RA/DEC (2000)
04:12:32.660 -08:58:47.68
63.1360852678 -8.97991031668
Type
SN IIb
Redshift
0.037
Discovery ReportClassification Report
Related AstroNotes: 2025-301
Reporting Group
ZTF
Discovering Data Source
ZTF
Discovery Date
2025-10-11 08:32:54.003
TNS AT
Y
Public
Y
Discovery Mag
17.6955
Filter
r-ZTF
Reporter/s
Nabeel Rehemtulla (CIERA, NU), Wynn Jacobson-Galán (Caltech), Theophile du Laz (Caltech) on behalf of ZTF
NEDSIMBADDECaLSPanSTARRS-1SkyMapperVizieRWISEDSSADS

Spectra

 ▌SN_2025zth - 2025-12-09 05:02:26 P60 / SEDM (ZTF)z=
 ▌SN_2025zth - 2025-10-29 07:36:08 P60 / SEDM (ZTF)z=
 ▌SN_2025zth - 2025-10-19 00:00:00 UH88 / SNIFS (SCAT)z=
 ▌SN_2025zth - 2025-10-12 00:00:00 NOT / ALFOSC (None)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
 ▌LAST_LAST-Cam_Clear
 ▌GOTO-S_GOTO-3_L
 ▌ATLAS-STH_ATLAS-03_orange
 ▌GOTO-N_GOTO-1_L
 ▌P48_ZTF-Cam_r
 ▌P48_ZTF-Cam_g
 ▌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
22544 2025-12-09 05:02:26 P60 / SEDM 2700 SEDmRobot auto ZTF tns_2025zth_2025-12-09_05-02-25.687892_P60_SEDM_ZTF.ascii Object
22318 2025-10-29 07:36:08 P60 / SEDM 2160 SEDmRobot auto ZTF tns_2025zth_2025-10-29_07-36-07.665885_P60_SEDM_ZTF.ascii Object
22238 2025-10-19 00:00:00 UH88 / SNIFS C. Angus SCAT tns_2025zth_2025-10-19_UH88_SNIFS_SCAT.dat Object
22203 2025-10-12 00:00:00 NOT / ALFOSC 1800 Roar Holmberg Niko Pyykkinen None tns_2025zth_2025-10-12_NOT_ALFOSC_None.dat tns_2025zth_2025-10-12_NOT_ALFOSC_None.fits Object
Light Curves
Filter Tel / Inst Obs-date range JD Range Photometry
wide-ATLAS ATLAS-TDO_ATLAS-05 2025-10-11 02:34:34 - 2025-10-11 02:34:34 2460959.60734 - 2460959.60734 1
Photometry
ID Obs-date JD Mag. / Flux Err Lim. Mag./Flux Units Filter Tel / Inst Exp-time Observer/s Remarks
522799 2025-10-11 02:34:34 2460959.60734 17.802 0.056 19.19 ABMag wide-ATLAS ATLAS-TDO_ATLAS-05 30 Robot
Clear- LAST_LAST-Cam 2024-12-03 22:44:01 - 2025-10-11 23:12:24 2460648.44723 - 2460960.46695 2
Photometry
ID Obs-date JD Mag. / Flux Err Lim. Mag./Flux Units Filter Tel / Inst Exp-time Observer/s Remarks
523057 2025-10-11 23:12:24 2460960.46695 17.86 ABMag Clear- LAST_LAST-Cam 400
523056 2024-12-03 22:44:01 2460648.44723 20.09 ABMag Clear- LAST_LAST-Cam 400 [Last non detection]
L-GOTO GOTO-S_GOTO-3 2025-10-14 18:10:01 - 2025-10-14 18:10:01 2460963.256963 - 2460963.256963 1
Photometry
ID Obs-date JD Mag. / Flux Err Lim. Mag./Flux Units Filter Tel / Inst Exp-time Observer/s Remarks
523915 2025-10-14 18:10:01 2460963.256963 17.22 0.02 ABMag L-GOTO GOTO-S_GOTO-3 180
orange-ATLAS ATLAS-STH_ATLAS-03 2025-10-10 00:01:59 - 2025-10-10 00:01:59 2460958.50138 - 2460958.50138 1
Photometry
ID Obs-date JD Mag. / Flux Err Lim. Mag./Flux Units Filter Tel / Inst Exp-time Observer/s Remarks
522798 2025-10-10 00:01:59 2460958.50138 16.8 ABMag orange-ATLAS ATLAS-STH_ATLAS-03 30 Robot [Last non detection]
L-GOTO GOTO-N_GOTO-1 2025-10-09 03:21:06 - 2025-10-09 03:21:06 2460957.639652 - 2460957.639652 1
Photometry
ID Obs-date JD Mag. / Flux Err Lim. Mag./Flux Units Filter Tel / Inst Exp-time Observer/s Remarks
523914 2025-10-09 03:21:06 2460957.639652 18.5 ABMag L-GOTO GOTO-N_GOTO-1 180 [Last non detection]
r-ZTF P48_ZTF-Cam 2025-10-07 10:15:52 - 2025-10-11 08:32:54 2460955.9276852 - 2460959.8561806 2
Photometry
ID Obs-date JD Mag. / Flux Err Lim. Mag./Flux Units Filter Tel / Inst Exp-time Observer/s Remarks
522765 2025-10-11 08:32:54 2460959.8561806 17.6955 0.0258944 ABMag r-ZTF P48_ZTF-Cam
522764 2025-10-07 10:15:52 2460955.9276852 19.463 ABMag r-ZTF P48_ZTF-Cam [Last non detection]
g-ZTF P48_ZTF-Cam 2025-10-11 09:31:57 - 2025-10-11 09:31:57 2460959.8971875 - 2460959.8971875 1
Photometry
ID Obs-date JD Mag. / Flux Err Lim. Mag./Flux Units Filter Tel / Inst Exp-time Observer/s Remarks
