RA/DEC (2000)
09:25:46.427 +02:13:46.81
141.443444458 +2.22966876033
Type
SN Ia
Redshift
0.0218
Discovery ReportClassification Report
Reporting Group
GOTO
Discovering Data Source
GOTO
Discovery Date
2026-03-20 11:00:35.136
TNS AT
Y
Public
Y
Discovery Mag
19.04
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_2026gud - 2026-03-23 04:34:08 FLWO-1.5m / FAST (VHU-TDA)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
 ▌PS2_GPC2_w
 ▌ATLAS-CHL_ATLAS-04_cyan
 ▌GOTO-N_GOTO-1_L
 ▌BG4_BlackGEM-Cam4_BG-q
 ▌BG2_BlackGEM-Cam2_BG-q
 ▌P48_ZTF-Cam_i
 ▌P48_ZTF-Cam_g
 ▌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
23326 2026-03-23 04:34:08 FLWO-1.5m / FAST S. Karthik Yadavalli (Harvard/CfA), Yize Dong (Harvard/CfA) S. Karthik Yadavalli (Harvard/CfA), Yize Dong (Harvard/CfA) VHU-TDA tns_2026gud_2026-03-23_04-34-08.000_FLWO-1.5m_FAST_VHU-TDA.ascii Object
Light Curves
Filter Tel / Inst Obs-date range JD Range Photometry
L-GOTO GOTO-S_GOTO-3 2026-03-20 11:00:35 - 2026-03-20 11:00:35 2461119.958742 - 2461119.958742 1
Photometry
ID Obs-date JD Mag. / Flux Err Lim. Mag./Flux Units Filter Tel / Inst Exp-time Observer/s Remarks
568860 2026-03-20 11:00:35 2461119.958742 19.04 0.07 ABMag L-GOTO GOTO-S_GOTO-3 180
w-P1 PS2_GPC2 2026-04-19 06:31:30 - 2026-04-19 06:31:30 2461149.77187 - 2461149.77187 1
Photometry
ID Obs-date JD Mag. / Flux Err Lim. Mag./Flux Units Filter Tel / Inst Exp-time Observer/s Remarks
577992 2026-04-19 06:31:30 2461149.77187 17.19 0.01 22 ABMag w-P1 PS2_GPC2 45 Robot
cyan-ATLAS ATLAS-CHL_ATLAS-04 2026-03-20 03:13:38 - 2026-03-20 03:13:38 2461119.63447 - 2461119.63447 1
Photometry
ID Obs-date JD Mag. / Flux Err Lim. Mag./Flux Units Filter Tel / Inst Exp-time Observer/s Remarks
570068 2026-03-20 03:13:38 2461119.63447 19.5 ABMag cyan-ATLAS ATLAS-CHL_ATLAS-04 30 Robot [Last non detection]
L-GOTO GOTO-N_GOTO-1 2026-03-16 21:55:05 - 2026-03-16 21:55:05 2461116.413254 - 2461116.413254 1
Photometry
ID Obs-date JD Mag. / Flux Err Lim. Mag./Flux Units Filter Tel / Inst Exp-time Observer/s Remarks
568859 2026-03-16 21:55:05 2461116.413254 20 ABMag L-GOTO GOTO-N_GOTO-1 180 [Last non detection]
BG-q-BlackGem BG4_BlackGEM-Cam4 2026-03-24 03:00:21 - 2026-03-24 03:00:21 2461123.6252431 - 2461123.6252431 1
Photometry
ID Obs-date JD Mag. / Flux Err Lim. Mag./Flux Units Filter Tel / Inst Exp-time Observer/s Remarks
569560 2026-03-24 03:00:21 2461123.6252431 17.6 0.03 20.87 ABMag BG-q-BlackGem BG4_BlackGEM-Cam4 60 robotic
BG-q-BlackGem BG2_BlackGEM-Cam2 2025-12-30 07:04:32 - 2025-12-30 07:04:32 2461039.7948148 - 2461039.7948148 1
Photometry
ID Obs-date JD Mag. / Flux Err Lim. Mag./Flux Units Filter Tel / Inst Exp-time Observer/s Remarks
569559 2025-12-30 07:04:32 2461039.7948148 20.67 ABMag BG-q-BlackGem BG2_BlackGEM-Cam2 60 robotic [Last non detection]
i-ZTF P48_ZTF-Cam 2026-03-19 06:41:14 - 2026-03-22 06:40:50 2461118.7786343 - 2461121.7783565 2
Photometry
ID Obs-date JD Mag. / Flux Err Lim. Mag./Flux Units Filter Tel / Inst Exp-time Observer/s Remarks
569168 2026-03-22 06:40:50 2461121.7783565 17.9585 0.115894 ABMag i-ZTF P48_ZTF-Cam
569167 2026-03-19 06:41:14 2461118.7786343 19.8186 0.174947 ABMag i-ZTF P48_ZTF-Cam
g-ZTF P48_ZTF-Cam 2026-03-18 08:10:58 - 2026-03-20 06:45:12 2461117.8409491 - 2461119.7813889 3
Photometry
ID Obs-date JD Mag. / Flux Err Lim. Mag./Flux Units Filter Tel / Inst Exp-time Observer/s Remarks
570314 2026-03-20 06:45:12 2461119.7813889 18.9847 0.099235 20.3762 ABMag g-ZTF P48_ZTF-Cam 30 Robot Data provided by ZTF, classified by Fink
570313 2026-03-19 08:28:31 2461118.8531366 20.1059 ABMag g-ZTF P48_ZTF-Cam 30 Robot [Last non detection] Data provided by ZTF, classified by Fink
