DAWN/NBI and Radboud) report/s a classification of object: SN 2026ong
Type: SN IaRedshift: 0.111
Remarks: Object located by GOTO within the localization uncertainty area of the Fermi GRB 260607A. The spectrum of the transient reveals a clear continuum with broad wiggles across the entire optical range, markedly different from GRB afterglow spectra. Template matching via SNID-SAGE (Stoppa et al. 2026, doi:10.48550/arXiv.2603.28741) indicates a good agreement with a type-Ia SN, at a redshift consistent with the galaxy redshift (z = 0.111, measured from both absorption and emission features).
The following Classification spectrum was provided:
Obsdate: 2026-06-08 09:29:51
Instrument: X-Shooter
Telescope: The Very Large Telescope - UT2
Details of the object and its spectra can be viewed here: https://www.wis-tns.org/object/2026ong