RA/DEC (2000)
20:57:52.469 +34:16:38.65
314.4686196 +34.2774026
Type
SN Ia
Redshift
0.111
Discovery ReportClassification Report
Related AstroNotes: 2026-200
Reporting Group
GOTO
Discovering Data Source
GOTO
Discovery Date
2026-06-08 00:55:01.344
TNS AT
Y
Public
Y
Discovery Mag
19.54
Filter
L-GOTO
Reporter/s
B. Gompertz, K. Ackley, M. Dyer, J. Lyman, K. Ulaczyk, D. Steeghs, D. Galloway, V. Dhillon, P. O'Brien, G. Ramsay, K. Noysena, R. Kotak, R. Breton, J. Casares, L. Nuttall, R. Starling, B. Godson, T. Killestein, A. Kumar, D. O'Neill, M. Pursiainen, on behalf of GOTO collaboration
NEDSIMBADDECaLSPanSTARRS-1SkyMapperVizieRWISEDSSADS

Spectra

 ▌SN_2026ong - 2026-06-08 09:29:51 VLT-UT2 / X-Shooter (STARGATE)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

 ▌GOTO-N_GOTO-2_L
 ▌GOTO-N_GOTO-1_L
 ▌P48_ZTF-Cam_r
   
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
23973 2026-06-08 09:29:51 VLT-UT2 / X-Shooter 1200 Celia Desgrange (ESO), Francisco Caceres (ESA) Gregory Corcoran (UCD) STARGATE tns_2026ong_2026-06-08_09-29-51_VLT-UT2_X-Shooter_STARGATE.txt Object
Light Curves
Filter Tel / Inst Obs-date range JD Range Photometry
L-GOTO GOTO-N_GOTO-2 2026-06-07 04:13:23 - 2026-06-07 04:13:23 2461198.675962 - 2461198.675962 1
Photometry
ID Obs-date JD Mag. / Flux Err Lim. Mag./Flux Units Filter Tel / Inst Exp-time Observer/s Remarks
589740 2026-06-07 04:13:23 2461198.675962 19.6 ABMag L-GOTO GOTO-N_GOTO-2 180 [Last non detection]
L-GOTO GOTO-N_GOTO-1 2026-06-08 00:55:01 - 2026-06-08 00:55:01 2461199.538211 - 2461199.538211 1
Photometry
ID Obs-date JD Mag. / Flux Err Lim. Mag./Flux Units Filter Tel / Inst Exp-time Observer/s Remarks
589741 2026-06-08 00:55:01 2461199.538211 19.54 0.1 ABMag L-GOTO GOTO-N_GOTO-1 360
r-ZTF P48_ZTF-Cam 2026-05-24 10:52:38 - 2026-06-07 08:50:05 2461184.9532176 - 2461198.8681134 3
Photometry
ID Obs-date JD Mag. / Flux Err Lim. Mag./Flux Units Filter Tel / Inst Exp-time Observer/s Remarks
590812 2026-06-07 08:50:05 2461198.8681134 19.774 0.138423 ABMag r-ZTF P48_ZTF-Cam
590811 2026-06-02 08:43:44 2461193.8637037 20.3701 0.179868 ABMag r-ZTF P48_ZTF-Cam
590810 2026-05-24 10:52:38 2461184.9532176 20.952 ABMag r-ZTF P48_ZTF-Cam [Last non detection]
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
307976 2026-06-10 13:26:39 Fritz Jesper Sollerman (SU), Christoffer Fremling (Caltech), Daniel Perley (LJMU) et al. ZTF ZTF 20:57:52.469 +34:16:38.65 2026-06-02 08:43:43.999 20.3701 r-ZTF PSN ZTF26abahlpf ZTF N
307449 2026-06-08 08:17:19 GOTO_bot B. Gompertz, K. Ackley, M. Dyer et al. GOTO GOTO 20:57:52.464 +34:16:38.23 2026-06-08 00:55:01.344 19.54 L-GOTO Other GOTO26fqf GOTO 2026TNSTR2386....1G N
Classification Reports
ID Time received (UT) Sender Classifier/s Group Classification Redshift Spectra Related files Assoc. Groups End prop. period Remarks ADS Bibcode
23969 2026-06-08 18:34:01 Daniele Malesani 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) STARGATE SN Ia 0.111 1 STARGATE 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).
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
23973 2026-06-08 09:29:51 VLT-UT2 / X-Shooter 1200 Celia Desgrange (ESO), Francisco Caceres (ESA) Gregory Corcoran (UCD) STARGATE tns_2026ong_2026-06-08_09-29-51_VLT-UT2_X-Shooter_STARGATE.txt Object

Comments

TNS
System

Wed, 06/10/2026 - 13:26

Object coordinates updated

Object coordinates updated according to AT-report 307976 of Group ZTF
Previous RA, DEC: 20:57:52.464, +34:16:38.23 (314.468601, +34.277287)
Updated RA, DEC: 20:57:52.469, +34:16:38.65 (314.4686196, +34.2774026)