2025yst | Transient Name Server

RA/DEC (2000)

23:39:36.951 +26:12:08.32

354.9039635 +26.2023106

Type

SN Ia

Redshift

0.074

Discovery Report Classification Report

Reporting Group

ATLAS

Discovering Data Source

ATLAS

Discovery Date

2025-09-26 00:03:08.352

TNS AT

Y

Public

Y

Discovery Mag

19.417

Filter

wide-ATLAS

Reporter/s

J. Tonry, L. Denneau, H. Weiland, R. Siverd (IfA, University of Hawaii), N. Erasmus, W. Koorts (South African Astronomical Observatory), A. Jordan, V. Suc (UAI, Obstech), M. R. Alarcón, J. Licandro, P. Nichita (IAC), S. J. Smartt, K. W. Smith (Oxford/QUB), D. R. Young, M. Nicholl, M. Fulton, M. McCollum, T. Moore, J. Weston, X. Sheng, C. R. Angus, A. Wilson, A. Aamer, D. Magill, P. J. Broda (QUB), P. Ramsden (Birmingham/QUB), L. Shingles (GSI/QUB), S. Srivastav, J. H. Gillanders, H. Stevance, A. J. Cooper, F. Stoppa, J. Tweddle (Oxford), L. Rhodes (TSI/McGill), A. Rest (STScI), T.-W. Chen (NCU), C. Stubbs (Harvard), J. S. Sommer (LMU), B. P. Schmidt (ANU)

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
	22139	2025-10-02 08:41:55	P60 / SEDM	2700	SEDmRobot	auto	ZTF	tns_2025yst_2025-10-02_08-41-55.259540_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 z-step: v-step: Remarks

Light Curves

Filter

Tel / Inst

Obs-date range

JD Range

Photometry

wide-ATLAS

ATLAS-TDO_ATLAS-05

2025-09-26 00:03:08 - 2025-09-26 00:03:08

2460944.50218 - 2460944.50218

1

Photometry

ID	Obs-date	JD	Mag. / Flux	Err	Lim. Mag./Flux	Units	Filter	Tel / Inst	Exp-time	Observer/s	Remarks
520436	2025-09-26 00:03:08	2460944.50218	19.417	0.132	20.25	ABMag	wide-ATLAS	ATLAS-TDO_ATLAS-05	30	Robot

Clear-

LAST_LAST-Cam

2025-09-25 18:21:20 - 2025-09-27 20:31:03

2460944.26481 - 2460946.3549

2

Photometry

ID	Obs-date	JD	Mag. / Flux	Err	Lim. Mag./Flux	Units	Filter	Tel / Inst	Exp-time	Observer/s	Remarks
520530	2025-09-27 20:31:03	2460946.3549	19.34			ABMag	Clear-	LAST_LAST-Cam	400
520529	2025-09-25 18:21:20	2460944.26481			20.21	ABMag	Clear-	LAST_LAST-Cam	400		[Last non detection]

L-GOTO

GOTO-N_GOTO-2

2025-09-13 22:30:52 - 2025-10-01 23:35:38

2460932.4381 - 2460950.483084

2

Photometry

ID	Obs-date	JD	Mag. / Flux	Err	Lim. Mag./Flux	Units	Filter	Tel / Inst	Exp-time	Observer/s	Remarks
521817	2025-10-01 23:35:38	2460950.483084	18.68	0.1		ABMag	L-GOTO	GOTO-N_GOTO-2	180
521816	2025-09-13 22:30:52	2460932.4381			19.7	ABMag	L-GOTO	GOTO-N_GOTO-2	180		[Last non detection]

r-ZTF

P48_ZTF-Cam

2025-09-21 06:03:50 - 2025-09-21 06:03:50

2460939.752662 - 2460939.752662

1

Photometry

ID	Obs-date	JD	Mag. / Flux	Err	Lim. Mag./Flux	Units	Filter	Tel / Inst	Exp-time	Observer/s	Remarks
520862	2025-09-21 06:03:50	2460939.752662			20.471	ABMag	r-ZTF	P48_ZTF-Cam			[Last non detection]

g-ZTF

P48_ZTF-Cam

2025-09-23 08:42:25 - 2025-09-30 06:23:00

2460941.8627894 - 2460948.7659722

2

Photometry

ID	Obs-date	JD	Mag. / Flux	Err	Lim. Mag./Flux	Units	Filter	Tel / Inst	Exp-time	Observer/s	Remarks
520864	2025-09-30 06:23:00	2460948.7659722	18.8081	0.057633		ABMag	g-ZTF	P48_ZTF-Cam
520863	2025-09-23 08:42:25	2460941.8627894	20.5476	0.172983		ABMag	g-ZTF	P48_ZTF-Cam

cyan-ATLAS

ATLAS-HKO_ATLAS-02

2025-09-25 10:44:55 - 2025-09-25 10:44:55

2460943.94786 - 2460943.94786

1

Photometry

ID	Obs-date	JD	Mag. / Flux	Err	Lim. Mag./Flux	Units	Filter	Tel / Inst	Exp-time	Observer/s	Remarks
520435	2025-09-25 10:44:55	2460943.94786			19.46	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
272293	2025-10-02 08:08:06	GOTO_bot	S. Belkin, G. Ramsay, K. Ackley et al.	GOTO	GOTO	23:39:36.971	+26:12:08.21	2025-10-01 23:35:38.112	18.68	L-GOTO		Other		GOTO25iee	GOTO				N
271760	2025-09-30 08:16:05	Fritz	Jesper Sollerman (SU), Christoffer Fremling (Caltech), Daniel Perley (LJMU) et al.	ZTF	ZTF	23:39:36.951	+26:12:08.32	2025-09-23 08:42:25.004	20.5476	g-ZTF		PSN		ZTF25abtfvex	ZTF				N
271585	2025-09-28 01:24:49	LAST_Bot1	E. O. Ofek (WIS), R. Konno (WIS), E. A. Zimmerman (WIS) et al.	LAST	LAST	23:39:36.944	+26:12:08.49	2025-09-27 20:31:03.360	19.34	Clear-		PSN			LAST				N
271530	2025-09-27 13:35:47	ATLAS_Bot1	J. Tonry, L. Denneau, H. Weiland et al.	ATLAS	ATLAS	23:39:36.943	+26:12:08.19	2025-09-26 00:03:08.352	19.417	wide-ATLAS		PSN		ATLAS25mbe	ATLAS			2025TNSTR3884....1T	N

Classification Reports

ID

Time received (UT)

Sender

Classifier/s

Group

Classification

Redshift

Spectra

Related files

Assoc. Groups

End prop. period

Remarks

ADS Bibcode

22139

2025-10-02 09:33:53

ZTF_Bot1

C. Fremling, D. Neill, Y. Sharma on behalf of the SEDM Team (Caltech) and the Zwicky Transient Facility (ZTF) based on SNIascore

ZTF

SN Ia

0.074

1

ZTF

2025TNSCR3972....1F

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
22139	2025-10-02 08:41:55	P60 / SEDM	2700	SEDmRobot	auto	ZTF	tns_2025yst_2025-10-02_08-41-55.259540_P60_SEDM_ZTF.ascii		Object

Comments

Object coordinates updated

Object coordinates updated according to AT-report 271760 of Group ZTF
Previous RA, DEC: 23:39:36.943, +26:12:08.19 (354.903927273, +26.2022754545)
Updated RA, DEC: 23:39:36.951, +26:12:08.32 (354.9039635, +26.2023106)

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