RA/DEC (2000)
03:06:52.208 +42:31:15.46
46.7175321186 +42.520960864
Type
SN Ia
Redshift
0.0178
Discovery ReportClassification Report
Reporting Group
ATLAS
Discovering Data Source
ATLAS
Discovery Date
2025-09-28 01:41:13.056
TNS AT
Y
Public
Y
Discovery Mag
18.016
Filter
wide-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_2025yth - 2025-09-29 22:55:00 Other / Other (None)z=
 ▌SN_2025yth - 2025-09-29 22:55:00 Other / Other (None)z=
 ▌SN_2025yth - 2025-09-29 01:53:00 LT / SPRAT (OxQUB)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

 ▌ATLAS-TDO_ATLAS-05_wide
 ▌GOTO-N_GOTO-2_L
 ▌PS2_GPC2_w
 ▌GOTO-N_GOTO-1_L
 ▌P48_ZTF-Cam_g
 ▌ATLAS-HKO_ATLAS-02_cyan
 ▌PS1_GPC1_i
   
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
22137 2025-09-29 22:55:00 Other / Other 3600 E Soubrouillard E soubrouillard None tns_2025yth_2025-09-29_22-55-00_Other_Other_None_0.dat tns_2025yth_2025-09-29_22-55-00_Other_Other_None_0.fits Object 2025-10-01 Spectrum taken using an ALPY200 grism slit spectrograph (R~130) and a 0.3m aperture telescope
22133 2025-09-29 22:55:00 Other / Other 3600 E Soubrouillard E soubrouillard None tns_2025yth_2025-09-29_22-55-00_Other_Other_None.dat tns_2025yth_2025-09-29_22-55-00_Other_Other_None.fits 2025-10-01 Spectrum taken by Emmanuel Soubrouillard using an ALPY200 grism slit spectrograph (R~130) and a 0.3m aperture telescope
22126 2025-09-29 01:53:00 LT / SPRAT 1800 Robotic OxQUB tns_2025yth_2025-09-29_01-53-00.172_LT_SPRAT_OxQUB.txt Object
Light Curves
Filter Tel / Inst Obs-date range JD Range Photometry
wide-ATLAS ATLAS-TDO_ATLAS-05 2025-09-28 01:41:13 - 2025-09-28 01:41:13 2460946.57029 - 2460946.57029 1
Photometry
ID Obs-date JD Mag. / Flux Err Lim. Mag./Flux Units Filter Tel / Inst Exp-time Observer/s Remarks
520532 2025-09-28 01:41:13 2460946.57029 18.016 0.103 20.2 ABMag wide-ATLAS ATLAS-TDO_ATLAS-05 30 Robot
L-GOTO GOTO-N_GOTO-2 2025-09-28 00:22:35 - 2025-09-28 00:22:35 2460946.51568 - 2460946.51568 1
Photometry
ID Obs-date JD Mag. / Flux Err Lim. Mag./Flux Units Filter Tel / Inst Exp-time Observer/s Remarks
520542 2025-09-28 00:22:35 2460946.51568 18.03 0.05 ABMag L-GOTO GOTO-N_GOTO-2 180
w-P1 PS2_GPC2 2025-10-02 12:52:47 - 2025-10-02 12:52:47 2460951.03666 - 2460951.03666 1
Photometry
ID Obs-date JD Mag. / Flux Err Lim. Mag./Flux Units Filter Tel / Inst Exp-time Observer/s Remarks
522266 2025-10-02 12:52:47 2460951.03666 16.45 0 22 ABMag w-P1 PS2_GPC2 45 Robot
L-GOTO GOTO-N_GOTO-1 2025-09-23 01:03:24 - 2025-09-23 01:03:24 2460941.544033 - 2460941.544033 1
Photometry
ID Obs-date JD Mag. / Flux Err Lim. Mag./Flux Units Filter Tel / Inst Exp-time Observer/s Remarks
520541 2025-09-23 01:03:24 2460941.544033 20.3 ABMag L-GOTO GOTO-N_GOTO-1 360 [Last non detection]
g-ZTF P48_ZTF-Cam 2025-09-24 09:56:46 - 2025-10-09 10:28:12 2460942.9144213 - 2460957.93625 3
Photometry
ID Obs-date JD Mag. / Flux Err Lim. Mag./Flux Units Filter Tel / Inst Exp-time Observer/s Remarks
522637 2025-10-09 10:28:12 2460957.93625 15.7425 0.00634163 ABMag g-ZTF P48_ZTF-Cam
522636 2025-09-25 09:27:25 2460943.8940394 20.4904 0.150783 ABMag g-ZTF P48_ZTF-Cam
522635 2025-09-24 09:56:46 2460942.9144213 20.8821 ABMag g-ZTF P48_ZTF-Cam [Last non detection]
cyan-ATLAS ATLAS-HKO_ATLAS-02 2025-09-26 14:35:10 - 2025-09-26 14:35:10 2460945.10775 - 2460945.10775 1
Photometry
ID Obs-date JD Mag. / Flux Err Lim. Mag./Flux Units Filter Tel / Inst Exp-time Observer/s Remarks
520531 2025-09-26 14:35:10 2460945.10775 18.02 ABMag cyan-ATLAS ATLAS-HKO_ATLAS-02 30 Robot [Last non detection]
i-P1 PS1_GPC1 2025-11-01 09:42:17 - 2025-11-01 09:42:17 2460980.90436 - 2460980.90436 1
Photometry
