RA/DEC (2000)
06:44:20.302 -63:43:32.80
101.08459 -63.7257766667
Type
SN Ia
Redshift
Discovery ReportClassification Report
Related AstroNotes: 2025-291
Reporting Group
ATLAS
Discovering Data Source
ATLAS
Discovery Date
2025-09-23 07:42:57.600
TNS AT
Y
Public
Y
Discovery Mag
19.259
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_2025yii - 2025-09-24 00:00:00 SOAR / Goodman (PASSTA)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),

Light curves

 ▌GOTO-S_GOTO-4_L
 ▌ATLAS-CHL_ATLAS-04_cyan
   
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
22094 2025-09-24 00:00:00 SOAR / Goodman C. Ransome Aravind P. Ravi PASSTA tns_2025yii_2025-09-24_SOAR_Goodman_PASSTA.ascii tns_2025yii_2025-09-24_SOAR_Goodman_PASSTA.fits Object Using SNID (Blondin & Tonry 2007, ApJ, 666, 1024) and SNID-SAGE (Stoppa 2025), we find several good matches to a normal SN Ia, a few days before maximum (e.g., SN 2006gr at z ~0.098 and -2.1d from maximum). This redshift is larger than NGC 2297 (49 Mpc) suggesting this is likely a background source not associated with the host.
Light Curves
Filter Tel / Inst Obs-date range JD Range Photometry
L-GOTO GOTO-S_GOTO-4 2025-09-02 18:30:44 - 2025-09-24 18:25:37 2460921.271338 - 2460943.267794 2
Photometry
ID Obs-date JD Mag. / Flux Err Lim. Mag./Flux Units Filter Tel / Inst Exp-time Observer/s Remarks
520350 2025-09-24 18:25:37 2460943.267794 19.47 0.15 ABMag L-GOTO GOTO-S_GOTO-4 360
520349 2025-09-02 18:30:44 2460921.271338 19.7 ABMag L-GOTO GOTO-S_GOTO-4 180 [Last non detection]
cyan-ATLAS ATLAS-CHL_ATLAS-04 2025-09-22 09:36:01 - 2025-09-23 07:42:58 2460940.90001 - 2460941.8215 2
Photometry
ID Obs-date JD Mag. / Flux Err Lim. Mag./Flux Units Filter Tel / Inst Exp-time Observer/s Remarks
519332 2025-09-23 07:42:58 2460941.8215 19.259 0.199 19.24 ABMag cyan-ATLAS ATLAS-CHL_ATLAS-04 30 Robot
519331 2025-09-22 09:36:01 2460940.90001 18.83 ABMag cyan-ATLAS ATLAS-CHL_ATLAS-04 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
271485 2025-09-26 21:59:59 GOTO_bot D. O'Neill,K. Ackley,M. Dyer et al. GOTO GOTO 06:44:20.379 -63:43:32.79 2025-09-24 18:25:37.056 19.47 L-GOTO Other GOTO25hqi GOTO N
271028 2025-09-23 14:45:03 ATLAS_Bot1 J. Tonry,L. Denneau,H. Weiland et al. ATLAS ATLAS 06:44:20.302 -63:43:32.80 2025-09-23 07:42:57.600 19.259 cyan-ATLAS PSN ATLAS25lvv ATLAS 2025TNSTR3817....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
22094 2025-09-24 09:25:49 Aravind Pazhayath Ravi Aravind P. Ravi (UC Davis), Bhagya Subrayan (U of Arizona), Conor Ransome (U of Arizona), and Griffin Hosseinzadeh (UC San Diego) on behalf of PASSTA PASSTA SN Ia 1 1 PASSTA Using SNID (Blondin & Tonry 2007, ApJ, 666, 1024) and SNID-SAGE (Stoppa 2025), we find several good matches to a normal SN Ia, a few days before maximum (e.g., SN 2006gr at z ~0.098 and -2.1d from maximum). This redshift is larger than NGC 2297 (49 Mpc) suggesting this is a background source not associated with the host. 2025TNSCR3851....1R
Related files
File Comments Last Modified (UT) Modified By
tns_2025yii_atrep_22094_PASSTA.png 2025-09-24 09:25:50 Aravind Pazhayath Ravi
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
22094 2025-09-24 00:00:00 SOAR / Goodman C. Ransome Aravind P. Ravi PASSTA tns_2025yii_2025-09-24_SOAR_Goodman_PASSTA.ascii tns_2025yii_2025-09-24_SOAR_Goodman_PASSTA.fits Object Using SNID (Blondin & Tonry 2007, ApJ, 666, 1024) and SNID-SAGE (Stoppa 2025), we find several good matches to a normal SN Ia, a few days before maximum (e.g., SN 2006gr at z ~0.098 and -2.1d from maximum). This redshift is larger than NGC 2297 (49 Mpc) suggesting this is likely a background source not associated with the host.

Comments