522766 2025-10-11 09:31:57 2460959.8971875 17.6075 0.0460228 ABMag g-ZTF P48_ZTF-Cam
i-P1 PS1_GPC1 2025-10-12 12:11:27 - 2025-10-12 12:11:27 2460961.00795 - 2460961.00795 1
Photometry
ID Obs-date JD Mag. / Flux Err Lim. Mag./Flux Units Filter Tel / Inst Exp-time Observer/s Remarks
524083 2025-10-12 12:11:27 2460961.00795 17.62 0.03 20.7 ABMag i-P1 PS1_GPC1 27 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
273476 2025-10-15 13:56:48 YSE_Bot1 D. O. Jones (UC Santa Cruz),K. D. French (Carnegie,Illinois) et al. YSE Pan-STARRS 04:12:32.660 -08:58:47.68 2025-10-12 12:11:26.880 17.62 i-P1 PSN PS25ieh Pan-STARRS N
273391 2025-10-14 23:54:05 GOTO_bot S. Belkin,K. Ackley,M. Dyer et al. GOTO GOTO 04:12:32.665 -08:58:47.71 2025-10-14 18:10:01.344 17.22 L-GOTO Other GOTO25ioi GOTO N
272955 2025-10-12 01:04:25 LAST_Bot1 E. O. Ofek (WIS),R. Konno (WIS),E. A. Zimmerman (WIS) et al. LAST LAST 04:12:32.663 -08:58:48.04 2025-10-11 23:12:24.480 17.86 Clear- PSN LAST N
272750 2025-10-11 16:40:35 ATLAS_Bot1 J. Tonry,L. Denneau,H. Weiland et al. ATLAS ATLAS 04:12:32.645 -08:58:47.76 2025-10-11 02:34:34.176 17.802 wide-ATLAS PSN ATLAS25moh ATLAS N
272734 2025-10-11 09:40:26 BTSbot_bot Nabeel Rehemtulla (CIERA,NU),Wynn Jacobson-Galán (Caltech) et al. ZTF ZTF 04:12:32.657 -08:58:47.61 2025-10-11 08:32:54.003 17.6955 r-ZTF PSN ZTF25abwkieo ZTF Bright (m_peak <= 18.5) transient candidate identified autonomously by BTSbot (Rehemtulla et al. 2024; arXiv:2401.15167). 2025TNSTR4075....1R N
Classification Reports
ID Time received (UT) Sender Classifier/s Group Classification Redshift Spectra Related files Assoc. Groups End prop. period Remarks ADS Bibcode
22543 2025-12-09 06:49:21 ZTF_Bot1 J. Sollerman, S. Covarrubias, M. Chu, C. Fremling (Caltech) on behalf of the Zwicky Transient Facility (ZTF) ZTF SN IIb 0.037 1 ZTF 2025TNSCR4905....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
22544 2025-12-09 05:02:26 P60 / SEDM 2700 SEDmRobot auto ZTF tns_2025zth_2025-12-09_05-02-25.687892_P60_SEDM_ZTF.ascii Object
22318 2025-10-29 08:44:32 ZTF_Bot1 J. Sollerman, S. Covarrubias, M. Chu, C. Fremling (Caltech) on behalf of the Zwicky Transient Facility (ZTF) ZTF SN Ic-BL 0.037 1 ZTF 2025TNSCR4353....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
22318 2025-10-29 07:36:08 P60 / SEDM 2160 SEDmRobot auto ZTF tns_2025zth_2025-10-29_07-36-07.665885_P60_SEDM_ZTF.ascii Object
22238 2025-10-19 15:18:49 Charlotte Angus C. Angus (QUB) on behalf of SCAT SCAT SN IIb 0.037 1 SCAT Spectrum taken with UH88/SNIFS on 19/10/2025. Template matches to SNe IIb, and host redshift from emission lines measured to be z=0.037. Classification was done using SNID 2025TNSCR4193....1A
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
22238 2025-10-19 00:00:00 UH88 / SNIFS C. Angus SCAT tns_2025zth_2025-10-19_UH88_SNIFS_SCAT.dat Object
22203 2025-10-13 15:48:51 Niko Pyykkinen Niko Pyykkinen (NOT/UTU), Roar Holmberg (NOT/Aarhus), Hanindyo Kuncarayakti (UTU) None SN 0.037 1 Redshift measured from the host galaxy H-alpha line. No clear matches with SNID or gelato, some presence of a broad possible H-alpha line can be seen. Object seems to be quite bright <-18.8 absolute mag when counting with the redshift. 2025TNSCR4108....1P
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
22203 2025-10-12 00:00:00 NOT / ALFOSC 1800 Roar Holmberg Niko Pyykkinen None tns_2025zth_2025-10-12_NOT_ALFOSC_None.dat tns_2025zth_2025-10-12_NOT_ALFOSC_None.fits Object

Comments

TNS
System

Wed, 10/15/2025 - 13:56

Object coordinates updated

Object coordinates updated according to AT-report 273476 of Group Pan-STARRS
Previous RA, DEC: 04:12:32.657, -08:58:47.61 (63.1360699, -8.9798924)
Updated RA, DEC: 04:12:32.660, -08:58:47.68 (63.1360852678, -8.97991031668)