RA/DEC (2000)
20:55:52.772 +15:27:42.49
313.9698835 +15.4618027
Type
SN Ia
Redshift
0.041
Discovery ReportClassification Report
Related AstroNotes: 2025-269
Reporting Group
ZTF
Discovering Data Source
ZTF
Discovery Date
2025-06-29 08:13:47.000
TNS AT
Y
Public
Y
Discovery Mag
19.4414
Filter
r-ZTF
Reporter/s
Jesper Sollerman (SU), Christoffer Fremling (Caltech), Daniel Perley (LJMU), Theophile du Laz (Caltech) on behalf of ZTF
NEDSIMBADDECaLSPanSTARRS-1SkyMapperVizieRWISEDSSADS

Spectra

 ▌SN_2025vls - 2025-09-10 23:11:55 LT / SPRAT (ZTF)z=
 ▌SN_2025vls - 2025-09-06 22:48:12 LT / SPRAT (ZTF)z=
 ▌SN_2025vls - 2025-08-28 03:27:41 NOT / ALFOSC (GOTO)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-N_GOTO-1_L
 ▌P48_ZTF-Cam_r
   
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
22129 2025-09-10 23:11:55 LT / SPRAT Jacob Wise, Daniel Perley, K-Ryan Hinds, Zoe McGrath Jacob Wise ZTF tns_2025vls_2025-09-10_23-11-54.672_LT_SPRAT_ZTF.spec Object
21983 2025-09-06 22:48:12 LT / SPRAT Jacob Wise, Daniel Perley, K-Ryan Hinds, Zoe McGrath Jacob Wise ZTF tns_2025vls_2025-09-06_22-48-11.794_LT_SPRAT_ZTF.spec Object
21898 2025-08-28 03:27:41 NOT / ALFOSC M. Pursiainen, I. Worssam M. Pursiainen, I. Worssam GOTO tns_2025vls_2025-08-28_03-27-41.284_NOT_ALFOSC_GOTO.dat Object
Light Curves
Filter Tel / Inst Obs-date range JD Range Photometry
L-GOTO GOTO-N_GOTO-1 2025-08-25 02:03:51 - 2025-08-26 21:53:12 2460912.586006 - 2460914.411946 2
Photometry
ID Obs-date JD Mag. / Flux Err Lim. Mag./Flux Units Filter Tel / Inst Exp-time Observer/s Remarks
512974 2025-08-26 21:53:12 2460914.411946 18.72 0.19 ABMag L-GOTO GOTO-N_GOTO-1 180
512973 2025-08-25 02:03:51 2460912.586006 18.9 ABMag L-GOTO GOTO-N_GOTO-1 180 [Last non detection]
r-ZTF P48_ZTF-Cam 2025-06-27 08:35:03 - 2025-08-26 06:45:04 2460853.8576736 - 2460913.7812963 3
Photometry
ID Obs-date JD Mag. / Flux Err Lim. Mag./Flux Units Filter Tel / Inst Exp-time Observer/s Remarks
512397 2025-08-26 06:45:04 2460913.7812963 18.7514 0.0774296 ABMag r-ZTF P48_ZTF-Cam
512396 2025-06-29 08:13:47 2460855.8429051 19.4414 0.211995 ABMag r-ZTF P48_ZTF-Cam
512395 2025-06-27 08:35:03 2460853.8576736 20.4097 ABMag r-ZTF P48_ZTF-Cam [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
267958 2025-08-28 07:06:30 GOTO_bot M. Pursiainen,G. Ramsay,K. Ackley et al. GOTO GOTO 20:55:52.794 +15:27:42.64 2025-08-26 21:53:12.480 18.72 L-GOTO Other GOTO25gkl GOTO N
267708 2025-08-26 07:11:19 Fritz Jesper Sollerman (SU),Christoffer Fremling (Caltech),Daniel Perley (LJMU) et al. ZTF ZTF 20:55:52.772 +15:27:42.49 2025-06-29 08:13:47.000 19.4414 r-ZTF PSN ZTF25aaylgpw ZTF 2025TNSTR3381....1S N
Classification Reports
ID Time received (UT) Sender Classifier/s Group Classification Redshift Spectra Related files Assoc. Groups End prop. period Remarks ADS Bibcode
22129 2025-09-30 19:16:55 Jacob Wise Jacob Wise (LJMU), Daniel Perley (LJMU), K-Ryan Hinds (Caltech), Zoe McGrath (LJMU) ZTF SN Ia 0.041 1 1 ZTF Our 2nd spectrum does not show the possible faint H-alpha emission seen in the previous spectrum. By fitting our spectrum to template spectra from previously classified events, we find it to be a SN Ia at a redshift of z = 0.041 ± 0.003, hence we refine the redshift to this value. New redshift is consistent with that found in AstroNote #2025-269. Classification performed using Next Generation Superfit (NGSF, Goldwasser et al. 2022). 2025TNSCR3939....1W
Related files
File Comments Last Modified (UT) Modified By
tns_2025vls_atrep_22129_ZTF.pdf NGSF fits 2025-09-30 19:16:55 Jacob Wise
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
22129 2025-09-10 23:11:55 LT / SPRAT Jacob Wise, Daniel Perley, K-Ryan Hinds, Zoe McGrath Jacob Wise ZTF tns_2025vls_2025-09-10_23-11-54.672_LT_SPRAT_ZTF.spec Object
21983 2025-09-07 16:07:08 Jacob Wise Jacob Wise (LJMU), Daniel Perley (LJMU), K-Ryan Hinds (LJMU), Zoe McGrath (LJMU) ZTF SN Ia 0.0474 1 1 ZTF Spectrum is well-fit to template spectra from previously classified SN Ia events at a redshift of z = 0.0485 ± 0.0055, confirming previous classification. We note the presence of potential faint host H-alpha emission at z = 0.0474, which we take as the redshift for this classification. We encourage the collection of additional spectra to confirm the transient's redshift. Classification performed using Next Generation Superfit (NGSF, Goldwasser et al. 2022). 2025TNSCR3609....1W
Related files
File Comments Last Modified (UT) Modified By
tns_2025vls_atrep_21983_ZTF.pdf NGSF fits 2025-09-07 16:07:08 Jacob Wise
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
21983 2025-09-06 22:48:12 LT / SPRAT Jacob Wise, Daniel Perley, K-Ryan Hinds, Zoe McGrath Jacob Wise ZTF tns_2025vls_2025-09-06_22-48-11.794_LT_SPRAT_ZTF.spec Object
21898 2025-08-28 10:10:26 Joe Lyman I. Worssam, M. Pursiainen, D. O'Neill, J. Lyman, T. Killestein, K. Ackley, M. Dyer, 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, A. Kumar on behalf of GOTO collaboration GOTO SN Ia 0.04 1 GOTO Good matches to SN Ia just prior to peak-light. Redshift from template matching. 2025TNSCR3426....1W
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
21898 2025-08-28 03:27:41 NOT / ALFOSC M. Pursiainen, I. Worssam M. Pursiainen, I. Worssam GOTO tns_2025vls_2025-08-28_03-27-41.284_NOT_ALFOSC_GOTO.dat Object

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