RA/DEC (2000)
03:37:01.451 -34:55:53.20
54.256046 -34.931444
Type
SN Ia
Redshift
0.0636
Discovery ReportClassification Report
Reporting Group
ATLAS
Discovering Data Source
ATLAS
Discovery Date
2025-10-12 05:18:59.328
TNS AT
Y
Public
Y
Discovery Mag
18.757
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), 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_2025aalx - 2025-10-21 00:00:00 Other / Other (BlackGEM)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
 ▌ATLAS-STH_ATLAS-03_orange
 ▌BG2_BlackGEM-Cam2_BG-q
   
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
22356 2025-10-21 00:00:00 Other / Other 3600 Lloyd Landsberg Lloyd Landsberg BlackGEM tns_2025aalx_2025-10-21_Other_Other_BlackGEM.csv tns_2025aalx_2025-10-21_Other_Other_BlackGEM.fits Object Spectrum was taken with the SAAO 1.9m using grating 7 with a resolution of 300 lines per mm set at an angle of 16.
Light Curves
Filter Tel / Inst Obs-date range JD Range Photometry
L-GOTO GOTO-S_GOTO-4 2025-10-02 14:05:41 - 2025-10-20 15:37:12 2460951.087277 - 2460969.150835 2
Photometry
ID Obs-date JD Mag. / Flux Err Lim. Mag./Flux Units Filter Tel / Inst Exp-time Observer/s Remarks
526245 2025-10-20 15:37:12 2460969.150835 18.37 0.05 ABMag L-GOTO GOTO-S_GOTO-4 180
526244 2025-10-02 14:05:41 2460951.087277 19.5 ABMag L-GOTO GOTO-S_GOTO-4 180 [Last non detection]
orange-ATLAS ATLAS-CHL_ATLAS-04 2025-10-12 05:18:59 - 2025-10-12 05:18:59 2460960.72152 - 2460960.72152 1
Photometry
ID Obs-date JD Mag. / Flux Err Lim. Mag./Flux Units Filter Tel / Inst Exp-time Observer/s Remarks
523857 2025-10-12 05:18:59 2460960.72152 18.757 0.424 19.05 ABMag orange-ATLAS ATLAS-CHL_ATLAS-04 30 Robot
orange-ATLAS ATLAS-STH_ATLAS-03 2025-10-10 23:25:46 - 2025-10-10 23:25:46 2460959.47623 - 2460959.47623 1
Photometry
ID Obs-date JD Mag. / Flux Err Lim. Mag./Flux Units Filter Tel / Inst Exp-time Observer/s Remarks
523856 2025-10-10 23:25:46 2460959.47623 18.49 ABMag orange-ATLAS ATLAS-STH_ATLAS-03 30 Robot [Last non detection]
BG-q-BlackGem BG2_BlackGEM-Cam2 2025-10-16 02:48:32 - 2025-10-16 07:36:18 2460964.617037 - 2460964.816875 2
Photometry
ID Obs-date JD Mag. / Flux Err Lim. Mag./Flux Units Filter Tel / Inst Exp-time Observer/s Remarks
524437 2025-10-16 07:36:18 2460964.816875 18.36 0.06 20.59 ABMag BG-q-BlackGem BG2_BlackGEM-Cam2 60 robotic
524436 2025-10-16 02:48:32 2460964.617037 20.21 ABMag BG-q-BlackGem BG2_BlackGEM-Cam2 60 robotic [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
274523 2025-10-23 15:18:47 GOTO_bot G. Ramsay,D. O'Neill,K. Ackley et al. GOTO GOTO 03:37:01.458 -34:55:53.79 2025-10-20 15:37:11.712 18.37 L-GOTO Other GOTO25iuv GOTO N
273708 2025-10-17 18:14:02 BlackGEM_Bot1 H. Tranin,F. Stoppa,D. Pieterse et al. BlackGEM BlackGEM 03:37:01.451 -34:55:53.20 2025-10-16 07:36:18.000 18.36 BG-q-BlackGem PSN BGEM J033701.45-345553.2 BlackGEM N
273361 2025-10-14 23:30:22 ATLAS_Bot1 J. Tonry,L. Denneau,H. Weiland et al. ATLAS ATLAS 03:37:01.441 -34:55:53.83 2025-10-12 05:18:59.328 18.757 orange-ATLAS PSN ATLAS25mpa ATLAS 2025TNSTR4112....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
22355 2025-11-05 13:49:36 Lloyd Landsberg Lloyd Landsberg (UCT/SAAO), Moses Mlangeni (UCT/SAAO), Francois Campher (UCT/SAAO), Orapoleng Mogawana (UCT/SAAO), Erez Zimmerman (Weizmann), Paul Groot (Radboud/UCT/SAAO), Fiorenzo Stoppa (Oxford), Hugo Tranin (Barcelona) BlackGEM SN Ia 0.0636 1 BlackGEM, MeerLICHT We obtained an optical spectrum of AT2025aalx on 2025-10-21 22:10:35 UTC using the SAAO 1.9-m telescope at the South African Astronomical Observatory (SAAO) equipped with the SpUpNIC spectrograph. The data were reduced using standard procedures with Pyraf v2.1.15, and the resulting spectrum was analysed with the SNID-SAGE classification tool. The object was classified as a normal Type Ia supernova (SN Ia-norm). The spectrum shows the characteristic broad Si II λ6465 absorption feature near 6150 Å (rest frame), consistent with a normal SN Ia at an early phase. The target is unclassified, so we adopt a best-fit redshift of z=0.0636(11). 2025TNSCR4451....1L
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
22356 2025-10-21 00:00:00 Other / Other 3600 Lloyd Landsberg Lloyd Landsberg BlackGEM tns_2025aalx_2025-10-21_Other_Other_BlackGEM.csv tns_2025aalx_2025-10-21_Other_Other_BlackGEM.fits Object Spectrum was taken with the SAAO 1.9m using grating 7 with a resolution of 300 lines per mm set at an angle of 16.

Comments

TNS
System

Fri, 10/17/2025 - 18:14

Object coordinates updated

Object coordinates updated according to AT-report 273708 of Group BlackGEM
Previous RA, DEC: 03:37:01.441, -34:55:53.83 (54.2560057692, -34.93162)
Updated RA, DEC: 03:37:01.451, -34:55:53.20 (54.256046, -34.931444)