RA/DEC (2000)
13:44:36.132 -29:55:52.58
206.150548173 -29.9312735936
Type
SN II
Redshift
0.038
Discovery ReportClassification Report
Related AstroNotes: 2026-59
Reporting Group
ATLAS
Discovering Data Source
ATLAS
Discovery Date
2025-12-16 01:40:40.224
TNS AT
Y
Public
Y
Discovery Mag
17.962
Filter
cyan-ATLAS
Reporter/s
J. Tonry, L. Denneau, H. Weiland (IfA, University of Hawaii), N. Erasmus, W. Koorts (South African Astronomical Observatory), A. Jordan, V. Suc (UAI, Obstech), M. R. Alarcón, J. Licandro, P. Nichita (IAC), S. J. Smartt, K. W. Smith (Oxford/QUB), D. R. Young, M. Nicholl, M. Fulton, M. McCollum, T. Moore, J. Weston, X. Sheng, C. R. Angus, A. Wilson, A. Aamer, D. Magill, P. J. Broda, A. J. Smith (QUB), P. Ramsden (Birmingham/QUB), L. Shingles (GSI/QUB), S. Srivastav, J. H. Gillanders, H. Stevance, A. J. Cooper, F. Stoppa, J. Tweddle, L. Eastman (Oxford), L. Rhodes (TSI/McGill), A. Rest (STScI), T.-W. Chen (NCU), C. Stubbs (Harvard), J. S. Sommer (LMU), B. P. Schmidt (ANU)
NEDSIMBADDECaLSPanSTARRS-1SkyMapperVizieRWISEDSSADS

Spectra

 ▌SN_2025ahby - 2026-03-06 00:00:00 Gemini-S / GMOS-S (None)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-4_L
 ▌ATLAS-STH_ATLAS-03_orange
 ▌ATLAS-STH_ATLAS-03_cyan
 ▌BG3_BlackGEM-Cam3_BG-q
 ▌BG2_BlackGEM-Cam2_BG-q
 ▌PS1_GPC1_w
   
