RA/DEC (2000)
17:29:34.194 -64:01:33.84
262.392474444 -64.0260677778
Type
SN II
Redshift
0.0175
Discovery ReportClassification Report
Reporting Group
ATLAS
Discovering Data Source
ATLAS
Discovery Date
2025-09-25 00:00:17.280
TNS AT
Y
Public
Y
Discovery Mag
17.408
Filter
cyan-ATLAS
Reporter/s
J. Tonry, L. Denneau, H. Weiland, R. Siverd (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 (QUB), P. Ramsden (Birmingham/QUB), L. Shingles (GSI/QUB), S. Srivastav, J. H. Gillanders, H. Stevance, A. J. Cooper, F. Stoppa, J. Tweddle (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_2025ymy - 2025-10-04 10:09:24 ANU-2.3m / WiFeS (Supernova Alliance)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-CHL_ATLAS-04_cyan
 ▌ATLAS-STH_ATLAS-03_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
22158 2025-10-04 10:09:24 ANU-2.3m / WiFeS B Schmidt C Lidman Supernova Alliance tns_2025ymy_2025-10-04_10-09-24_ANU-2.3m_WiFeS_Supernova_Alliance.dat Object
Light Curves
Filter Tel / Inst Obs-date range JD Range Photometry
L-GOTO GOTO-S_GOTO-4 2025-08-31 12:46:35 - 2025-09-27 09:50:09 2460919.032345 - 2460945.909831 2
Photometry
ID Obs-date JD Mag. / Flux Err Lim. Mag./Flux Units Filter Tel / Inst Exp-time Observer/s Remarks
520442 2025-09-27 09:50:09 2460945.909831 17.34 0.07 ABMag L-GOTO GOTO-S_GOTO-4 180
520441 2025-08-31 12:46:35 2460919.032345 18.5 ABMag L-GOTO GOTO-S_GOTO-4 180 [Last non detection]
cyan-ATLAS ATLAS-CHL_ATLAS-04 2025-09-25 00:00:17 - 2025-09-25 00:00:17 2460943.5002 - 2460943.5002 1
Photometry
ID Obs-date JD Mag. / Flux Err Lim. Mag./Flux Units Filter Tel / Inst Exp-time Observer/s Remarks
519874 2025-09-25 00:00:17 2460943.5002 17.408 0.062 19.13 ABMag cyan-ATLAS ATLAS-CHL_ATLAS-04 30 Robot
orange-ATLAS ATLAS-STH_ATLAS-03 2025-09-23 18:58:15 - 2025-09-23 18:58:15 2460942.29045 - 2460942.29045 1
Photometry
ID Obs-date JD Mag. / Flux Err Lim. Mag./Flux Units Filter Tel / Inst Exp-time Observer/s Remarks
519873 2025-09-23 18:58:15 2460942.29045 16.69 ABMag orange-ATLAS ATLAS-STH_ATLAS-03 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
271533 2025-09-27 15:16:21 GOTO_bot G. Ramsay,D. O'Neill,K. Ackley et al. GOTO GOTO 17:29:34.212 -64:01:34.13 2025-09-27 09:50:09.312 17.34 L-GOTO Other GOTO25hvq GOTO N
271273 2025-09-25 07:45:41 ATLAS_Bot1 J. Tonry,L. Denneau,H. Weiland et al. ATLAS ATLAS 17:29:34.194 -64:01:33.84 2025-09-25 00:00:17.280 17.408 cyan-ATLAS PSN ATLAS25lwq ATLAS 2025TNSTR3855....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
22158 2025-10-05 21:46:53 Brian Schmidt B. Schmidt (ANU), K. Auchettl (University of Melbourne/UCSC), C. Lidman (ANU), B. Martin (ANU), Anais Moller (Swinburne), L. Rauf (ANU), Sara Romagnoli (University of Melbourne), Jennifer Shi (University of Melbourne), and B. E. Tucker (ANU) Supernova Alliance SN II 0.0175 1 Supernova Alliance young SN II similar to 1999em at 1 week post explosion 2025TNSCR4015....1S
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
22158 2025-10-04 10:09:24 ANU-2.3m / WiFeS B Schmidt C Lidman Supernova Alliance tns_2025ymy_2025-10-04_10-09-24_ANU-2.3m_WiFeS_Supernova_Alliance.dat Object

Comments