RA/DEC (2000)
05:51:23.643 -50:35:06.78
87.848512 -50.585217
Type
SN Ia
Redshift
0.02332
Discovery ReportClassification Report
Reporting Group
GOTO
Discovering Data Source
GOTO
Discovery Date
2025-09-14 18:30:09.216
TNS AT
Y
Public
Y
Discovery Mag
19.05
Filter
L-GOTO
Reporter/s
D. O'Neill, K. Ackley, M. Dyer, J. Lyman, K. Ulaczyk, D. Steeghs, D. Galloway, V. Dhillon, P. O'Brien, G. Ramsay, K. Noysena, R. Kotak, R. Breton, J. Casares, L. Nuttall, B. Godson, T. Killestein, A. Kumar, M. Pursiainen, on behalf of GOTO collaboration
NEDSIMBADDECaLSPanSTARRS-1SkyMapperVizieRWISEDSSADS

Spectra

 ▌SN_2025xmp - 2025-10-01 00:12:39 Lesedi / Mookodi (SAAO IO)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
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▌Show N II at z=vexp= km/s
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▌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
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▌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
 ▌GOTO-S_GOTO-3_L
 ▌ATLAS-CHL_ATLAS-04_orange
 ▌ATLAS-STH_ATLAS-03_orange
 ▌BG3_BlackGEM-Cam3_BG-q
 ▌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
22131 2025-10-01 00:12:39 Lesedi / Mookodi 600 N. Erasmus, S. Potter, C. van Gend, H. Worters, P. Rabe (all SAAO) N. Erasmus, D. Cunnama, S. Potter (all SAAO) SAAO IO tns_AT_2025xmp_2025-10-01_00-12-39_Lesedi_Mookodi_SAAO_IO.flm Object The spectrum was taken with the SAAO's 1-m Lesedi robotic telescope with the Mookodi low-resolution spectrograph and imager as part of the SAAO’s "Intelligent Observatory" rapid follow-up program. The spectrum was taken with the widest (4") slit width which resulted in a spectral resolution of R ~ 200 at 6000 Angstrom.
Light Curves
Filter Tel / Inst Obs-date range JD Range Photometry
L-GOTO GOTO-S_GOTO-4 2025-09-14 18:30:09 - 2025-09-14 18:30:09 2460933.270944 - 2460933.270944 1
Photometry
ID Obs-date JD Mag. / Flux Err Lim. Mag./Flux Units Filter Tel / Inst Exp-time Observer/s Remarks
517189 2025-09-14 18:30:09 2460933.270944 19.05 0.12 ABMag L-GOTO GOTO-S_GOTO-4 180
L-GOTO GOTO-S_GOTO-3 2025-09-12 18:58:56 - 2025-09-12 18:58:56 2460931.290935 - 2460931.290935 1
Photometry
ID Obs-date JD Mag. / Flux Err Lim. Mag./Flux Units Filter Tel / Inst Exp-time Observer/s Remarks
517188 2025-09-12 18:58:56 2460931.290935 20 ABMag L-GOTO GOTO-S_GOTO-3 360 [Last non detection]
orange-ATLAS ATLAS-CHL_ATLAS-04 2025-09-16 08:03:50 - 2025-09-16 08:03:50 2460934.836 - 2460934.836 1
Photometry
ID Obs-date JD Mag. / Flux Err Lim. Mag./Flux Units Filter Tel / Inst Exp-time Observer/s Remarks
518363 2025-09-16 08:03:50 2460934.836 18.068 0.084 19.19 ABMag orange-ATLAS ATLAS-CHL_ATLAS-04 30 Robot
orange-ATLAS ATLAS-STH_ATLAS-03 2025-09-15 03:37:54 - 2025-09-15 03:37:54 2460933.65132 - 2460933.65132 1
Photometry
ID Obs-date JD Mag. / Flux Err Lim. Mag./Flux Units Filter Tel / Inst Exp-time Observer/s Remarks
518362 2025-09-15 03:37:54 2460933.65132 18.2 ABMag orange-ATLAS ATLAS-STH_ATLAS-03 30 Robot [Last non detection]
BG-q-BlackGem BG3_BlackGEM-Cam3 2025-11-13 03:47:15 - 2025-11-13 03:47:15 2460992.6578125 - 2460992.6578125 1
