2025ztn | Transient Name Server

RA/DEC (2000)

02:03:00.504 -09:39:50.05

30.7520991127 -9.6639019717

Type

SN IIb

Redshift

0.0123

Discovery Report Classification Report

Related AstroNotes: DRAFT-2349, 2025-332

Reporting Group

ZTF

Discovering Data Source

ZTF

Discovery Date

2025-10-11 08:02:10.003

TNS AT

Y

Public

Y

Discovery Mag

19.1782

Filter

r-ZTF

Reporter/s

Nabeel Rehemtulla (CIERA, NU), Christoffer Fremling (Caltech), Daniel Perley (LJMU), Theophile du Laz (Caltech) on behalf of ZTF

NED SIMBAD DECaLS PanSTARRS-1 SkyMapper VizieR WISE DSS ADS

Light curves

Pointer position (MJD, Mag, Abs.Mag): (0.00, 0.00, 0.00)

Spectra

Select	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
	22495	2025-11-23 00:00:00	FLWO-1.5m / FAST	1500	Gilbert Esquerdo, Perry Berlind	S. Karthik Yadavalli, Harsh Kumar	VHU-TDA	tns_2025ztn_2025-11-23_FLWO-1.5m_FAST_VHU-TDA.ascii		Object
Binning factor: (rounded to nearest integer >1) Mouse hovers at WL: 0 (rest), 0 (observed) ▌Show H at z=v_exp= km/s ▌Show He at z=v_exp= km/s ▌Show He II at z=v_exp= km/s ▌Show C II at z=v_exp= km/s ▌Show C III at z=v_exp= km/s ▌Show C IV at z=v_exp= km/s ▌Show N II at z=v_exp= km/s ▌Show N III at z=v_exp= km/s ▌Show N IV at z=v_exp= km/s ▌Show N V at z=v_exp= km/s ▌Show O at z=v_exp= km/s ▌Show [O I] at z=v_exp= km/s ▌Show O II at z=v_exp= km/s ▌Show [O II] at z=v_exp= km/s ▌Show [O III] at z=v_exp= km/s ▌Show O V at z=v_exp= km/s ▌Show O VI at z=v_exp= km/s ▌Show Na at z=v_exp= km/s ▌Show Mg at z=v_exp= km/s ▌Show Mg II at z=v_exp= km/s ▌Show Si II at z=v_exp= km/s ▌Show S II at z=v_exp= km/s ▌Show Ca II at z=v_exp= km/s ▌Show [Ca II] at z=v_exp= km/s ▌Show Fe II at z=v_exp= km/s ▌Show Fe III at z=v_exp= km/s ▌Show Å at z=v_exp= km/s ▌Show Å at z=v_exp= km/s ▌Show Å at z=v_exp= km/s ▌Show Å at z=v_exp= km/s ▌Show Tellurics ▌Show Galaxy lines at z= ▌Show WR-WN at z=v_exp= km/s ▌Show WR-WC/O at z=v_exp= km/s Remarks
	22499	2025-10-18 07:34:47	MMT / BINOSPEC		MMT Queue Observers		ZTF	tns_2025ztn_2460966.81582000_MMT_BINOSPEC_ZTF.ascii		Object
Binning factor: (rounded to nearest integer >1) Mouse hovers at WL: 0 (rest), 0 (observed) ▌Show H at z=v_exp= km/s ▌Show He at z=v_exp= km/s ▌Show He II at z=v_exp= km/s ▌Show C II at z=v_exp= km/s ▌Show C III at z=v_exp= km/s ▌Show C IV at z=v_exp= km/s ▌Show N II at z=v_exp= km/s ▌Show N III at z=v_exp= km/s ▌Show N IV at z=v_exp= km/s ▌Show N V at z=v_exp= km/s ▌Show O at z=v_exp= km/s ▌Show [O I] at z=v_exp= km/s ▌Show O II at z=v_exp= km/s ▌Show [O II] at z=v_exp= km/s ▌Show [O III] at z=v_exp= km/s ▌Show O V at z=v_exp= km/s ▌Show O VI at z=v_exp= km/s ▌Show Na at z=v_exp= km/s ▌Show Mg at z=v_exp= km/s ▌Show Mg II at z=v_exp= km/s ▌Show Si II at z=v_exp= km/s ▌Show S II at z=v_exp= km/s ▌Show Ca II at z=v_exp= km/s ▌Show [Ca II] at z=v_exp= km/s ▌Show Fe II at z=v_exp= km/s ▌Show Fe III at z=v_exp= km/s ▌Show Å at z=v_exp= km/s ▌Show Å at z=v_exp= km/s ▌Show Å at z=v_exp= km/s ▌Show Å at z=v_exp= km/s ▌Show Tellurics ▌Show Galaxy lines at z= ▌Show WR-WN at z=v_exp= km/s ▌Show WR-WC/O at z=v_exp= km/s Remarks
	22190	2025-10-12 03:39:45	LT / SPRAT		Jacob Wise, Daniel Perley, K-Ryan Hinds, Aleksandra Bochenek, Zoe McGrath	Jacob Wise	ZTF	tns_2025ztn_2025-10-12_03-39-45.342_LT_SPRAT_ZTF.spec		Object
Binning factor: (rounded to nearest integer >1) Mouse hovers at WL: 0 (rest), 0 (observed) ▌Show H at z=v_exp= km/s ▌Show He at z=v_exp= km/s ▌Show He II at z=v_exp= km/s ▌Show C II at z=v_exp= km/s ▌Show C III at z=v_exp= km/s ▌Show C IV at z=v_exp= km/s ▌Show N II at z=v_exp= km/s ▌Show N III at z=v_exp= km/s ▌Show N IV at z=v_exp= km/s ▌Show N V at z=v_exp= km/s ▌Show O at z=v_exp= km/s ▌Show [O I] at z=v_exp= km/s ▌Show O II at z=v_exp= km/s ▌Show [O II] at z=v_exp= km/s ▌Show [O III] at z=v_exp= km/s ▌Show O V at z=v_exp= km/s ▌Show O VI at z=v_exp= km/s ▌Show Na at z=v_exp= km/s ▌Show Mg at z=v_exp= km/s ▌Show Mg II at z=v_exp= km/s ▌Show Si II at z=v_exp= km/s ▌Show S II at z=v_exp= km/s ▌Show Ca II at z=v_exp= km/s ▌Show [Ca II] at z=v_exp= km/s ▌Show Fe II at z=v_exp= km/s ▌Show Fe III at z=v_exp= km/s ▌Show Å at z=v_exp= km/s ▌Show Å at z=v_exp= km/s ▌Show Å at z=v_exp= km/s ▌Show Å at z=v_exp= km/s ▌Show Tellurics ▌Show Galaxy lines at z= ▌Show WR-WN at z=v_exp= km/s ▌Show WR-WC/O at z=v_exp= km/s Remarks

