RA/DEC (2000)
09:59:46.483 +03:46:48.87
149.943679 +3.780242
Type
SN Ia
Redshift
0.298
Related AstroNotes: 2026-133
Reporting Group
SGLF
Discovering Data Source
Rubin
Discovery Date
2026-04-04 23:59:19.000
TNS AT
Y
Public
Y
Host Name
SDSS J095946.49+034648.1
Host Redshift
0.29799
Discovery Mag
22.15
Filter
i-LSST
Reporter/s
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

Spectra

 SN_2026ikn - 2026-05-07 00:00:00 Keck2 / KCWI (UCSC)z=
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   Binning factor: (rounded to nearest integer >1)
Mouse hovers at WL: 0 (rest),0 (observed)

Light curves

 Rubin_LSSTCam_i
   
Pointer position (MJD, Mag, Abs.Mag): (0.00, 0.00, 0.00)
Spectra
ID Obs-date (UT) Tel / Inst Exp-Time Observer/s Reducer/s Group Spectrum ascii file Spectrum fits file Spec. Type Assoc. Groups End prop. period Remarks
23686 2026-05-07 00:00:00 Keck2 / KCWI Jenna Karcheski, Ryan Foley Kishore Patra UCSC tns_2026ikn_2026-05-07_Keck2_KCWI_UCSC.flm Object
Light Curves
Filter Tel / Inst Obs-date range JD Range Photometry
i-LSST Rubin_LSSTCam 2026-04-04 23:59:19 - 2026-04-04 23:59:19 2461135.4995255 - 2461135.4995255 1
Photometry
ID Obs-date JD Mag. / Flux Err Lim. Mag./Flux Units Filter Tel / Inst Exp-time Observer/s Remarks
572462 2026-04-04 23:59:19 2461135.4995255 22.15 0.08 ABMag i-LSST Rubin_LSSTCam 30 Rubin
AT Reports
ID Time received (UT) Sender Reporter/s Reporting group Disc. Data Source RA DEC Discovery date (UT) Discovery Mag. Filter Related files AT Type Host name Internal name Assoc. Groups End prop. period Remarks ADS Bibcode Unreal Auto classification
298656 2026-04-05 11:04:52 Ismael Perez-Fournon I. Pérez-Fournon (IAC and ULL), M. Quintana-Ansaldo, I. Correa-Plasencia et al. SGLF Rubin 09:59:46.483 +03:46:48.87 2026-04-04 23:59:19.000 22.15 i-LSST PSN SDSS J095946.49+034648.1 LSST-AP-DO-170226393328648251 Rubin 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/170226393328648251/ 2026TNSTR1434....1P N
Classification Reports
ID Time received (UT) Sender Classifier/s Group Classification Redshift Spectra Related files Assoc. Groups End prop. period Remarks ADS Bibcode
23683 2026-05-11 11:00:11 Kishore C. Patra Jenna Karcheski, Kishore C. Patra, Ryan J. Foley (UCSC) UCSC SN Ia 0.298 1 UCSC We report the classification of AT 2026ikn from spectroscopic observations with the Keck Cosmic Web Imager (KCWI) Integral Field Spectrograph. Observations were made on 2026 May 7 UT. Redshift was determined using emission lines from the host galaxy. Classification was performed with SNID (Blondin & Tonry, 2007, ApJ, 666, 1024). The spectrum is highly contaminated by galaxy light. SNID template fitting was performed after subtracting a host-galaxy template spectrum. The best-fit match was SN 2005hf at +15 days past peak brightness. 2026TNSCR2052....1K
Spectra
ID Obs-date (UT) Tel / Inst Exp-Time Observer/s Reducer/s Group Spectrum ascii file Spectrum fits file Spec. Type Assoc. Groups End prop. period Remarks
23686 2026-05-07 00:00:00 Keck2 / KCWI Jenna Karcheski, Ryan Foley Kishore Patra UCSC tns_2026ikn_2026-05-07_Keck2_KCWI_UCSC.flm Object

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