ID Obs-date JD Mag. / Flux Err Lim. Mag./Flux Units Filter Tel / Inst Exp-time Observer/s Remarks
540275 2025-11-01 09:42:17 2460980.90436 16.49 0.02 20.7 ABMag i-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
281241 2025-12-18 14:44:46 PS1_Bot1 K. C. Chambers, T. de Boer, J. Fairlamb et al. Pan-STARRS Pan-STARRS 03:06:52.208 +42:31:15.46 2025-11-01 09:42:16.704 16.49 i-P1 PSN PS25hsz Pan-STARRS N
272667 2025-10-09 11:24:05 Fritz Jesper Sollerman (SU), Christoffer Fremling (Caltech), Daniel Perley (LJMU) et al. ZTF ZTF 03:06:52.204 +42:31:15.53 2025-09-25 09:27:25.004 20.4904 g-ZTF PSN ZTF25abvajxp ZTF N
272499 2025-10-05 01:40:16 PS1_Bot1 K. C. Chambers, T. de Boer, J. Fairlamb et al. Pan-STARRS Pan-STARRS 03:06:52.208 +42:31:15.40 2025-10-02 12:52:47.424 16.45 w-P1 PSN PS25hsz Pan-STARRS N
271591 2025-09-28 09:15:05 GOTO_bot G. Ramsay, D. O'Neill, K. Ackley et al. GOTO GOTO 03:06:52.202 +42:31:15.43 2025-09-28 00:22:34.752 18.03 L-GOTO Other GOTO25hxn GOTO N
271586 2025-09-28 07:32:43 ATLAS_Bot1 J. Tonry, L. Denneau, H. Weiland et al. ATLAS ATLAS 03:06:52.201 +42:31:15.56 2025-09-28 01:41:13.056 18.016 wide-ATLAS PSN ATLAS25mbk ATLAS 2025TNSTR3893....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
22137 2025-10-01 12:10:33 EMMANUEL SOUBROUILLARD EMMANUEL SOUBROUILLARD None SN Ia 0.0178 1 2025-10-01 SNID ( Blondin, S. & Tonry, J. L. 2007. ApJ, 666, 1024) gives good matches to type 1a supernovae near maximum (1-2 weeks). The redshift from the SNID best match is close to that of the of the probable host Z540-41 -- Galaxy towards a Group of Galaxies (Simbad) 2025TNSCR3970....1S
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
22137 2025-09-29 22:55:00 Other / Other 3600 E Soubrouillard E soubrouillard None tns_2025yth_2025-09-29_22-55-00_Other_Other_None_0.dat tns_2025yth_2025-09-29_22-55-00_Other_Other_None_0.fits Object 2025-10-01 Spectrum taken using an ALPY200 grism slit spectrograph (R~130) and a 0.3m aperture telescope
22133 2025-10-01 10:20:59 EMMANUEL SOUBROUILLARD EMMANUEL SOUBROUILLARD None SN Ia 0.0178 1 2 2025-10-01 SNID ( Blondin, S. & Tonry, J. L. 2007. ApJ, 666, 1024) gives good matches to type 1a supernovae near maximum. The redshift from the SNID best match is close to that of the of the probable host Z540-41 -- Galaxy towards a Group of Galaxies (Simbad) 2025TNSCR3970....1S
Related files
File Comments Last Modified (UT) Modified By
tns_2025yth_atrep_22133.dat 2025-10-01 10:20:59 EMMANUEL SOUBROUILLARD
tns_2025yth_atrep_22133.fits 2025-10-01 10:20:59 EMMANUEL SOUBROUILLARD
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
22133 2025-09-29 22:55:00 Other / Other 3600 E Soubrouillard E soubrouillard None tns_2025yth_2025-09-29_22-55-00_Other_Other_None.dat tns_2025yth_2025-09-29_22-55-00_Other_Other_None.fits 2025-10-01 Spectrum taken by Emmanuel Soubrouillard using an ALPY200 grism slit spectrograph (R~130) and a 0.3m aperture telescope
22126 2025-09-30 12:48:21 Shubham Srivastav S. Srivastav (Oxford), M. Fulton, M. Nicholl, C. R. Angus, K. W. Smith, D. R. Young, A. Aamer, D. Magill, T. Moore, X. Sheng, S. A. Sim (QUB), S. J. Smartt (Oxford/QUB), J. H. Gillanders, H. F. Stevance, F. Stoppa (Oxford), T.-W. Chen (NCU) OxQUB SN Ia 0.018 1 ATLAS, OxQUB Young SN Ia. SNID-SAGE* shows good matches with normal SNe Ia around 2 weeks before maximum. Known host galaxy redshift from NED. *SNID-SAGE is an enhanced python version of SNID, Stoppa et al. in prep (https://github.com/FiorenSt/SNID-SAGE) 2025TNSCR3937....1S
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
22126 2025-09-29 01:53:00 LT / SPRAT 1800 Robotic OxQUB tns_2025yth_2025-09-29_01-53-00.172_LT_SPRAT_OxQUB.txt Object

