RA/DEC (2000)
12:57:28.318 -28:12:06.79
194.367991667 -28.2018866667
Type
SN Ia
Redshift
0.016221
Discovery ReportClassification Report
Related AstroNotes: 2025-85
Reporting Group
ATLAS
Discovering Data Source
ATLAS
Discovery Date
2025-03-12 04:53:45.600
TNS AT
Y
Public
Y
Discovery Mag
17.784
Filter
orange-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), 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 (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_2025efa - 2025-03-13 11:13:08 FTN / FLOYDS-N (None)z=
 ▌SN_2025efa - 2025-03-13 11:13:08 FTN / FLOYDS-N (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-CHL_ATLAS-04_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
20572 2025-03-13 11:13:08 FTN / FLOYDS-N 2700 LCO Moira Andrews None tns_2025efa_2025-03-13_11-13-08_FTN_FLOYDS-N_None.txt Object
20568 2025-03-13 11:13:08 FTN / FLOYDS-N 2700 LCO Moira Andrews None tns_2025efa_2025-03-13_11-13-08_FTN_FLOYDS-N_None.ascii Object
Light Curves
Filter Tel / Inst Obs-date range JD Range Photometry
L-GOTO GOTO-S_GOTO-4 2025-03-01 12:28:11 - 2025-03-13 15:12:58 2460736.019575 - 2460748.134012 2
Photometry
ID Obs-date JD Mag. / Flux Err Lim. Mag./Flux Units Filter Tel / Inst Exp-time Observer/s Remarks
475175 2025-03-13 15:12:58 2460748.134012 17.77 0.08 ABMag L-GOTO GOTO-S_GOTO-4 180
475174 2025-03-01 12:28:11 2460736.019575 19.8 ABMag L-GOTO GOTO-S_GOTO-4 135 [Last non detection]
orange-ATLAS ATLAS-CHL_ATLAS-04 2025-03-11 05:17:28 - 2025-03-12 04:53:46 2460745.72046 - 2460746.704 2
Photometry
ID Obs-date JD Mag. / Flux Err Lim. Mag./Flux Units Filter Tel / Inst Exp-time Observer/s Remarks
475131 2025-03-12 04:53:46 2460746.704 17.784 0.117 18.56 ABMag orange-ATLAS ATLAS-CHL_ATLAS-04 30 Robot
475130 2025-03-11 05:17:28 2460745.72046 18.8 ABMag orange-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 Bibcode Unreal Auto classification
247827 2025-03-13 19:50:15 GOTO_bot D. O'Neill,K. Ackley,M. Dyer et al. GOTO GOTO 12:57:28.322 -28:12:07.05 2025-03-13 15:12:58.464 17.77 L-GOTO Other GOTO25bap GOTO N
247800 2025-03-12 16:01:42 ATLAS_Bot1 J. Tonry,L. Denneau,H. Weiland et al. ATLAS ATLAS 12:57:28.318 -28:12:06.79 2025-03-12 04:53:45.600 17.784 orange-ATLAS PSN ATLAS25cqi ATLAS 2025TNSTR.963....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
20572 2025-03-14 19:01:49 Moira Andrews Moira Andrews (UCSB/LCO), Joseph Farah, D. Andrew Howell, Curtis McCully None SN Ia 0.016221 1 We report the classification of SN 2025efa as an early SN Ia. The spectrum shows a best match to Ia norm SN 1994ae from SNID (Blondin & Tonry 2007, ApJ, 666, 1024). The absolute magnitude and photometric evolution indicates a Type Ia supernova discovered 10-15 days before peak. The object redshift is acquired from the nearby host of ESO 443- G 016 (z=0.016221, value from NED). Additional follow-up is encouraged. 2025TNSCR.991....1A
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
20572 2025-03-13 11:13:08 FTN / FLOYDS-N 2700 LCO Moira Andrews None tns_2025efa_2025-03-13_11-13-08_FTN_FLOYDS-N_None.txt Object
20568 2025-03-13 17:29:47 Moira Andrews Moira Andrews (UCSB/LCO), Joseph Farah (UCSB/LCO), D. Andrew Howell (UCSB/LCO), Curtis McCully (UCSB/LCO) None SN Ia 0.016221 1 We report the classification of SN 2025efa as SN Ia. The spectrum shows a best match to Ia norm SN 1994ae from SNID (Blondin & Tonry 2007, ApJ, 666, 1024) 8 days post peak, with other close matches to SN Ia around or after peak. The object redshift is acquired from the nearby host of ESO 443- G 016 (z=0.016221, value from NED). Additional follow-up is encouraged. 2025TNSCR.977....1A
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
20568 2025-03-13 11:13:08 FTN / FLOYDS-N 2700 LCO Moira Andrews None tns_2025efa_2025-03-13_11-13-08_FTN_FLOYDS-N_None.ascii Object

Comments