Light Curves

Filter

Tel / Inst

Obs-date range

JD Range

Photometry

wide-ATLAS

ATLAS-TDO_ATLAS-05

2025-10-11 01:11:26 - 2025-10-12 00:09:49

2460959.54961 - 2460960.50682

2

Photometry

ID	Obs-date	JD	Mag. / Flux	Err	Lim. Mag./Flux	Units	Filter	Tel / Inst	Exp-time	Observer/s	Remarks
523132	2025-10-12 00:09:49	2460960.50682	18.542	0.162	19.57	ABMag	wide-ATLAS	ATLAS-TDO_ATLAS-05	30	Robot
523131	2025-10-11 01:11:26	2460959.54961			19.31	ABMag	wide-ATLAS	ATLAS-TDO_ATLAS-05	30	Robot	[Last non detection]

L-GOTO

GOTO-N_GOTO-2

2025-10-18 23:09:39 - 2025-10-18 23:09:39

2460967.46504 - 2460967.46504

1

Photometry

ID	Obs-date	JD	Mag. / Flux	Err	Lim. Mag./Flux	Units	Filter	Tel / Inst	Exp-time	Observer/s	Remarks
524868	2025-10-18 23:09:39	2460967.46504	16.83	0.02		ABMag	L-GOTO	GOTO-N_GOTO-2	180

w-P1

PS2_GPC2

2025-12-14 06:34:11 - 2025-12-14 06:34:11

2461023.77374 - 2461023.77374

1

Photometry

ID	Obs-date	JD	Mag. / Flux	Err	Lim. Mag./Flux	Units	Filter	Tel / Inst	Exp-time	Observer/s	Remarks
539492	2025-12-14 06:34:11	2461023.77374	17.56	0.01	22	ABMag	w-P1	PS2_GPC2	45	Robot

L-GOTO

GOTO-N_GOTO-1

2025-10-05 00:35:12 - 2025-10-05 00:35:12

2460953.524449 - 2460953.524449

1

Photometry

ID	Obs-date	JD	Mag. / Flux	Err	Lim. Mag./Flux	Units	Filter	Tel / Inst	Exp-time	Observer/s	Remarks
524867	2025-10-05 00:35:12	2460953.524449			19.1	ABMag	L-GOTO	GOTO-N_GOTO-1	180		[Last non detection]

r-ZTF

P48_ZTF-Cam

2025-10-11 08:02:10 - 2025-10-11 08:02:10

2460959.834838 - 2460959.834838

1

Photometry

ID	Obs-date	JD	Mag. / Flux	Err	Lim. Mag./Flux	Units	Filter	Tel / Inst	Exp-time	Observer/s	Remarks
522782	2025-10-11 08:02:10	2460959.834838	19.1782	0.0918955		ABMag	r-ZTF	P48_ZTF-Cam

