2025agii | Transient Name Server

RA/DEC (2000)

01:50:54.882 -03:55:44.23

27.7286734287 -3.92895209742

Type

SN IIn

Redshift

0.0417

Discovery Report Classification Report

Reporting Group

ZTF

Discovering Data Source

ZTF

Discovery Date

2025-12-11 04:13:14.001

TNS AT

Y

Public

Y

Discovery Mag

20.0838

Filter

g-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
	22785	2026-01-16 03:06:30	P60 / SEDM	2160	SEDmRobot		ZTF	tns_2025agii_2026-01-16_03-06-30.258117_P60_SEDM_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
	22809	2026-01-15 03:07:50	Lick-3m / KAST		Aleksandra Bochenek (LJMU), Christian Tapper (UCLA), Emily Elien (UCLA), R. Michael Rich (UCLA)	Zoë McGrath (LJMU)	ZTF	tns_2025agii_2026-01-15_03-07-50_Lick-3m_KAST_ZTF.txt		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

w-P1

PS2_GPC2

2025-12-22 05:55:25 - 2025-12-22 05:55:25

2461031.74682 - 2461031.74682

1

Photometry

ID	Obs-date	JD	Mag. / Flux	Err	Lim. Mag./Flux	Units	Filter	Tel / Inst	Exp-time	Observer/s	Remarks
544663	2025-12-22 05:55:25	2461031.74682	19.2	0.05	22	ABMag	w-P1	PS2_GPC2	45	Robot

orange-ATLAS

ATLAS-CHL_ATLAS-04

2025-12-20 01:55:06 - 2025-12-20 01:55:06

2461029.57993 - 2461029.57993

1

Photometry

ID	Obs-date	JD	Mag. / Flux	Err	Lim. Mag./Flux	Units	Filter	Tel / Inst	Exp-time	Observer/s	Remarks
541988	2025-12-20 01:55:06	2461029.57993	19.049	0.179	19.18	ABMag	orange-ATLAS	ATLAS-CHL_ATLAS-04	30	Robot

cyan-ATLAS

ATLAS-STH_ATLAS-03

2025-12-17 20:28:26 - 2025-12-17 20:28:26

2461027.35308 - 2461027.35308

1

Photometry

ID	Obs-date	JD	Mag. / Flux	Err	Lim. Mag./Flux	Units	Filter	Tel / Inst	Exp-time	Observer/s	Remarks
541987	2025-12-17 20:28:26	2461027.35308			19.48	ABMag	cyan-ATLAS	ATLAS-STH_ATLAS-03	30	Robot	[Last non detection]

L-GOTO

GOTO-N_GOTO-1

2025-12-08 22:43:40 - 2025-12-10 22:21:33

2461018.446995 - 2461020.431628

2

Photometry

ID	Obs-date	JD	Mag. / Flux	Err	Lim. Mag./Flux	Units	Filter	Tel / Inst	Exp-time	Observer/s	Remarks
540670	2025-12-10 22:21:33	2461020.431628	19.84	0.2		ABMag	L-GOTO	GOTO-N_GOTO-1	180
540669	2025-12-08 22:43:40	2461018.446995			19.8	ABMag	L-GOTO	GOTO-N_GOTO-1	180		[Last non detection]

BG-q-BlackGem

BG4_BlackGEM-Cam4

2025-12-23 00:59:27 - 2025-12-23 00:59:27

2461032.5412847 - 2461032.5412847

1

Photometry

ID	Obs-date	JD	Mag. / Flux	Err	Lim. Mag./Flux	Units	Filter	Tel / Inst	Exp-time	Observer/s	Remarks
542017	2025-12-23 00:59:27	2461032.5412847	19.16	0.12	20.4	ABMag	BG-q-BlackGem	BG4_BlackGEM-Cam4	60	robotic

BG-q-BlackGem

BG2_BlackGEM-Cam2

2025-10-21 01:18:50 - 2025-10-21 01:18:50

2460969.5547454 - 2460969.5547454

1

Photometry

ID	Obs-date	JD	Mag. / Flux	Err	Lim. Mag./Flux	Units	Filter	Tel / Inst	Exp-time	Observer/s	Remarks
542016	2025-10-21 01:18:50	2460969.5547454			20.46	ABMag	BG-q-BlackGem	BG2_BlackGEM-Cam2	60	robotic	[Last non detection]

