2025adhf | Transient Name Server

RA/DEC (2000)

02:43:44.411 -55:19:06.44

40.935046 -55.318456

Type

SN Ia

Redshift

0.098

Discovery Report Classification Report

Reporting Group

ATLAS

Discovering Data Source

ATLAS

Discovery Date

2025-11-13 01:37:58.656

TNS AT

Y

Public

Y

Discovery Mag

18.85

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), 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
	22425	2025-11-17 07:04:52	SOAR / Goodman	1800	Andre Santos	Charles Kilpatrick	STEP	tns_2025adhf_2025-11-17_07-04-52_SOAR_Goodman_STEP.flm		Object			Using SNID (Blondin & Tonry 2007, ApJ, 666, 1024) and SNID-SAGE (Stoppa 2025), we find good matches to SN Ia a few days before maximum light (e.g., SN 2006S at z ~0.098 and -5.5d from maximum).
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 Using SNID (Blondin & Tonry 2007, ApJ, 666, 1024) and SNID-SAGE (Stoppa 2025), we find good matches to SN Ia a few days before maximum light (e.g., SN 2006S at z ~0.098 and -5.5d from maximum).

Light Curves

Filter

Tel / Inst

Obs-date range

JD Range

Photometry

L-GOTO

GOTO-S_GOTO-4

2025-11-02 11:49:35 - 2025-11-12 16:23:29

2460981.99277 - 2460992.182982

2

Photometry

ID	Obs-date	JD	Mag. / Flux	Err	Lim. Mag./Flux	Units	Filter	Tel / Inst	Exp-time	Observer/s	Remarks
530965	2025-11-12 16:23:29	2460992.182982	19.2	0.12		ABMag	L-GOTO	GOTO-S_GOTO-4	240
530964	2025-11-02 11:49:35	2460981.99277			19.2	ABMag	L-GOTO	GOTO-S_GOTO-4	180		[Last non detection]

cyan-ATLAS

ATLAS-CHL_ATLAS-04

2025-11-12 04:59:47 - 2025-11-12 04:59:47

2460991.70818 - 2460991.70818

1

Photometry

ID	Obs-date	JD	Mag. / Flux	Err	Lim. Mag./Flux	Units	Filter	Tel / Inst	Exp-time	Observer/s	Remarks
530853	2025-11-12 04:59:47	2460991.70818			19.39	ABMag	cyan-ATLAS	ATLAS-CHL_ATLAS-04	30	Robot	[Last non detection]

orange-ATLAS

ATLAS-STH_ATLAS-03

2025-11-13 01:37:59 - 2025-11-13 01:37:59

2460992.56804 - 2460992.56804

1

Photometry

ID	Obs-date	JD	Mag. / Flux	Err	Lim. Mag./Flux	Units	Filter	Tel / Inst	Exp-time	Observer/s	Remarks
530854	2025-11-13 01:37:59	2460992.56804	18.85	0.301	19.96	ABMag	orange-ATLAS	ATLAS-STH_ATLAS-03	110	Robot

BG-q-BlackGem

BG4_BlackGEM-Cam4

2025-11-13 03:04:29 - 2025-11-13 03:04:29

2460992.6281134 - 2460992.6281134

1

Photometry

ID	Obs-date	JD	Mag. / Flux	Err	Lim. Mag./Flux	Units	Filter	Tel / Inst	Exp-time	Observer/s	Remarks
530885	2025-11-13 03:04:29	2460992.6281134	19.34	0.13	21.02	ABMag	BG-q-BlackGem	BG4_BlackGEM-Cam4	60	robotic

BG-q-BlackGem

ML1_MeerLICHT-Cam

2020-03-24 12:27:22 - 2020-03-24 12:27:22

2458933.0190046 - 2458933.0190046

1

Photometry

ID	Obs-date	JD	Mag. / Flux	Err	Lim. Mag./Flux	Units	Filter	Tel / Inst	Exp-time	Observer/s	Remarks
530884	2020-03-24 12:27:22	2458933.0190046			20.27	ABMag	BG-q-BlackGem	ML1_MeerLICHT-Cam	60	robotic	[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
276699	2025-11-14 11:07:03	GOTO_bot	G. Ramsay,K. Ackley,M. Dyer et al.	GOTO	GOTO	02:43:44.460	-55:19:05.92	2025-11-12 16:23:29.472	19.2	L-GOTO		Other		GOTO25jyo	GOTO				N
276664	2025-11-13 16:13:11	BlackGEM_Bot1	H. Tranin,F. Stoppa,D. Pieterse et al.	BlackGEM	BlackGEM	02:43:44.411	-55:19:06.44	2025-11-13 03:04:29.000	19.34	BG-q-BlackGem		PSN		BGEM J024344.41-551906.4	BlackGEM				N
276651	2025-11-13 12:56:41	ATLAS_Bot1	J. Tonry,L. Denneau,H. Weiland et al.	ATLAS	ATLAS	02:43:44.395	-55:19:05.95	2025-11-13 01:37:58.656	18.85	orange-ATLAS		PSN		ATLAS25ofn	ATLAS			2025TNSTR4551....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

22424

2025-11-17 16:56:36

Charles Kilpatrick

Charles Kilpatrick (Northwestern), Andre Santos (CBPF), Clecio Bom (CBPF), on behalf of STEP

STEP

SN Ia

0.098

1

STEP

2025TNSCR4628....1K

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
22425	2025-11-17 07:04:52	SOAR / Goodman	1800	Andre Santos	Charles Kilpatrick	STEP	tns_2025adhf_2025-11-17_07-04-52_SOAR_Goodman_STEP.flm		Object			Using SNID (Blondin & Tonry 2007, ApJ, 666, 1024) and SNID-SAGE (Stoppa 2025), we find good matches to SN Ia a few days before maximum light (e.g., SN 2006S at z ~0.098 and -5.5d from maximum).

Comments

Object coordinates updated

Object coordinates updated according to AT-report 276664 of Group BlackGEM
Previous RA, DEC: 02:43:44.395, -55:19:05.95 (40.9349795, -55.3183185)
Updated RA, DEC: 02:43:44.411, -55:19:06.44 (40.935046, -55.318456)

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