2025aca | Transient Name Server

RA/DEC (2000)

09:42:10.329 +37:05:33.90

145.543039006 +37.0927490487

Type

SN IIb

Redshift

0.084

Discovery Report Classification Report

Related AstroNotes: 2025-73

Reporting Group

ZTF

Discovering Data Source

ZTF

Discovery Date

2025-01-23 07:54:30.000

TNS AT

Y

Public

Y

Discovery Mag

19.8397

Filter

r-ZTF

Reporter/s

Jesper Sollerman (SU), 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
	20555	2025-02-26 01:16:03	LT / SPRAT		Daniel Perley, Jacob Wise, K-Ryan Hinds, Zoe McGrath	Jacob Wise	ZTF	tns_2025aca_2025-02-26_01-16-02.863_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

Clear-

LAST_LAST-Cam

2025-01-09 00:14:57 - 2025-02-18 19:55:29

2460684.51038 - 2460725.3302

2

Photometry

ID	Obs-date	JD	Mag. / Flux	Err	Lim. Mag./Flux	Units	Filter	Tel / Inst	Exp-time	Observer/s	Remarks
469825	2025-02-18 19:55:29	2460725.3302	19.35			ABMag	Clear-	LAST_LAST-Cam	400
469824	2025-01-09 00:14:57	2460684.51038			20.82	ABMag	Clear-	LAST_LAST-Cam	400		[Last non detection]

w-P1

PS2_GPC2

2025-01-29 12:03:27 - 2025-01-29 12:03:27

2460705.0024 - 2460705.0024

1

Photometry

ID	Obs-date	JD	Mag. / Flux	Err	Lim. Mag./Flux	Units	Filter	Tel / Inst	Exp-time	Observer/s	Remarks
480290	2025-01-29 12:03:27	2460705.0024	20.23	0.08	22	ABMag	w-P1	PS2_GPC2	45	Robot

L-GOTO

GOTO-N_GOTO-1

2025-02-13 20:29:34 - 2025-02-15 23:56:12

2460720.353856 - 2460722.497361

2

Photometry

ID	Obs-date	JD	Mag. / Flux	Err	Lim. Mag./Flux	Units	Filter	Tel / Inst	Exp-time	Observer/s	Remarks
471028	2025-02-15 23:56:12	2460722.497361	19.14	0.18		ABMag	L-GOTO	GOTO-N_GOTO-1	180
471027	2025-02-13 20:29:34	2460720.353856			18.7	ABMag	L-GOTO	GOTO-N_GOTO-1	180		[Last non detection]

r-ZTF

P48_ZTF-Cam

2025-01-23 07:54:30 - 2025-01-23 07:54:30

2460698.8295139 - 2460698.8295139

1

Photometry

ID	Obs-date	JD	Mag. / Flux	Err	Lim. Mag./Flux	Units	Filter	Tel / Inst	Exp-time	Observer/s	Remarks
464263	2025-01-23 07:54:30	2460698.8295139	19.8397	0.200579		ABMag	r-ZTF	P48_ZTF-Cam

g-ZTF

P48_ZTF-Cam

2025-01-23 05:29:08 - 2025-01-24 08:26:53

2460698.7285648 - 2460699.8520023

2

Photometry

ID	Obs-date	JD	Mag. / Flux	Err	Lim. Mag./Flux	Units	Filter	Tel / Inst	Exp-time	Observer/s	Remarks
464264	2025-01-24 08:26:53	2460699.8520023	19.5005	0.12721		ABMag	g-ZTF	P48_ZTF-Cam
464262	2025-01-23 05:29:08	2460698.7285648			17.9043	ABMag	g-ZTF	P48_ZTF-Cam			[Last non detection]

cyan-ATLAS

ATLAS-HKO_ATLAS-02

2025-02-03 10:52:07 - 2025-02-04 10:16:42

2460709.95286 - 2460710.92826

2

Photometry

ID	Obs-date	JD	Mag. / Flux	Err	Lim. Mag./Flux	Units	Filter	Tel / Inst	Exp-time	Observer/s	Remarks
466944	2025-02-04 10:16:42	2460710.92826	19.446	0.164	19.62	ABMag	cyan-ATLAS	ATLAS-HKO_ATLAS-02	30	Robot
466943	2025-02-03 10:52:07	2460709.95286			19.59	ABMag	cyan-ATLAS	ATLAS-HKO_ATLAS-02	30	Robot	[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
250613	2025-04-02 22:26:33	PS1_Bot1	K. C. Chambers,T. de Boer,J. Fairlamb et al.	Pan-STARRS	Pan-STARRS	09:42:10.329	+37:05:33.90	2025-01-29 12:03:27.360	20.23	w-P1		PSN		PS25azg	Pan-STARRS				N
245630	2025-02-23 10:02:52	GOTO_bot	D. O'Neill,G. Ramsay,K. Ackley et al.	GOTO	GOTO	09:42:10.336	+37:05:33.78	2025-02-15 23:56:11.904	19.14	L-GOTO		Other		GOTO25aqy	GOTO				N
245057	2025-02-19 17:09:24	LAST_Bot1	R. Konno (WIS),E. Zimmerman (WIS),A. Horowicz (WIS) et al.	LAST	LAST	09:42:10.408	+37:05:34.25	2025-02-18 19:55:29.280	19.35	Clear-		PSN			LAST				N
243477	2025-02-04 15:09:36	ATLAS_Bot1	J. Tonry,L. Denneau,H. Weiland et al.	ATLAS	ATLAS	09:42:10.321	+37:05:33.89	2025-02-04 10:16:41.664	19.446	cyan-ATLAS		PSN		ATLAS25bjq	ATLAS				N
242263	2025-01-24 09:13:19	Fritz	Jesper Sollerman (SU),Christoffer Fremling (Caltech),Daniel Perley (LJMU) et al.	ZTF	ZTF	09:42:10.347	+37:05:33.95	2025-01-23 07:54:30.000	19.8397	r-ZTF		PSN		ZTF25aaczsit	ZTF			2025TNSTR.335....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

20555

2025-03-10 17:10:30

Jacob Wise

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

ZTF

SN IIb

0.084

1

ZTF

Spectrum taken post-peak is well-fit by template spectra from previously classified SN Ib events at a redshift of z = 0.084 ± 0.006. However, the potential presence of a weak, broad H-alpha feature combined with the event's ZTF lightcurve displaying an initial period of fast fading before a brighter peak motivates us to tentatively classify this as a SN IIb. Classification performed using Next Generation Superfit (NGSF, Goldwasser et al. 2022).

2025TNSCR.949....1W

Related files

File	Comments	Last Modified (UT)	Modified By
tns_2025aca_atrep_20555_ZTF.pdf	NGSF fits	2025-03-10 17:10:30	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
20555	2025-02-26 01:16:03	LT / SPRAT		Daniel Perley, Jacob Wise, K-Ryan Hinds, Zoe McGrath	Jacob Wise	ZTF	tns_2025aca_2025-02-26_01-16-02.863_LT_SPRAT_ZTF.spec		Object

Comments

Object coordinates updated

Object coordinates updated according to AT-report 250613 of Group Pan-STARRS
Previous RA, DEC: 09:42:10.347, +37:05:33.95 (145.5431128, +37.0927648)
Updated RA, DEC: 09:42:10.329, +37:05:33.90 (145.543039006, +37.0927490487)

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