RA/DEC (2000)
09:56:52.772 +01:49:59.18
149.21988501566 +1.8331041817291
Type
SN Ia
Redshift
0.21
Discovery ReportClassification Report
Related AstroNotes: 2026-108, 2026-133
Reporting Group
Lasair
Discovering Data Source
Rubin
Discovery Date
2026-04-21 00:50:54.240
TNS AT
Y
Public
Y
Discovery Mag
22.5328
Filter
u-LSST
Reporter/s
H. F. Stevance, K. W. Smith, S. J. Smartt (Oxford/QUB), R. D. Williams, G. P. Francis (Edinburgh), D. R. Young (QUB), A. Lawrence, T. M. Sloan (Edinburgh)
NEDSIMBADDECaLSPanSTARRS-1SkyMapperVizieRWISEDSSADS

Spectra

 ▌SN_2026kfw - 2026-05-07 00:00:00 Keck2 / KCWI (UCSC)z=
▌Show H at z=vexp= km/s
▌Show He at z=vexp= km/s
▌Show He II at z=vexp= km/s
▌Show C II at z=vexp= km/s
▌Show C III at z=vexp= km/s
▌Show C IV at z=vexp= km/s
▌Show N II at z=vexp= km/s
▌Show N III at z=vexp= km/s
▌Show N IV at z=vexp= km/s
▌Show N V at z=vexp= km/s
▌Show O at z=vexp= km/s
▌Show [O I] at z=vexp= km/s
▌Show O II at z=vexp= km/s
▌Show [O II] at z=vexp= km/s
▌Show [O III] at z=vexp= km/s
▌Show O V at z=vexp= km/s
▌Show O VI at z=vexp= km/s
▌Show Na at z=vexp= km/s
▌Show Mg at z=vexp= km/s
▌Show Mg II at z=vexp= km/s
▌Show Si II at z=vexp= km/s
▌Show S II at z=vexp= km/s
▌Show Ca II at z=vexp= km/s
▌Show [Ca II] at z=vexp= km/s
▌Show Fe II at z=vexp= km/s
▌Show Fe III at z=vexp= km/s
▌Show Å at z=vexp= km/s
▌Show Å at z=vexp= km/s
▌Show Å at z=vexp= km/s
▌Show Å at z=vexp= km/s
▌Show Tellurics 
▌Show Galaxy lines at z=
▌Show WR-WN at z=vexp= km/s
▌Show WR-WC/O at z=vexp= km/s
   Binning factor: (rounded to nearest integer >1)
Mouse hovers at WL: 0 (rest),0 (observed)

Light curves

 ▌Rubin_LSSTCam_u
   
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
23684 2026-05-07 00:00:00 Keck2 / KCWI Jenna Karcheski Kishore Patra UCSC tns_2026kfw_2026-05-07_Keck2_KCWI_UCSC.flm Object
Light Curves
Filter Tel / Inst Obs-date range JD Range Photometry
u-LSST Rubin_LSSTCam 2026-04-21 00:50:54 - 2026-04-21 00:50:54 2461151.53535 - 2461151.53535 1
Photometry
ID Obs-date JD Mag. / Flux Err Lim. Mag./Flux Units Filter Tel / Inst Exp-time Observer/s Remarks
576710 2026-04-21 00:50:54 2461151.53535 22.5328 0.0942468 ABMag u-LSST Rubin_LSSTCam
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
300853 2026-04-21 08:56:58 LVRA H. F. Stevance, K. W. Smith, S. J. Smartt (Oxford/QUB) et al. Lasair Rubin 09:56:52.772 +01:49:59.18 2026-04-21 00:50:54.240 22.5328 u-LSST PSN LSST-AP-DO-170257199649521669 Rubin 2026TNSTR1751....1S N
Classification Reports
ID Time received (UT) Sender Classifier/s Group Classification Redshift Spectra Related files Assoc. Groups End prop. period Remarks ADS Bibcode
23681 2026-05-11 10:50:49 Kishore C. Patra Jenna Karcheski, Kishore C. Patra, Ryan J. Foley (UCSC) UCSC SN Ia 0.21 1 UCSC We report the classification of AT 2026kfw from spectroscopic observations with the Keck Cosmic Web Imager (KCWI) Integral Field Spectrograph. Observations were made on 2026 May 7 UT. Classification was performed with SNID (Blondin & Tonry, 2007, ApJ, 666, 1024). We measure Si II 6355 velocity of -12,500 km/s. 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
23684 2026-05-07 00:00:00 Keck2 / KCWI Jenna Karcheski Kishore Patra UCSC tns_2026kfw_2026-05-07_Keck2_KCWI_UCSC.flm Object

Comments