RA/DEC (2000)
01:21:19.998 -34:03:34.37
20.3333259271 -34.0595473137
Type
SN II
Redshift
0.012902
Discovery ReportClassification Report
Reporting Group
ATLAS
Discovering Data Source
ATLAS
Discovery Date
2025-09-24 03:32:35.232
TNS AT
Y
Public
Y
Discovery Mag
17.827
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_2025yjt - 2025-09-25 11:13:29 UH88 / SNIFS (SCAT)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
 ▌BG3_BlackGEM-Cam3_BG-q
 ▌BG2_BlackGEM-Cam2_BG-q
 ▌PS1_GPC1_w
   
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
22101 2025-09-25 11:13:29 UH88 / SNIFS 1800 Hinkle SCAT tns_2025yjt_2025-09-25_11-13-29_UH88_SNIFS_SCAT.dat Object
Light Curves
Filter Tel / Inst Obs-date range JD Range Photometry
L-GOTO GOTO-S_GOTO-4 2025-09-15 14:25:26 - 2025-09-17 12:40:21 2460934.100994 - 2460936.028021 2
Photometry
ID Obs-date JD Mag. / Flux Err Lim. Mag./Flux Units Filter Tel / Inst Exp-time Observer/s Remarks
520492 2025-09-17 12:40:21 2460936.028021 19.97 0.19 ABMag L-GOTO GOTO-S_GOTO-4 360
520491 2025-09-15 14:25:26 2460934.100994 20 ABMag L-GOTO GOTO-S_GOTO-4 180 [Last non detection]
cyan-ATLAS ATLAS-CHL_ATLAS-04 2025-09-24 03:32:35 - 2025-09-24 03:32:35 2460942.64763 - 2460942.64763 1
Photometry
ID Obs-date JD Mag. / Flux Err Lim. Mag./Flux Units Filter Tel / Inst Exp-time Observer/s Remarks
519527 2025-09-24 03:32:35 2460942.64763 17.827 0.07 19.37 ABMag cyan-ATLAS ATLAS-CHL_ATLAS-04 30 Robot
orange-ATLAS ATLAS-STH_ATLAS-03 2025-09-22 22:44:03 - 2025-09-22 22:44:03 2460941.44726 - 2460941.44726 1
Photometry
ID Obs-date JD Mag. / Flux Err Lim. Mag./Flux Units Filter Tel / Inst Exp-time Observer/s Remarks
519526 2025-09-22 22:44:03 2460941.44726 19.63 ABMag orange-ATLAS ATLAS-STH_ATLAS-03 30 Robot [Last non detection]
BG-q-BlackGem BG3_BlackGEM-Cam3 2025-09-24 02:27:31 - 2025-09-24 02:27:31 2460942.6024421 - 2460942.6024421 1
Photometry
ID Obs-date JD Mag. / Flux Err Lim. Mag./Flux Units Filter Tel / Inst Exp-time Observer/s Remarks
519529 2025-09-24 02:27:31 2460942.6024421 18.04 0.06 20.54 ABMag BG-q-BlackGem BG3_BlackGEM-Cam3 60 robotic
BG-q-BlackGem BG2_BlackGEM-Cam2 2025-09-23 06:22:36 - 2025-09-23 06:22:36 2460941.7656944 - 2460941.7656944 1
Photometry
ID Obs-date JD Mag. / Flux Err Lim. Mag./Flux Units Filter Tel / Inst Exp-time Observer/s Remarks
519528 2025-09-23 06:22:36 2460941.7656944 20.64 ABMag BG-q-BlackGem BG2_BlackGEM-Cam2 60 robotic [Last non detection]
w-P1 PS1_GPC1 2025-09-17 12:09:40 - 2025-09-17 12:09:40 2460936.00671 - 2460936.00671 1
Photometry
ID Obs-date JD Mag. / Flux Err Lim. Mag./Flux Units Filter Tel / Inst Exp-time Observer/s Remarks
522688 2025-09-17 12:09:40 2460936.00671 19.67 0.07 22 ABMag w-P1 PS1_GPC1 45 Robot
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
272696 2025-10-10 10:30:14 PS1_Bot1 K. C. Chambers, T. de Boer, J. Fairlamb et al. Pan-STARRS Pan-STARRS 01:21:19.998 -34:03:34.37 2025-09-17 12:09:39.744 19.67 w-P1 PSN PS25htw Pan-STARRS N
271566 2025-09-27 21:38:49 GOTO_bot S. Belkin, D. O'Neill, K. Ackley et al. GOTO GOTO 01:21:19.957 -34:03:34.21 2025-09-17 12:40:20.928 19.97 L-GOTO Other GOTO25hqe GOTO N
271131 2025-09-24 08:36:01 BlackGEM_Bot1 P. Groot, H. Tranin, F. Stoppa et al. BlackGEM BlackGEM 01:21:19.971 -34:03:34.32 2025-09-24 02:27:31.000 18.04 BG-q-BlackGem PSN BGEM J012119.97-340334.3 BlackGEM N
271130 2025-09-24 08:21:32 ATLAS_Bot1 J. Tonry, L. Denneau, H. Weiland et al. ATLAS ATLAS 01:21:19.983 -34:03:34.12 2025-09-24 03:32:35.232 17.827 cyan-ATLAS PSN ATLAS25lvy ATLAS 2025TNSTR3842....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
22101 2025-09-25 14:35:47 Jason Hinkle Jason Hinkle (UIUC) on behalf of SCAT SCAT SN II 0.012902 1 SCAT Redshift from archival 6dF spectrum on NED. Strong blue continuum suggests a young SN II. 2025TNSCR3867....1H
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
22101 2025-09-25 11:13:29 UH88 / SNIFS 1800 Hinkle SCAT tns_2025yjt_2025-09-25_11-13-29_UH88_SNIFS_SCAT.dat Object

Comments

TNS
System

Fri, 10/10/2025 - 10:30

Object coordinates updated

Object coordinates updated according to AT-report 272696 of Group Pan-STARRS
Previous RA, DEC: 01:21:19.971, -34:03:34.32 (20.333212, -34.059533)
Updated RA, DEC: 01:21:19.998, -34:03:34.37 (20.3333259271, -34.0595473137)

TNS
System

Wed, 09/24/2025 - 08:36

Object coordinates updated

Object coordinates updated according to AT-report 271131 of Group BlackGEM
Previous RA, DEC: 01:21:19.983, -34:03:34.12 (20.3332613333, -34.0594766667)
Updated RA, DEC: 01:21:19.971, -34:03:34.32 (20.333212, -34.059533)