2025swg | Transient Name Server

RA/DEC (2000)

03:39:18.633 -04:37:08.21

54.827638 -4.618947

Type

SN Ia

Redshift

0.068

Discovery Report Classification Report

Related AstroNotes: 2025-252

Reporting Group

ATLAS

Discovering Data Source

ATLAS

Discovery Date

2025-07-29 03:46:34.176

TNS AT

Y

Public

Y

Discovery Mag

18.381

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 (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
	21751	2025-08-11 09:10:19	ESO-NTT / EFOSC2-NTT	600	Joyce Naomi Dominique van Dalen, Daniele Bjørn Malesani	Antonio Martin-Carrillo, Gregory Corcoran, Laura Cotter	ePESSTO+	tns_2025swg_2025-08-11_09-10-19_ESO-NTT_EFOSC2-NTT_ePESSTO+.asci	tns_2025swg_2025-08-11_09-10-19_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-S_GOTO-4

2025-07-13 19:20:24 - 2025-07-13 19:20:24

2460870.305827 - 2460870.305827

1

Photometry

ID	Obs-date	JD	Mag. / Flux	Err	Lim. Mag./Flux	Units	Filter	Tel / Inst	Exp-time	Observer/s	Remarks
508302	2025-07-13 19:20:24	2460870.305827			18.9	ABMag	L-GOTO	GOTO-S_GOTO-4	180		[Last non detection]

L-GOTO

GOTO-S_GOTO-3

2025-08-12 18:12:56 - 2025-08-12 18:12:56

2460900.258979 - 2460900.258979

1

Photometry

ID	Obs-date	JD	Mag. / Flux	Err	Lim. Mag./Flux	Units	Filter	Tel / Inst	Exp-time	Observer/s	Remarks
508303	2025-08-12 18:12:56	2460900.258979	17.51	0.04		ABMag	L-GOTO	GOTO-S_GOTO-3	180

cyan-ATLAS

ATLAS-CHL_ATLAS-04

2025-07-23 10:35:22 - 2025-07-23 10:35:22

2460879.94123 - 2460879.94123

1

Photometry

ID	Obs-date	JD	Mag. / Flux	Err	Lim. Mag./Flux	Units	Filter	Tel / Inst	Exp-time	Observer/s	Remarks
506621	2025-07-23 10:35:22	2460879.94123			18.84	ABMag	cyan-ATLAS	ATLAS-CHL_ATLAS-04	30	Robot	[Last non detection]

orange-ATLAS

ATLAS-STH_ATLAS-03

2025-07-29 03:46:34 - 2025-07-29 03:46:34

2460885.65734 - 2460885.65734

1

Photometry

ID	Obs-date	JD	Mag. / Flux	Err	Lim. Mag./Flux	Units	Filter	Tel / Inst	Exp-time	Observer/s	Remarks
506622	2025-07-29 03:46:34	2460885.65734	18.381	0.12	19.03	ABMag	orange-ATLAS	ATLAS-STH_ATLAS-03	30	Robot

BG-q-BlackGem

BG3_BlackGEM-Cam3

2025-07-23 08:35:32 - 2025-07-23 08:35:32

2460879.8580093 - 2460879.8580093

1

Photometry

ID	Obs-date	JD	Mag. / Flux	Err	Lim. Mag./Flux	Units	Filter	Tel / Inst	Exp-time	Observer/s	Remarks
509048	2025-07-23 08:35:32	2460879.8580093			19.93	ABMag	BG-q-BlackGem	BG3_BlackGEM-Cam3	60	robotic	[Last non detection]

BG-q-BlackGem

BG2_BlackGEM-Cam2

2025-07-29 09:25:08 - 2025-07-29 09:25:08

2460885.8924537 - 2460885.8924537

1

Photometry

ID	Obs-date	JD	Mag. / Flux	Err	Lim. Mag./Flux	Units	Filter	Tel / Inst	Exp-time	Observer/s	Remarks
509049	2025-07-29 09:25:08	2460885.8924537	18.41	0.05	20.27	ABMag	BG-q-BlackGem	BG2_BlackGEM-Cam2	60	robotic

r-ZTF

P48_ZTF-Cam

2025-08-21 09:58:45 - 2025-08-27 09:53:48

2460908.9157986 - 2460914.9123611

2

Photometry

ID	Obs-date	JD	Mag. / Flux	Err	Lim. Mag./Flux	Units	Filter	Tel / Inst	Exp-time	Observer/s	Remarks
512767	2025-08-27 09:53:48	2460914.9123611	17.9356	0.0478611		ABMag	r-ZTF	P48_ZTF-Cam
512766	2025-08-21 09:58:45	2460908.9157986	17.7425	0.0550869		ABMag	r-ZTF	P48_ZTF-Cam

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

267860

2025-08-27 11:01:11

Fritz

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

ZTF

ZTF

03:39:18.636

-04:37:08.24

2025-08-21 09:58:44.999

17.7425

r-ZTF

PSN

ZTF25abkjbyy

ZTF

N

265957

2025-08-15 17:44:02

BlackGEM_Bot1

J. A. Paice,H. Tranin,F. Stoppa et al.

BlackGEM

BlackGEM

03:39:18.633

-04:37:08.21

2025-07-29 09:25:08.000

18.41

BG-q-BlackGem

1

PSN

BGEM J033918.63-043708.2

BlackGEM

N

Related files

File	Comments	Last Modified (UT)	Modified By
tns_2025swg_atrep_265957_BlackGEM.pdf	Finding Chart	2025-08-15 17:44:04	BlackGEM_Bot1

265581

2025-08-12 19:38:11

GOTO_bot

A. Kumar,D. O'Neill,K. Ackley et al.

GOTO

GOTO

03:39:18.636

-04:37:08.14

2025-08-12 18:12:55.872

17.51

L-GOTO

Other

GOTO25ftb

GOTO

N

264583

2025-08-01 13:31:35

ATLAS_Bot1

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

ATLAS

ATLAS

03:39:18.662

-04:37:07.84

2025-07-29 03:46:34.176

18.381

orange-ATLAS

PSN

ATLAS25isd

ATLAS

2025TNSTR3022....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

21751

2025-08-11 16:13:54

ePESSTOplus_Bot1

Joyce Naomi Dominique van Dalen, Daniele Bjørn Malesani, Antonio Martin-Carrillo, Gregory Corcoran, Laura Cotter, A. Horowicz on behalf of ePESSTO+

ePESSTO+

SN Ia

0.068

1

ePESSTO+

2025TNSCR3147....1v

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
21751	2025-08-11 09:10:19	ESO-NTT / EFOSC2-NTT	600	Joyce Naomi Dominique van Dalen, Daniele Bjørn Malesani	Antonio Martin-Carrillo, Gregory Corcoran, Laura Cotter	ePESSTO+	tns_2025swg_2025-08-11_09-10-19_ESO-NTT_EFOSC2-NTT_ePESSTO+.asci	tns_2025swg_2025-08-11_09-10-19_ESO-NTT_EFOSC2-NTT_ePESSTO+.fits	Object

Comments

Object coordinates updated

Object coordinates updated according to AT-report 265957 of Group BlackGEM
Previous RA, DEC: 03:39:18.662, -04:37:07.84 (54.82776, -4.61884333333)
Updated RA, DEC: 03:39:18.633, -04:37:08.21 (54.827638, -4.618947)

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