569166 2026-03-18 08:10:58 2461117.8409491 20.0807 ABMag g-ZTF P48_ZTF-Cam [Last non detection]
orange-ATLAS ATLAS-MLO_ATLAS-01 2026-03-25 08:45:07 - 2026-03-25 08:45:07 2461124.86466 - 2461124.86466 1
Photometry
ID Obs-date JD Mag. / Flux Err Lim. Mag./Flux Units Filter Tel / Inst Exp-time Observer/s Remarks
570069 2026-03-25 08:45:07 2461124.86466 17.235 0.04 19.37 ABMag orange-ATLAS ATLAS-MLO_ATLAS-01 30 Robot
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
301492 2026-04-25 19:20:16 PS1_Bot1 K. C. Chambers, T. de Boer, J. Fairlamb et al. Pan-STARRS Pan-STARRS 09:25:46.427 +02:13:46.81 2026-04-19 06:31:29.568 17.19 w-P1 PSN PS26bdb Pan-STARRS N
297462 2026-03-26 19:47:18 Fink Julien Peloton, Anais Moller, Emille E. O. Ishida on behalf of the Fink broker Fink ZTF 09:25:46.433 +02:13:46.79 2026-03-20 06:45:12.001 18.9847 g-ZTF PSN ZTF26aannuvu ZTF Early SN Ia candidate classified by Fink using the public ZTF stream. Object data at https://fink-portal.org/ZTF26aannuvu N
297348 2026-03-25 15:51:33 ATLAS_Bot1 J. Tonry, L. Denneau, H. Weiland (IfA, University of Hawaii) et al. ATLAS ATLAS 09:25:46.437 +02:13:46.81 2026-03-25 08:45:06.624 17.235 orange-ATLAS PSN ATLAS26dgu ATLAS N
297108 2026-03-24 08:27:02 BlackGEM_Bot1 L. Landsberg, H. Tranin, F. Stoppa et al. BlackGEM BlackGEM 09:25:46.438 +02:13:46.79 2026-03-24 03:00:21.000 17.6 BG-q-BlackGem PSN BGEM J092546.44+021346.8 BlackGEM N
296928 2026-03-22 08:11:40 BTSbot_bot Nabeel Rehemtulla (CIERA, NU), Wynn Jacobson-Galán (Caltech), Theophile du Laz (Caltech) on behalf of ZTF ZTF ZTF 09:25:46.433 +02:13:46.77 2026-03-19 06:41:14.003 19.8186 i-ZTF PSN ZTF26aannuvu ZTF Bright (m_peak <= 18.5) transient candidate identified autonomously by BTSbot (Rehemtulla et al. 2024; arXiv:2401.15167). N
296797 2026-03-20 13:48:20 GOTO_bot D. O'Neill, K. Ackley, M. Dyer et al. GOTO GOTO 09:25:46.387 +02:13:46.63 2026-03-20 11:00:35.136 19.04 L-GOTO Other GOTO26cfq GOTO 2026TNSTR1196....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
23324 2026-03-23 05:25:06 Srisurya Yadavalli S. Karthik Yadavalli (Harvard/CfA), Yize Dong (Harvard/CfA), Anya Nugent (Harvard/CfA), V. Ashley Villar (Harvard/CfA), Alex Gagliano (Harvard/CfA), Kaylee de Soto (Harvard/CfA) VHU-TDA SN Ia 0.0218 1 1 VHU-TDA redshift found using galaxy lines, closest spectral match is 1998aq at -10 days, classified using snid-sage 2026TNSCR1254....1Y
Related files
File Comments Last Modified (UT) Modified By
tns_2026gud_atrep_23324_VHU-TDA.png 2026-03-23 05:25:06 Srisurya Yadavalli
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
23326 2026-03-23 04:34:08 FLWO-1.5m / FAST S. Karthik Yadavalli (Harvard/CfA), Yize Dong (Harvard/CfA) S. Karthik Yadavalli (Harvard/CfA), Yize Dong (Harvard/CfA) VHU-TDA tns_2026gud_2026-03-23_04-34-08.000_FLWO-1.5m_FAST_VHU-TDA.ascii Object

Comments

TNS
System

Sat, 04/25/2026 - 19:20

Object coordinates updated

Object coordinates updated according to AT-report 301492 of Group Pan-STARRS
Previous RA, DEC: 09:25:46.433, +02:13:46.79 (141.44346961429, +2.2296627785714)
Updated RA, DEC: 09:25:46.427, +02:13:46.81 (141.443444458, +2.22966876033)

TNS
System

Thu, 03/26/2026 - 19:47

Object coordinates updated

Object coordinates updated according to AT-report 297462 of Group ZTF
Previous RA, DEC: 09:25:46.433, +02:13:46.77 (141.4434713, +2.229659)
Updated RA, DEC: 09:25:46.433, +02:13:46.79 (141.44346961429, +2.2296627785714)

TNS
System

Sun, 03/22/2026 - 08:11

Object coordinates updated

Object coordinates updated according to AT-report 296928 of Group ZTF
Previous RA, DEC: 09:25:46.387, +02:13:46.63 (141.443278, +2.229619)
Updated RA, DEC: 09:25:46.433, +02:13:46.77 (141.4434713, +2.229659)