TNS Astronomical Transient Report No. 307193

Date Received (UTC): 2026-06-06 06:50:35
Date made public:
Sender: Ismael Perez-Fournon
Reporting Group: SGLF     Discovery Data Source: Rubin

I. Pérez-Fournon (IAC and ULL), M. Quintana-Ansaldo, I. Correa-Plasencia, D. Cano-Morales, A.E. Hernández-Díaz, E. Lekaroz-Urriza (ULL), F. Poidevin (IAC and ULL), C. Jiménez Ángel (GRANTECAN), R. Shirley (MPE), R. Marques-Chaves (Univ. of Geneva), and S. Geier (GRANTECAN & IAC) on behalf of SGLF report/s the discovery of a new astronomical transient.

IAU Designation: AT 2026oix
Discoverer internal name: LSST-AP-DO-170455096977522737
Coordinates (J2000): RA = 09:58:04.628 (149.519283) DEC = +01:48:52.24 (1.814511)
Discovery date: 2026-05-26 23:29:50.000 (JD=2461187.4790509)

Potential host galaxy: SDSS J095804.64+014852.0
Host redshift: 0.2011

Remarks: Rubin SN candidate in the COSMOS DDF field discovered using the public LSST alerts, the LSST brokers, and our SGLF filters. LSST light curve available at the LSST brokers, e.g.: https://lasair.lsst.ac.uk/objects/170455096977522737/

Photometry

Discovery (first detection):
Discovery date: 2026-05-26 23:29:50.000
Flux: 23.08 ABMag
Filter: g-LSST
Instrument: LSSTCam
Telescope: Rubin Observatory - Simonyi Survey Telescope

Last non-detection:
Archival info: Other
Remarks: SN candidate close to a catalogued galaxy

Details of the new object can be viewed here: https://sandbox.wis-tns.org/object/2026oix