2025aaan | Transient Name Server

RA/DEC (2000)

02:31:18.367 -20:28:13.97

37.826531 -20.4705467625

Type

SN Ia

Redshift

0.033466

Discovery Report Classification Report

Reporting Group

ZTF

Discovering Data Source

ZTF

Discovery Date

2025-10-07 10:02:19.996

TNS AT

Y

Public

Y

Discovery Mag

19.506

Filter

r-ZTF

Reporter/s

Nabeel Rehemtulla (CIERA, NU), Wynn Jacobson-Galán (Caltech), 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
	22237	2025-10-19 00:00:00	UH88 / SNIFS		C. Angus		SCAT	tns_2025aaan_2025-10-19_UH88_SNIFS_SCAT.dat		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
	22240	2025-10-13 05:55:43	P60 / SEDM	2700	SEDmRobot	jpurdum	ZTF	tns_2025aaan_2025-10-13_05-55-42.763746_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

Light Curves

Filter

Tel / Inst

Obs-date range

JD Range

Photometry

Clear-

LAST_LAST-Cam

2025-09-22 00:59:45 - 2025-10-24 20:21:29

2460940.54149 - 2460973.34825

2

Photometry

ID	Obs-date	JD	Mag. / Flux	Err	Lim. Mag./Flux	Units	Filter	Tel / Inst	Exp-time	Observer/s	Remarks
526637	2025-10-24 20:21:29	2460973.34825	17.27			ABMag	Clear-	LAST_LAST-Cam	400
526636	2025-09-22 00:59:45	2460940.54149			19.62	ABMag	Clear-	LAST_LAST-Cam	400		[Last non detection]

L-GOTO

GOTO-S_GOTO-3

2025-10-18 14:14:06 - 2025-10-18 14:14:06

2460967.093117 - 2460967.093117

1

Photometry

ID	Obs-date	JD	Mag. / Flux	Err	Lim. Mag./Flux	Units	Filter	Tel / Inst	Exp-time	Observer/s	Remarks
524794	2025-10-18 14:14:06	2460967.093117	17.12	0.02		ABMag	L-GOTO	GOTO-S_GOTO-3	180

orange-ATLAS

ATLAS-CHL_ATLAS-04

2025-10-12 04:54:00 - 2025-10-12 04:54:00

2460960.70417 - 2460960.70417

1

Photometry

ID	Obs-date	JD	Mag. / Flux	Err	Lim. Mag./Flux	Units	Filter	Tel / Inst	Exp-time	Observer/s	Remarks
524015	2025-10-12 04:54:00	2460960.70417	17.986	0.086	19.13	ABMag	orange-ATLAS	ATLAS-CHL_ATLAS-04	30	Robot

orange-ATLAS

ATLAS-STH_ATLAS-03

2025-10-10 23:27:44 - 2025-10-10 23:27:44

2460959.47759 - 2460959.47759

1

Photometry

ID	Obs-date	JD	Mag. / Flux	Err	Lim. Mag./Flux	Units	Filter	Tel / Inst	Exp-time	Observer/s	Remarks
524014	2025-10-10 23:27:44	2460959.47759			18.19	ABMag	orange-ATLAS	ATLAS-STH_ATLAS-03	30	Robot	[Last non detection]

L-GOTO

GOTO-N_GOTO-1

2025-10-08 02:36:52 - 2025-10-08 02:36:52

2460956.608937 - 2460956.608937

1

Photometry

ID	Obs-date	JD	Mag. / Flux	Err	Lim. Mag./Flux	Units	Filter	Tel / Inst	Exp-time	Observer/s	Remarks
524793	2025-10-08 02:36:52	2460956.608937			18.2	ABMag	L-GOTO	GOTO-N_GOTO-1	180		[Last non detection]

r-ZTF

P48_ZTF-Cam

2025-10-06 09:01:34 - 2025-10-07 10:02:20

2460954.876088 - 2460955.918287

2

Photometry

ID	Obs-date	JD	Mag. / Flux	Err	Lim. Mag./Flux	Units	Filter	Tel / Inst	Exp-time	Observer/s	Remarks
523090	2025-10-07 10:02:20	2460955.918287	19.506	0.202533		ABMag	r-ZTF	P48_ZTF-Cam
523089	2025-10-06 09:01:34	2460954.876088			19.4377	ABMag	r-ZTF	P48_ZTF-Cam			[Last non detection]

