RA/DEC (2000)
12:46:43.531 -40:01:30.26
191.68138 -40.0250725
Type
SN IIb
Redshift
0.015
Discovery ReportClassification Report
Related AstroNotes: 2026-182
Reporting Group
GOTO
Discovering Data Source
GOTO
Discovery Date
2026-05-24 09:31:22.656
TNS AT
Y
Public
Y
Discovery Mag
18.7
Filter
L-GOTO
Reporter/s
D. O'Neill, 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. Gompertz, B. Godson, T. Killestein, A. Kumar, M. Pursiainen, on behalf of GOTO collaboration
NEDSIMBADDECaLSPanSTARRS-1SkyMapperVizieRWISEDSSADS

Spectra

 ▌SN_2026nmw - 2026-06-05 04:05:57 ESO-NTT / EFOSC2-NTT (ePESSTO+)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-S_GOTO-3_L
 ▌ATLAS-CHL_ATLAS-04_orange
 ▌ATLAS-MLO_ATLAS-01_orange
   
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
23948 2026-06-05 04:05:57 ESO-NTT / EFOSC2-NTT 800 C.G. Touchard-Paxton, M. Ghendrih, E. Charleton N. Shiamtanis ePESSTO+ tns_2026nmw_2026-06-05_04-05-57_ESO-NTT_EFOSC2-NTT_ePESSTO+.asci tns_2026nmw_2026-06-05_04-05-57_ESO-NTT_EFOSC2-NTT_ePESSTO+.fits Object
Light Curves
Filter Tel / Inst Obs-date range JD Range Photometry
L-GOTO GOTO-S_GOTO-3 2026-05-21 10:36:50 - 2026-05-24 09:31:23 2461181.942242 - 2461184.896788 2
Photometry
ID Obs-date JD Mag. / Flux Err Lim. Mag./Flux Units Filter Tel / Inst Exp-time Observer/s Remarks
585021 2026-05-24 09:31:23 2461184.896788 18.7 0.09 ABMag L-GOTO GOTO-S_GOTO-3 180
585020 2026-05-21 10:36:50 2461181.942242 20 ABMag L-GOTO GOTO-S_GOTO-3 180 [Last non detection]
orange-ATLAS ATLAS-CHL_ATLAS-04 2026-05-25 02:31:22 - 2026-05-25 02:31:22 2461185.60512 - 2461185.60512 1
Photometry
ID Obs-date JD Mag. / Flux Err Lim. Mag./Flux Units Filter Tel / Inst Exp-time Observer/s Remarks
587918 2026-05-25 02:31:22 2461185.60512 18.588 0.132 19.16 ABMag orange-ATLAS ATLAS-CHL_ATLAS-04 30 Robot
orange-ATLAS ATLAS-MLO_ATLAS-01 2026-05-23 07:56:59 - 2026-05-23 07:56:59 2461183.83124 - 2461183.83124 1
Photometry
ID Obs-date JD Mag. / Flux Err Lim. Mag./Flux Units Filter Tel / Inst Exp-time Observer/s Remarks
587917 2026-05-23 07:56:59 2461183.83124 19.08 ABMag orange-ATLAS ATLAS-MLO_ATLAS-01 30 Robot [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
306556 2026-05-30 09:21:26 ATLAS_Bot1 J. Tonry, L. Denneau, H. Weiland (IfA, University of Hawaii) et al. ATLAS ATLAS 12:46:43.531 -40:01:30.26 2026-05-25 02:31:22.368 18.588 orange-ATLAS PSN ATLAS26gni ATLAS N
305086 2026-05-24 10:09:51 GOTO_bot D. O'Neill, K. Ackley, M. Dyer et al. GOTO GOTO 12:46:43.536 -40:01:30.94 2026-05-24 09:31:22.656 18.7 L-GOTO Other GOTO26fdl GOTO 2026TNSTR2257....1O N
Classification Reports
ID Time received (UT) Sender Classifier/s Group Classification Redshift Spectra Related files Assoc. Groups End prop. period Remarks ADS Bibcode
23944 2026-06-05 15:32:09 ePESSTOplus_Bot1 C.G. Touchard-Paxton, M. Ghendrih, E. Charleton, N. Shiamtanis, O. Yaron on behalf of ePESSTO+ ePESSTO+ SN IIb 0.015 1 ePESSTO+
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
23948 2026-06-05 04:05:57 ESO-NTT / EFOSC2-NTT 800 C.G. Touchard-Paxton, M. Ghendrih, E. Charleton N. Shiamtanis ePESSTO+ tns_2026nmw_2026-06-05_04-05-57_ESO-NTT_EFOSC2-NTT_ePESSTO+.asci tns_2026nmw_2026-06-05_04-05-57_ESO-NTT_EFOSC2-NTT_ePESSTO+.fits Object

Comments

TNS
System

Sat, 05/30/2026 - 09:21

Object coordinates updated

Object coordinates updated according to AT-report 306556 of Group ATLAS
Previous RA, DEC: 12:46:43.536, -40:01:30.94 (191.681399, -40.025262)
Updated RA, DEC: 12:46:43.531, -40:01:30.26 (191.68138, -40.0250725)