2025yn | Transient Name Server

RA/DEC (2000)

02:04:18.708 -08:44:27.35

31.0779519 -8.7409293

Type

SN II

Redshift

0.017

Discovery Report Classification Report

Related AstroNotes: 2025-33

Reporting Group

ATLAS

Discovering Data Source

ATLAS

Discovery Date

2025-01-21 06:37:40.224

TNS AT

Y

Public

Y

Discovery Mag

18.978

Filter

cyan-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), 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 (QUB), P. Ramsden (Birmingham/QUB), L. Shingles (GSI/QUB), S. Srivastav, J. H. Gillanders, H. Stevance, A. J. Cooper, F. Stoppa (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
	20230	2025-01-24 01:07:11	ESO-NTT / EFOSC2-NTT	899	Simon de Wet, Hannah Wichern	Giorgos Leloudas	ePESSTO+	tns_2025yn_2025-01-24_01-07-11_ESO-NTT_EFOSC2-NTT_ePESSTO+.asci	tns_2025yn_2025-01-24_01-07-11_ESO-NTT_EFOSC2-NTT_ePESSTO+.fits	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

L-GOTO

GOTO-N_GOTO-2

2025-01-15 21:42:56 - 2025-01-15 21:42:56

2460691.404821 - 2460691.404821

1

Photometry

ID	Obs-date	JD	Mag. / Flux	Err	Lim. Mag./Flux	Units	Filter	Tel / Inst	Exp-time	Observer/s	Remarks
464617	2025-01-15 21:42:56	2460691.404821			19	ABMag	L-GOTO	GOTO-N_GOTO-2	180		[Last non detection]

cyan-ATLAS

ATLAS-CHL_ATLAS-04

2025-01-20 02:09:54 - 2025-01-20 02:09:54

2460695.59021 - 2460695.59021

1

Photometry

ID	Obs-date	JD	Mag. / Flux	Err	Lim. Mag./Flux	Units	Filter	Tel / Inst	Exp-time	Observer/s	Remarks
463829	2025-01-20 02:09:54	2460695.59021			19.33	ABMag	cyan-ATLAS	ATLAS-CHL_ATLAS-04	30	Robot	[Last non detection]

L-GOTO

GOTO-N_GOTO-1

2025-01-25 20:39:04 - 2025-01-25 20:39:04

2460701.360457 - 2460701.360457

1

Photometry

ID	Obs-date	JD	Mag. / Flux	Err	Lim. Mag./Flux	Units	Filter	Tel / Inst	Exp-time	Observer/s	Remarks
464618	2025-01-25 20:39:04	2460701.360457	17.87	0.06		ABMag	L-GOTO	GOTO-N_GOTO-1	180

r-ZTF

P48_ZTF-Cam

2025-01-24 03:02:36 - 2025-01-24 03:02:36

2460699.6268056 - 2460699.6268056

1

Photometry

ID	Obs-date	JD	Mag. / Flux	Err	Lim. Mag./Flux	Units	Filter	Tel / Inst	Exp-time	Observer/s	Remarks
465713	2025-01-24 03:02:36	2460699.6268056			18.2575	ABMag	r-ZTF	P48_ZTF-Cam			[Last non detection]

g-ZTF

P48_ZTF-Cam

2025-01-24 04:03:42 - 2025-01-31 03:06:11

2460699.6692361 - 2460706.629294

2

Photometry

ID	Obs-date	JD	Mag. / Flux	Err	Lim. Mag./Flux	Units	Filter	Tel / Inst	Exp-time	Observer/s	Remarks
465715	2025-01-31 03:06:11	2460706.629294	17.9695	0.0490094		ABMag	g-ZTF	P48_ZTF-Cam
465714	2025-01-24 04:03:42	2460699.6692361	18.0848	0.109501		ABMag	g-ZTF	P48_ZTF-Cam

cyan-ATLAS

ATLAS-HKO_ATLAS-02

2025-01-21 06:37:40 - 2025-01-21 06:37:40

2460696.77616 - 2460696.77616

1

Photometry

ID	Obs-date	JD	Mag. / Flux	Err	Lim. Mag./Flux	Units	Filter	Tel / Inst	Exp-time	Observer/s	Remarks
463830	2025-01-21 06:37:40	2460696.77616	18.978	0.137	19.48	ABMag	cyan-ATLAS	ATLAS-HKO_ATLAS-02	30	Robot

L-

Other_Other

2025-01-18 14:13:28 - 2025-01-22 14:01:15

2460694.0926859 - 2460698.0842

2

Photometry

ID	Obs-date	JD	Mag. / Flux	Err	Lim. Mag./Flux	Units	Filter	Tel / Inst	Exp-time	Observer/s	Remarks
464027	2025-01-22 14:01:15	2460698.0842	18.2		20	VegaMag	L-	Other_Other	45	Yuan-Sheng Tsai	CDK17"+PlayerOne Poseidon M
464026	2025-01-18 14:13:28	2460694.0926859			20	VegaMag	L-	Other_Other	45	Yuan-Sheng Tsai	[Last non detection] CDK17"+PlayerOne Poseidon M

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

242991

2025-01-31 07:09:13

Fritz

Jesper Sollerman (SU),Christoffer Fremling (Caltech),Daniel Perley (LJMU) et al.

ZTF

ZTF

02:04:18.708

-08:44:27.35

2025-01-24 04:03:41.999

18.0848

g-ZTF

PSN

ZTF25aacxidm

ZTF

N

242433

2025-01-25 21:58:47

GOTO_bot

D. O'Neill,K. Ackley,M. Dyer et al.

GOTO

GOTO

02:04:18.684

-08:44:27.66

2025-01-25 20:39:03.744

17.87

L-GOTO

Other

GOTO25pz

GOTO

N

242116

2025-01-23 08:58:21

Yuan-Sheng Tsai

Yuan-Sheng Tsai et al.

02:04:18.720

-08:44:27.20

2025-01-22 14:01:14.880

18.2

L-

1

PSN

NGC809

N

Related files

File	Comments	Last Modified (UT)	Modified By
tns_2025yn_atrep_242116.png		2025-01-23 08:58:23	Yuan-Sheng Tsai

241968

2025-01-21 10:41:14

ATLAS_Bot1

J. Tonry,L. Denneau,H. Weiland et al.

ATLAS

ATLAS

02:04:18.708

-08:44:27.50

2025-01-21 06:37:40.224

18.978

cyan-ATLAS

PSN

ATLAS25apx

ATLAS

2025TNSTR.282....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

20230

2025-01-24 15:58:54

ePESSTOplus_Bot1

Simon de Wet, Hannah Wichern, Giorgos Leloudas, O. Yaron on behalf of ePESSTO+

ePESSTO+

SN II

0.017

1

ePESSTO+

2025TNSCR.337....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
20230	2025-01-24 01:07:11	ESO-NTT / EFOSC2-NTT	899	Simon de Wet, Hannah Wichern	Giorgos Leloudas	ePESSTO+	tns_2025yn_2025-01-24_01-07-11_ESO-NTT_EFOSC2-NTT_ePESSTO+.asci	tns_2025yn_2025-01-24_01-07-11_ESO-NTT_EFOSC2-NTT_ePESSTO+.fits	Object

Comments

Object coordinates updated

Object coordinates updated according to AT-report 242991 of Group ZTF
Previous RA, DEC: 02:04:18.708, -08:44:27.50 (31.07795125, -8.7409725)
Updated RA, DEC: 02:04:18.708, -08:44:27.35 (31.0779519, -8.7409293)

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