2025gtc | Transient Name Server

RA/DEC (2000)

15:06:00.865 +08:12:39.15

226.5036051 +8.2108745

Type

SN Ia

Redshift

0.08

Discovery Report Classification Report

Reporting Group

ATLAS

Discovering Data Source

ATLAS

Discovery Date

2025-04-04 01:26:56.832

TNS AT

Y

Public

Y

Discovery Mag

18.957

Filter

orange-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, 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
	20755	2025-04-12 13:53:58	UH88 / SNIFS	2000	M. E. Huber		SCAT	tns_2025gtc_2025-04-12_13-53-58_UH88_SNIFS_SCAT.dat		Object			Poor dichroic correction for ~495-520 nm
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 Poor dichroic correction for ~495-520 nm

Light Curves

Filter

Tel / Inst

Obs-date range

JD Range

Photometry

L-GOTO

GOTO-S_GOTO-3

2025-03-02 18:03:53 - 2025-03-02 18:03:53

2460737.252697 - 2460737.252697

1

Photometry

ID	Obs-date	JD	Mag. / Flux	Err	Lim. Mag./Flux	Units	Filter	Tel / Inst	Exp-time	Observer/s	Remarks
481212	2025-03-02 18:03:53	2460737.252697			20.5	ABMag	L-GOTO	GOTO-S_GOTO-3	360		[Last non detection]

cyan-ATLAS

ATLAS-CHL_ATLAS-04

2025-04-02 05:25:20 - 2025-04-02 05:25:20

2460767.72593 - 2460767.72593

1

Photometry

ID	Obs-date	JD	Mag. / Flux	Err	Lim. Mag./Flux	Units	Filter	Tel / Inst	Exp-time	Observer/s	Remarks
480725	2025-04-02 05:25:20	2460767.72593			19.27	ABMag	cyan-ATLAS	ATLAS-CHL_ATLAS-04	30	Robot	[Last non detection]

orange-ATLAS

ATLAS-STH_ATLAS-03

2025-04-04 01:26:57 - 2025-04-04 01:26:57

2460769.56038 - 2460769.56038

1

Photometry

ID	Obs-date	JD	Mag. / Flux	Err	Lim. Mag./Flux	Units	Filter	Tel / Inst	Exp-time	Observer/s	Remarks
480726	2025-04-04 01:26:57	2460769.56038	18.957	0.172	19.27	ABMag	orange-ATLAS	ATLAS-STH_ATLAS-03	30	Robot

L-GOTO

GOTO-N_GOTO-1

2025-04-04 02:21:42 - 2025-04-04 02:21:42

2460769.598396 - 2460769.598396

1

Photometry

ID	Obs-date	JD	Mag. / Flux	Err	Lim. Mag./Flux	Units	Filter	Tel / Inst	Exp-time	Observer/s	Remarks
481213	2025-04-04 02:21:42	2460769.598396	19.35	0.19		ABMag	L-GOTO	GOTO-N_GOTO-1	180

r-ZTF

P48_ZTF-Cam

2025-04-07 08:39:18 - 2025-04-08 09:28:32

2460772.860625 - 2460773.8948148

2

Photometry

ID	Obs-date	JD	Mag. / Flux	Err	Lim. Mag./Flux	Units	Filter	Tel / Inst	Exp-time	Observer/s	Remarks
481399	2025-04-08 09:28:32	2460773.8948148	18.9446	0.122816		ABMag	r-ZTF	P48_ZTF-Cam
481398	2025-04-07 08:39:18	2460772.860625	18.8736	0.118677		ABMag	r-ZTF	P48_ZTF-Cam

g-ZTF

P48_ZTF-Cam

2025-04-06 08:05:57 - 2025-04-06 08:05:57

2460771.8374653 - 2460771.8374653

1

Photometry

ID	Obs-date	JD	Mag. / Flux	Err	Lim. Mag./Flux	Units	Filter	Tel / Inst	Exp-time	Observer/s	Remarks
481397	2025-04-06 08:05:57	2460771.8374653			18.8869	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
251218	2025-04-08 11:24:47	Fritz	Jesper Sollerman (SU), Christoffer Fremling (Caltech), Daniel Perley (LJMU) et al.	ZTF	ZTF	15:06:00.865	+08:12:39.15	2025-04-07 08:39:18.000	18.8736	r-ZTF		PSN		ZTF25aaluemf	ZTF				N
251148	2025-04-07 12:13:30	GOTO_bot	A. Kumar, T. Killestein, K. Ackley et al.	GOTO	GOTO	15:06:00.899	+08:12:38.97	2025-04-04 02:21:41.760	19.35	L-GOTO		Other		GOTO25bsz	GOTO		This transient was discovered with the assistance of the GOTO Kilonova Seekers Citizen Scientists on Zooniverse. The candidate was flagged by volunteers: Henryk Krawczyk, Antonio Pasqua, Cledison Marcos da Silva, M.T. Mazzucato, Rosemary Billington		N
250893	2025-04-04 09:03:54	ATLAS_Bot1	J. Tonry, L. Denneau, H. Weiland et al.	ATLAS	ATLAS	15:06:00.873	+08:12:38.83	2025-04-04 01:26:56.832	18.957	orange-ATLAS		PSN		ATLAS25dol	ATLAS			2025TNSTR1263....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

20755

2025-04-13 08:56:48

Mark Huber

M. E. Huber (IfA, UH Manoa) on behalf of the SCAT team

SCAT

SN Ia

0.08

1

ATLAS, SCAT

Spectrum matches type Ia SN around maximum light. Classification, redshift and age from template cross-correlation with SNID (Blondin and Tonry 2007)

2025TNSCR1377....1H

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
20755	2025-04-12 13:53:58	UH88 / SNIFS	2000	M. E. Huber		SCAT	tns_2025gtc_2025-04-12_13-53-58_UH88_SNIFS_SCAT.dat		Object			Poor dichroic correction for ~495-520 nm

Comments

Object coordinates updated

Object coordinates updated according to AT-report 251218 of Group ZTF
Previous RA, DEC: 15:06:00.873, +08:12:38.83 (226.503636667, +8.21078666667)
Updated RA, DEC: 15:06:00.865, +08:12:39.15 (226.5036051, +8.2108745)

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