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
23144 2026-03-06 00:00:00 Gemini-S / GMOS-S Gemini None tns_2025ahby_2026-03-06_Gemini-S_GMOS-S_None.txt Object
Light Curves
Filter Tel / Inst Obs-date range JD Range Photometry
L-GOTO GOTO-S_GOTO-4 2025-08-23 08:45:15 - 2026-01-21 17:40:53 2460910.864763 - 2461062.236733 2
Photometry
ID Obs-date JD Mag. / Flux Err Lim. Mag./Flux Units Filter Tel / Inst Exp-time Observer/s Remarks
552642 2026-01-21 17:40:53 2461062.236733 18.73 0.06 ABMag L-GOTO GOTO-S_GOTO-4 135
552641 2025-08-23 08:45:15 2460910.864763 19 ABMag L-GOTO GOTO-S_GOTO-4 90 [Last non detection]
orange-ATLAS ATLAS-STH_ATLAS-03 2025-09-10 17:52:52 - 2025-09-10 17:52:52 2460929.24505 - 2460929.24505 1
Photometry
ID Obs-date JD Mag. / Flux Err Lim. Mag./Flux Units Filter Tel / Inst Exp-time Observer/s Remarks
539331 2025-09-10 17:52:52 2460929.24505 18.76 ABMag orange-ATLAS ATLAS-STH_ATLAS-03 30 Robot [Last non detection]
cyan-ATLAS ATLAS-STH_ATLAS-03 2025-12-16 01:40:40 - 2025-12-16 01:40:40 2461025.56991 - 2461025.56991 1
Photometry
ID Obs-date JD Mag. / Flux Err Lim. Mag./Flux Units Filter Tel / Inst Exp-time Observer/s Remarks
539332 2025-12-16 01:40:40 2461025.56991 17.962 0.087 19.08 ABMag cyan-ATLAS ATLAS-STH_ATLAS-03 30 Robot
BG-q-BlackGem BG3_BlackGEM-Cam3 2025-12-31 08:31:29 - 2025-12-31 08:31:29 2461040.8551968 - 2461040.8551968 1
Photometry
ID Obs-date JD Mag. / Flux Err Lim. Mag./Flux Units Filter Tel / Inst Exp-time Observer/s Remarks
585666 2025-12-31 08:31:29 2461040.8551968 18.22 0.05 20.26 ABMag BG-q-BlackGem BG3_BlackGEM-Cam3 60 robotic
BG-q-BlackGem BG2_BlackGEM-Cam2 2025-07-25 23:41:33 - 2025-07-25 23:41:33 2460882.4871875 - 2460882.4871875 1
Photometry
ID Obs-date JD Mag. / Flux Err Lim. Mag./Flux Units Filter Tel / Inst Exp-time Observer/s Remarks
585665 2025-07-25 23:41:33 2460882.4871875 20.16 ABMag BG-q-BlackGem BG2_BlackGEM-Cam2 60 robotic [Last non detection]
w-P1 PS1_GPC1 2026-01-27 15:08:23 - 2026-01-27 15:08:23 2461068.13082 - 2461068.13082 1
Photometry
ID Obs-date JD Mag. / Flux Err Lim. Mag./Flux Units Filter Tel / Inst Exp-time Observer/s Remarks
562928 2026-01-27 15:08:23 2461068.13082 18.3 0.02 22 ABMag w-P1 PS1_GPC1 45 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
305397 2026-05-27 13:49:03 BlackGEM_Bot1 H. Tranin, F. Stoppa, D. Pieterse et al. BlackGEM BlackGEM 13:44:36.136 -29:55:52.58 2025-12-31 08:31:29.000 18.22 BG-q-BlackGem PSN BGEM J134436.14-295552.6 BlackGEM N
293679 2026-03-06 11:34:50 PS1_Bot1 K. C. Chambers, T. de Boer, J. Fairlamb et al. Pan-STARRS Pan-STARRS 13:44:36.132 -29:55:52.58 2026-01-27 15:08:22.848 18.3 w-P1 PSN PS26apw Pan-STARRS N
288273 2026-01-21 18:20:16 GOTO_bot M. Pursiainen, K. Ackley, M. Dyer et al. GOTO GOTO 13:44:36.140 -29:55:52.52 2026-01-21 17:40:53.472 18.73 L-GOTO PSN GOTO26tp GOTO N
280818 2025-12-16 09:18:14 ATLAS_Bot1 J. Tonry, L. Denneau, H. Weiland (IfA, University of Hawaii) et al. ATLAS ATLAS 13:44:36.153 -29:55:52.84 2025-12-16 01:40:40.224 17.962 cyan-ATLAS PSN ATLAS25pul ATLAS 2025TNSTR4997....1T N
Classification Reports
ID Time received (UT) Sender Classifier/s Group Classification Redshift Spectra Related files Assoc. Groups End prop. period Remarks ADS Bibcode
23143 2026-03-07 16:29:43 Priscila Pessi P. Pessi (NCBJ), A. Cikota (NOIRLab/Gemini South), V.Firpo (NOIRLab/Gemini South), L. Magill (NOIRLab/Gemini South), K. Silva (NOIRLab/Gemini South), P. Candia (NOIRLab/Gemini South), S. Panda (NOIRLab/Gemini South), J. Font-Serra (NOIRLab/Gemini South), R. Angeloni (NOIRLab/Gemini South), V. Kalari (NOIRLab/Gemini South), C. Rodriguez (NOIRLab/Gemini South), J.-E. Heo (NOIRLab/Gemini South), E. Sabbi (NOIRLab), R. Cartier (University of Antofagasta), S. Cikota (FER Zagreb, CAHA) None SN II 0.038 1 Best match to phase ~ 80d past peak. Redshift from host as reported in NED (https://ned.ipac.caltech.edu/) . The redshift from spectral matching is estimated to be 0.043, forcing the redshift to that of the host does not change the classification. 2026TNSCR.957....1P
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
23144 2026-03-06 00:00:00 Gemini-S / GMOS-S Gemini None tns_2025ahby_2026-03-06_Gemini-S_GMOS-S_None.txt Object

Comments

TNS
System

Fri, 03/06/2026 - 11:34

Object coordinates updated

Object coordinates updated according to AT-report 293679 of Group Pan-STARRS
Previous RA, DEC: 13:44:36.153, -29:55:52.84 (206.150638889, -29.9313444444)
Updated RA, DEC: 13:44:36.132, -29:55:52.58 (206.150548173, -29.9312735936)