2025zgu | Transient Name Server

RA/DEC (2000)

03:46:34.772 -04:27:47.36

56.6448838387 -4.46315587427

Type

SN Ia

Redshift

0.012669

Discovery Report Classification Report

Reporting Group

ATLAS

Discovering Data Source

ATLAS

Discovery Date

2025-09-30 03:09:07.776

TNS AT

Y

Public

Y

Discovery Mag

18.796

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

▌

ATLAS-TDO_ATLAS-05_wide

▌

GOTO-S_GOTO-3_L

▌

PS2_GPC2_w

▌

GOTO-N_GOTO-1_L

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
	22162	2025-10-02 13:53:05	Gemini-N / GMOS		Queue	Nabeel Rehemtulla, Hanindyo Kuncarayakti	None	tns_2025zgu_2025-10-02_13-53-05_Gemini-N_GMOS_None.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

wide-ATLAS

ATLAS-TDO_ATLAS-05

2025-09-29 05:33:31 - 2025-09-30 03:09:08

2460947.73161 - 2460948.63134

2

Photometry

ID	Obs-date	JD	Mag. / Flux	Err	Lim. Mag./Flux	Units	Filter	Tel / Inst	Exp-time	Observer/s	Remarks
521433	2025-09-30 03:09:08	2460948.63134	18.796	0.146	20.13	ABMag	wide-ATLAS	ATLAS-TDO_ATLAS-05	30	Robot
521432	2025-09-29 05:33:31	2460947.73161			19.8	ABMag	wide-ATLAS	ATLAS-TDO_ATLAS-05	30	Robot	[Last non detection]

L-GOTO

GOTO-S_GOTO-3

2025-09-28 15:53:12 - 2025-09-28 15:53:12

2460947.161947 - 2460947.161947

1

Photometry

ID	Obs-date	JD	Mag. / Flux	Err	Lim. Mag./Flux	Units	Filter	Tel / Inst	Exp-time	Observer/s	Remarks
521858	2025-09-28 15:53:12	2460947.161947	19.79	0.19		ABMag	L-GOTO	GOTO-S_GOTO-3	180

w-P1

PS2_GPC2

2025-09-29 13:22:30 - 2025-09-29 13:22:30

2460948.05729 - 2460948.05729

1

Photometry

ID	Obs-date	JD	Mag. / Flux	Err	Lim. Mag./Flux	Units	Filter	Tel / Inst	Exp-time	Observer/s	Remarks
521767	2025-09-29 13:22:30	2460948.05729	19.36	0.04	22	ABMag	w-P1	PS2_GPC2	45	Robot

L-GOTO

GOTO-N_GOTO-1

2025-09-27 03:05:47 - 2025-09-27 03:05:47

2460945.629024 - 2460945.629024

1

Photometry

ID	Obs-date	JD	Mag. / Flux	Err	Lim. Mag./Flux	Units	Filter	Tel / Inst	Exp-time	Observer/s	Remarks
521857	2025-09-27 03:05:47	2460945.629024			20	ABMag	L-GOTO	GOTO-N_GOTO-1	360		[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
272311	2025-10-02 10:28:24	GOTO_bot	G. Ramsay, D. O'Neill, K. Ackley et al.	GOTO	GOTO	03:46:34.816	-04:27:47.68	2025-09-28 15:53:12.480	19.79	L-GOTO		Other		GOTO25iel	GOTO				N
272271	2025-10-01 21:50:39	PS1_Bot1	K. C. Chambers, T. de Boer, J. Fairlamb et al.	Pan-STARRS	Pan-STARRS	03:46:34.772	-04:27:47.36	2025-09-29 13:22:29.856	19.36	w-P1		PSN		PS25hry	Pan-STARRS				N
272130	2025-10-01 07:55:13	ATLAS_Bot1	J. Tonry, L. Denneau, H. Weiland et al.	ATLAS	ATLAS	03:46:34.767	-04:27:47.52	2025-09-30 03:09:07.776	18.796	wide-ATLAS		PSN		ATLAS25mgc	ATLAS			2025TNSTR3942....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

22162

2025-10-06 15:09:51

Nabeel Rehemtulla

Nabeel Rehemtulla (Northwestern), Keiichi Maeda (Kyoto University), Hanindyo Kuncarayakti (University of Turku), Wynn Jacobson-Galán (Caltech), Adam A. Miller (Northwestern)

None

SN Ia

0.012669

1

Highly reddened, young SN Ia

2025TNSCR4023....1R

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
22162	2025-10-02 13:53:05	Gemini-N / GMOS		Queue	Nabeel Rehemtulla, Hanindyo Kuncarayakti	None	tns_2025zgu_2025-10-02_13-53-05_Gemini-N_GMOS_None.txt		Object

Comments

Object coordinates updated

Object coordinates updated according to AT-report 272271 of Group Pan-STARRS
Previous RA, DEC: 03:46:34.767, -04:27:47.52 (56.6448633333, -4.46320111111)
Updated RA, DEC: 03:46:34.772, -04:27:47.36 (56.6448838387, -4.46315587427)

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