g-ZTF

P48_ZTF-Cam

2025-10-09 08:40:52 - 2025-10-11 09:03:56

2460957.861713 - 2460959.8777315

2

Photometry

ID	Obs-date	JD	Mag. / Flux	Err	Lim. Mag./Flux	Units	Filter	Tel / Inst	Exp-time	Observer/s	Remarks
522783	2025-10-11 09:03:56	2460959.8777315	19.5583	0.152393		ABMag	g-ZTF	P48_ZTF-Cam
522781	2025-10-09 08:40:52	2460957.861713			19.1667	ABMag	g-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
280888	2025-12-16 23:40:24	PS1_Bot1	K. C. Chambers, T. de Boer, J. Fairlamb et al.	Pan-STARRS	Pan-STARRS	02:03:00.504	-09:39:50.05	2025-12-14 06:34:11.136	17.56	w-P1		PSN		PS25iqt	Pan-STARRS				N
273905	2025-10-19 10:41:50	GOTO_bot	G. Ramsay, D. O'Neill, K. Ackley et al.	GOTO	GOTO	02:03:00.490	-09:39:49.93	2025-10-18 23:09:39.456	16.83	L-GOTO		Other		GOTO25ira	GOTO				N
272989	2025-10-12 08:57:41	ATLAS_Bot1	J. Tonry, L. Denneau, H. Weiland et al.	ATLAS	ATLAS	02:03:00.485	-09:39:50.15	2025-10-12 00:09:49.248	18.542	wide-ATLAS		PSN		ATLAS25moi	ATLAS				N
272742	2025-10-11 13:36:46	Fritz	Nabeel Rehemtulla (CIERA, NU), Christoffer Fremling (Caltech), Daniel Perley (LJMU) et al.	ZTF	ZTF	02:03:00.498	-09:39:50.06	2025-10-11 08:02:10.003	19.1782	r-ZTF		PSN		ZTF25abwjtwc	ZTF			2025TNSTR4074....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

22498

2025-12-02 19:35:27

Nabeel Rehemtulla

Nabeel Rehemtulla (NU, CIERA) on behalf of the ZTF collaboration

ZTF

SN IIb

1

ZTF

We revise the classification to SN IIb based on the detection of broad P Cygni H alpha and He I absorption.

2025TNSCR4817....1R

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
22499	2025-10-18 07:34:47	MMT / BINOSPEC		MMT Queue Observers		ZTF	tns_2025ztn_2460966.81582000_MMT_BINOSPEC_ZTF.ascii		Object

22494

2025-12-02 01:18:29

VHU-TDA

Yize Dong, Anya Nugent, V. Ashley Villar, S. Karthik Yadavalli, Alex Gagliano, Kaylee de Soto, Danielle Frostig, Harsh Kumar, Peter Blanchard

VHU-TDA

SN Ib

0.0123

1

1

VHU-TDA

redshift measured from the narrow host lines

2025TNSCR4810....1D

Related files

File	Comments	Last Modified (UT)	Modified By
tns_2025ztn_atrep_22494_VHU-TDA.png	Note - previously classified as IIb	2025-12-02 01:18:33	VHU-TDA

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
22495	2025-11-23 00:00:00	FLWO-1.5m / FAST	1500	Gilbert Esquerdo, Perry Berlind	S. Karthik Yadavalli, Harsh Kumar	VHU-TDA	tns_2025ztn_2025-11-23_FLWO-1.5m_FAST_VHU-TDA.ascii		Object

22190

2025-10-12 04:22:00

Jacob Wise

Jacob Wise (LJMU), Daniel Perley (LJMU), K-Ryan Hinds (Caltech), Aleksandra Bochenek (LJMU), Zoe McGrath (LJMU)

ZTF

SN IIb

0.012879

1

1

ZTF

Spectrum is well-fit to template spectra from previously classified young SN IIb. Redshift of z = 0.012879 ± 0.000017 from Springob et al. (2005). Classification performed using Next Generation Superfit (NGSF, Goldwasser et al. 2022).

2025TNSCR4093....1W

Related files

File	Comments	Last Modified (UT)	Modified By
tns_2025ztn_atrep_22190_ZTF.pdf	NGSF fits	2025-10-12 04:22:00	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
22190	2025-10-12 03:39:45	LT / SPRAT		Jacob Wise, Daniel Perley, K-Ryan Hinds, Aleksandra Bochenek, Zoe McGrath	Jacob Wise	ZTF	tns_2025ztn_2025-10-12_03-39-45.342_LT_SPRAT_ZTF.spec		Object

Comments

Object coordinates updated

Object coordinates updated according to AT-report 280888 of Group Pan-STARRS
Previous RA, DEC: 02:03:00.498, -09:39:50.06 (30.7520769, -9.6639063)
Updated RA, DEC: 02:03:00.504, -09:39:50.05 (30.7520991127, -9.6639019717)

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