Photometry
ID Obs-date JD Mag. / Flux Err Lim. Mag./Flux Units Filter Tel / Inst Exp-time Observer/s Remarks
587445 2025-11-13 03:47:15 2460992.6578125 20.43 ABMag BG-q-BlackGem BG3_BlackGEM-Cam3 60 robotic [Last non detection]
BG-q-BlackGem BG2_BlackGEM-Cam2 2025-11-14 03:02:04 - 2025-11-14 03:02:04 2460993.6264352 - 2460993.6264352 1
Photometry
ID Obs-date JD Mag. / Flux Err Lim. Mag./Flux Units Filter Tel / Inst Exp-time Observer/s Remarks
587446 2025-11-14 03:02:04 2460993.6264352 18.67 0.07 20.11 ABMag BG-q-BlackGem BG2_BlackGEM-Cam2 60 robotic
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
306287 2026-05-27 17:44:22 BlackGEM_Bot1 H. Tranin, F. Stoppa, D. Pieterse et al. BlackGEM BlackGEM 05:51:23.643 -50:35:06.78 2025-11-14 03:02:04.000 18.67 BG-q-BlackGem PSN BGEM J055123.64-503506.8 BlackGEM N
270587 2025-09-18 17:11:10 ATLAS_Bot1 J. Tonry, L. Denneau, H. Weiland et al. ATLAS ATLAS 05:51:23.643 -50:35:06.63 2025-09-16 08:03:50.400 18.068 orange-ATLAS PSN ATLAS25lpr ATLAS N
270075 2025-09-14 22:41:19 GOTO_bot D. O'Neill, K. Ackley, M. Dyer et al. GOTO GOTO 05:51:23.628 -50:35:07.12 2025-09-14 18:30:09.216 19.05 L-GOTO Other GOTO25hbp GOTO 2025TNSTR3687....1O N
Classification Reports
ID Time received (UT) Sender Classifier/s Group Classification Redshift Spectra Related files Assoc. Groups End prop. period Remarks ADS Bibcode
22131 2025-10-01 00:59:22 io robot N. Erasmus, D. Cunnama, S. Potter (all South African Astronomical Observatory) SAAO IO SN Ia 0.02332 1 1 SAAO IO Spectral template matching using SNID SAGE shows a good match with a Type Ia supernova.The reported redshift is derived from published values of the likely host galaxy. The SNID SAGE fit also estimated a similar redshift. 2025TNSCR3957....1E
Related files
File Comments Last Modified (UT) Modified By
tns_2025xmp_atrep_22131_SAAO_IO.png The plot shows the best-fit from SNID SAGE (Stoppa, in prep, 2025). 2025-10-01 00:59:22 io robot
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
22131 2025-10-01 00:12:39 Lesedi / Mookodi 600 N. Erasmus, S. Potter, C. van Gend, H. Worters, P. Rabe (all SAAO) N. Erasmus, D. Cunnama, S. Potter (all SAAO) SAAO IO tns_AT_2025xmp_2025-10-01_00-12-39_Lesedi_Mookodi_SAAO_IO.flm Object The spectrum was taken with the SAAO's 1-m Lesedi robotic telescope with the Mookodi low-resolution spectrograph and imager as part of the SAAO’s "Intelligent Observatory" rapid follow-up program. The spectrum was taken with the widest (4") slit width which resulted in a spectral resolution of R ~ 200 at 6000 Angstrom.

Comments

TNS
System

Wed, 05/27/2026 - 17:44

Object coordinates updated

Object coordinates updated according to AT-report 306287 of Group BlackGEM
Previous RA, DEC: 05:51:23.643, -50:35:06.63 (87.8485132143, -50.5851742857)
Updated RA, DEC: 05:51:23.643, -50:35:06.78 (87.848512, -50.585217)

TNS
System

Thu, 09/18/2025 - 17:11

Object coordinates updated

Object coordinates updated according to AT-report 270587 of Group ATLAS
Previous RA, DEC: 05:51:23.628, -50:35:07.12 (87.848449, -50.585312)
Updated RA, DEC: 05:51:23.643, -50:35:06.63 (87.8485132143, -50.5851742857)