Comments

TNS
System

Thu, 12/18/2025 - 14:44

Object coordinates updated

Object coordinates updated according to AT-report 281241 of Group Pan-STARRS
Previous RA, DEC: 03:06:52.208, +42:31:15.40 (46.71753328, +42.5209440823)
Updated RA, DEC: 03:06:52.208, +42:31:15.46 (46.7175321186, +42.520960864)

TNS
System

Sun, 10/05/2025 - 01:40

Object coordinates updated

Object coordinates updated according to AT-report 272499 of Group Pan-STARRS
Previous RA, DEC: 03:06:52.201, +42:31:15.56 (46.717505, +42.52099)
Updated RA, DEC: 03:06:52.208, +42:31:15.40 (46.71753328, +42.5209440823)

EMMANUEL
SOUBROUILLARD

Wed, 10/01/2025 - 07:17

sn2025yth

SNID ( Blondin, S. & Tonry, J. L. 2007. ApJ, 666, 1024) gives good matches to type 1a supernovae near maximum. The redshift from the SNID best match is close to that of the of the probable host Z540-41 -- Galaxy towards a Group of Galaxies (Simbad)

Spectrum taken by Emmanuel Soubrouillard using an ALPY200 grism slit spectrograph (R~130) and a 0.3m aperture telescope

sn2025yth_20250929_2255utc_esou_OPF.dat