r-ZTF

P48_ZTF-Cam

2025-12-11 05:06:42 - 2025-12-11 05:06:42

2461020.7129861 - 2461020.7129861

1

Photometry

ID	Obs-date	JD	Mag. / Flux	Err	Lim. Mag./Flux	Units	Filter	Tel / Inst	Exp-time	Observer/s	Remarks
537483	2025-12-11 05:06:42	2461020.7129861	19.4988	0.109964		ABMag	r-ZTF	P48_ZTF-Cam

g-ZTF

P48_ZTF-Cam

2025-12-07 03:16:35 - 2025-12-11 04:13:14

2461016.6365162 - 2461020.6758565

2

Photometry

ID	Obs-date	JD	Mag. / Flux	Err	Lim. Mag./Flux	Units	Filter	Tel / Inst	Exp-time	Observer/s	Remarks
537482	2025-12-11 04:13:14	2461020.6758565	20.0838	0.20713		ABMag	g-ZTF	P48_ZTF-Cam
537481	2025-12-07 03:16:35	2461016.6365162			19.3934	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
283545	2025-12-29 15:33:04	PS1_Bot1	K. C. Chambers, T. de Boer, J. Fairlamb et al.	Pan-STARRS	Pan-STARRS	01:50:54.882	-03:55:44.23	2025-12-22 05:55:25.248	19.2	w-P1		PSN		PS25jwt	Pan-STARRS				N
282008	2025-12-23 07:21:02	BlackGEM_Bot1	G. Ramsay, H. Tranin, F. Stoppa et al.	BlackGEM	BlackGEM	01:50:54.930	-03:55:44.27	2025-12-23 00:59:27.000	19.16	BG-q-BlackGem		PSN		BGEM J015054.93-035544.3	BlackGEM				N
281993	2025-12-22 23:56:54	ATLAS_Bot1	J. Tonry, L. Denneau, H. Weiland (IfA, University of Hawaii) et al.	ATLAS	ATLAS	01:50:54.878	-03:55:44.14	2025-12-20 01:55:05.952	19.049	orange-ATLAS		PSN		ATLAS25qdd	ATLAS				N
281429	2025-12-19 10:40:01	GOTO_bot	D. O'Neill, G. Ramsay, K. Ackley et al.	GOTO	GOTO	01:50:54.897	-03:55:44.31	2025-12-10 22:21:32.832	19.84	L-GOTO		Other		GOTO25lzl	GOTO				N
280000	2025-12-11 09:45:12	Fritz	Jesper Sollerman (SU), Christoffer Fremling (Caltech), Daniel Perley (LJMU) et al.	ZTF	ZTF	01:50:54.890	-03:55:44.30	2025-12-11 04:13:14.001	20.0838	g-ZTF		PSN		ZTF25acggpbd	ZTF			2025TNSTR4931....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

22808

2026-01-19 18:29:53

Zoë McGrath

Jacob Wise (LJMU), Zoë McGrath (LJMU), Aleksandra Bochenek (LJMU)

ZTF

SN IIn

0.0417

1

ZTF

Confirmation as a IIn with precursor emission. Redshift updated to 0.0417, determined using host galaxy lines in the Lick KAST spectrum from 2026-01-15. Classification confirmed using Next Generation Superfit (NGSF, Goldwasser et al. 2022).

2026TNSCR.242....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
22809	2026-01-15 03:07:50	Lick-3m / KAST		Aleksandra Bochenek (LJMU), Christian Tapper (UCLA), Emily Elien (UCLA), R. Michael Rich (UCLA)	Zoë McGrath (LJMU)	ZTF	tns_2025agii_2026-01-15_03-07-50_Lick-3m_KAST_ZTF.txt		Object

22784

2026-01-16 16:27:39

ZTF_Bot1

J. Sollerman, J. Castaneda Jaimes, M. Chu, C. Fremling (Caltech) on behalf of the Zwicky Transient Facility (ZTF)

ZTF

SN IIn

0.041

1

ZTF

2026TNSCR.193....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
22785	2026-01-16 03:06:30	P60 / SEDM	2160	SEDmRobot		ZTF	tns_2025agii_2026-01-16_03-06-30.258117_P60_SEDM_ZTF.ascii		Object

Comments

Object coordinates updated

Object coordinates updated according to AT-report 283545 of Group Pan-STARRS
Previous RA, DEC: 01:50:54.890, -03:55:44.30 (27.7287075, -3.9289726)
Updated RA, DEC: 01:50:54.882, -03:55:44.23 (27.7286734287, -3.92895209742)

Log in or register to post comments

Log in or register to post comments