g-ZTF

P48_ZTF-Cam

2025-10-07 11:35:27 - 2025-10-12 06:45:05

2460955.9829514 - 2460960.7813079

3

Photometry

ID	Obs-date	JD	Mag. / Flux	Err	Lim. Mag./Flux	Units	Filter	Tel / Inst	Exp-time	Observer/s	Remarks
523091	2025-10-12 06:45:05	2460960.7813079	18.0443	0.0828644		ABMag	g-ZTF	P48_ZTF-Cam
524974	2025-10-09 08:41:33	2460957.8621875	18.9731	0.214802	19.0667	ABMag	g-ZTF	P48_ZTF-Cam	30	Robot	Data provided by ZTF, classified by Fink
524973	2025-10-07 11:35:27	2460955.9829514			18.471	ABMag	g-ZTF	P48_ZTF-Cam	30	Robot	[Last non detection] Data provided by ZTF, classified by Fink

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
274702	2025-10-24 20:37:25	LAST_Bot1	R. Konno (WIS),E. A. Zimmerman (WIS),A. Horowicz (WIS) et al.	LAST	LAST	02:31:18.389	-20:28:14.25	2025-10-24 20:21:28.800	17.27	Clear-		PSN			LAST				N
273959	2025-10-19 18:18:11	Fink	Julien Peloton,Anais Moller,Emille E. O. Ishida on behalf of the Fink broker et al.	Fink	ZTF	02:31:18.367	-20:28:13.97	2025-10-09 08:41:33.000	18.9731	g-ZTF		PSN		ZTF25abwhfuq	ZTF		Early SN Ia candidate classified by Fink using the public ZTF stream. Object data at https://fink-portal.org/ZTF25abwhfuq		N
273868	2025-10-19 08:49:15	GOTO_bot	D. O'Neill,G. Ramsay,K. Ackley et al.	GOTO	GOTO	02:31:18.372	-20:28:13.99	2025-10-18 14:14:05.568	17.12	L-GOTO		Other		GOTO25iqj	GOTO				N
273441	2025-10-15 12:36:24	ATLAS_Bot1	J. Tonry,L. Denneau,H. Weiland et al.	ATLAS	ATLAS	02:31:18.354	-20:28:14.12	2025-10-12 04:54:00.288	17.986	orange-ATLAS		PSN		ATLAS25mrk	ATLAS				N
272967	2025-10-12 07:36:09	BTSbot_bot	Nabeel Rehemtulla (CIERA,NU),Wynn Jacobson-Galán (Caltech) et al.	ZTF	ZTF	02:31:18.365	-20:28:13.95	2025-10-07 10:02:19.996	19.506	r-ZTF		PSN		ZTF25abwhfuq	ZTF		Bright (m_peak <= 18.5) transient candidate identified autonomously by BTSbot (Rehemtulla et al. 2024; arXiv:2401.15167).	2025TNSTR4088....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

22240

2025-10-19 19:12:50

ZTF_Bot1

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

ZTF

SN Ia

0.033466

1

ZTF

2025TNSCR4195....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
22240	2025-10-13 05:55:43	P60 / SEDM	2700	SEDmRobot	jpurdum	ZTF	tns_2025aaan_2025-10-13_05-55-42.763746_P60_SEDM_ZTF.ascii		Object

22237

2025-10-19 14:46:59

Charlotte Angus

C. Angus (QUB) on behalf of SCAT

SCAT

SN Ia

0.0334

1

SCAT

Spectrum taken with UH88/SNIFS on 19/10/2025. Template matches to SNe Ia around maximum light. Redshift from host galaxy redshift in NED. 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
22237	2025-10-19 00:00:00	UH88 / SNIFS		C. Angus		SCAT	tns_2025aaan_2025-10-19_UH88_SNIFS_SCAT.dat		Object

Comments

Object coordinates updated

Object coordinates updated according to AT-report 273959 of Group ZTF
Previous RA, DEC: 02:31:18.365, -20:28:13.95 (37.8265217, -20.4705412)
Updated RA, DEC: 02:31:18.367, -20:28:13.97 (37.826531, -20.4705467625)

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