2025kiu | Transient Name Server

RA/DEC (2000)

01:20:05.830 -33:53:51.10

20.024292 -33.897528

Type

SN Ia

Redshift

0.03

Discovery Report Classification Report

Related AstroNotes: 2025-145

Reporting Group

ATLAS

Discovering Data Source

ATLAS

Discovery Date

2025-05-11 09:03:00.576

TNS AT

Y

Public

Y

Discovery Mag

17.097

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
	21025	2025-05-13 04:03:00	Lesedi / Mookodi	600	N. Erasmus, S. Potter, C. van Gend, H. Worters, S. Chandra, D. Cunnama, M. Hlakola, P. Rabe, R. Julie (all SAAO)	Simon de Wet	BlackGEM	tns_2025kiu_2025-05-13_04-03-00.170_Lesedi_Mookodi_BlackGEM.csv		Object			The spectrum was taken with the SAAO's 1-m Lesedi telescope with the Mookodi low-resolution spectrograph and imager [1] as part of the “IO” rapid follow-up program [2]. The spectrum was taken with the widest (4") slit width which resulted in a spectral resolution of R ~ 200 at 6000 Angstrom. [1] https://doi.org/10.1117/1.JATIS.10.2.025005 [2] https://doi.org/10.1117/12.3015250
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 The spectrum was taken with the SAAO's 1-m Lesedi telescope with the Mookodi low-resolution spectrograph and imager [1] as part of the “IO” rapid follow-up program [2]. The spectrum was taken with the widest (4") slit width which resulted in a spectral resolution of R ~ 200 at 6000 Angstrom. [1] https://doi.org/10.1117/1.JATIS.10.2.025005 [2] https://doi.org/10.1117/12.3015250

Light Curves

Filter

Tel / Inst

Obs-date range

JD Range

Photometry

L-GOTO

GOTO-S_GOTO-4

2025-01-30 10:18:15 - 2025-01-30 10:18:15

2460705.92934 - 2460705.92934

1

Photometry

ID	Obs-date	JD	Mag. / Flux	Err	Lim. Mag./Flux	Units	Filter	Tel / Inst	Exp-time	Observer/s	Remarks
488752	2025-01-30 10:18:15	2460705.92934			19.5	ABMag	L-GOTO	GOTO-S_GOTO-4	180		[Last non detection]

L-GOTO

GOTO-S_GOTO-3

2025-05-17 19:37:32 - 2025-05-17 19:37:32

2460813.31773 - 2460813.31773

1

Photometry

ID	Obs-date	JD	Mag. / Flux	Err	Lim. Mag./Flux	Units	Filter	Tel / Inst	Exp-time	Observer/s	Remarks
488753	2025-05-17 19:37:32	2460813.31773	14.88	0.02		ABMag	L-GOTO	GOTO-S_GOTO-3	180

orange-ATLAS

ATLAS-CHL_ATLAS-04

2025-02-19 01:21:09 - 2025-05-11 09:03:01

2460725.55635 - 2460806.87709

2

Photometry

ID	Obs-date	JD	Mag. / Flux	Err	Lim. Mag./Flux	Units	Filter	Tel / Inst	Exp-time	Observer/s	Remarks
487834	2025-05-11 09:03:01	2460806.87709	17.097	0.11	17.88	ABMag	orange-ATLAS	ATLAS-CHL_ATLAS-04	30	Robot
487833	2025-02-19 01:21:09	2460725.55635			19.01	ABMag	orange-ATLAS	ATLAS-CHL_ATLAS-04	30	Robot	[Last non detection]

BG-q-BlackGem

BG3_BlackGEM-Cam3

2025-05-23 10:06:16 - 2025-05-23 10:06:16

2460818.9210185 - 2460818.9210185

1

Photometry

ID	Obs-date	JD	Mag. / Flux	Err	Lim. Mag./Flux	Units	Filter	Tel / Inst	Exp-time	Observer/s	Remarks
490841	2025-05-23 10:06:16	2460818.9210185	14.44	0.02	20.62	ABMag	BG-q-BlackGem	BG3_BlackGEM-Cam3	60	robotic

BG-q-BlackGem

BG2_BlackGEM-Cam2

2025-01-08 00:59:43 - 2025-01-08 00:59:43

2460683.5414699 - 2460683.5414699

1

Photometry

ID	Obs-date	JD	Mag. / Flux	Err	Lim. Mag./Flux	Units	Filter	Tel / Inst	Exp-time	Observer/s	Remarks
490840	2025-01-08 00:59:43	2460683.5414699			20	ABMag	BG-q-BlackGem	BG2_BlackGEM-Cam2	60	robotic	[Last non detection]

Other-

Other_Other

2017-09-25 03:38:35 - 2025-05-12 09:22:41

2458021.65179 - 2460807.89075

3

Photometry

ID	Obs-date	JD	Mag. / Flux	Err	Lim. Mag./Flux	Units	Filter	Tel / Inst	Exp-time	Observer/s	Remarks
487940	2025-05-12 09:22:41	2460807.89075	16.3		19.2	VegaMag	Other-	Other_Other	60	Robot	MASTER-OAFA
487939	2025-05-12 09:21:26	2460807.88988	16.2		19.2	VegaMag	Other-	Other_Other	60	Robot	MASTER-OAFA
487938	2017-09-25 03:38:35	2458021.65179			20.7	VegaMag	Other-	Other_Other	180	Robot	[Last non detection] MASTER-OAFA

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

256354

2025-05-24 09:56:02

BlackGEM_Bot1

F. Stoppa,H. Tranin,D. Pieterse et al.

BlackGEM

BlackGEM

01:20:05.830

-33:53:51.10

2025-05-23 10:06:16.000

14.44

BG-q-BlackGem

1

PSN

BGEM J012005.83-335351.1

BlackGEM

N

Related files

File	Comments	Last Modified (UT)	Modified By
tns_2025kiu_atrep_256354_BlackGEM.pdf	Finding Chart	2025-05-24 09:56:04	BlackGEM_Bot1

255262

2025-05-17 20:26:34

GOTO_bot

A. Kumar,K. Ackley,M. Dyer et al.

GOTO

GOTO

01:20:05.818

-33:53:50.76

2025-05-17 19:37:31.872

14.88

L-GOTO

Other

GOTO25cst

GOTO

N

254845

2025-05-12 12:22:55

MASTER

Ya.Kechin,V.Lipunov,E.Gorbovskoy et al.

MASTER

MASTER

01:20:05.850

-33:53:52.10

2025-05-12 09:21:25.632

16.2

Other-

PSN

MASTER OT J012005.85-335352.1

MASTER

N

254769

2025-05-11 12:50:24

ATLAS_Bot1

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

ATLAS

ATLAS

01:20:05.809

-33:53:50.76

2025-05-11 09:03:00.576

17.097

orange-ATLAS

PSN

ATLAS25exz

ATLAS

2025TNSTR1748....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

21025

2025-05-13 09:32:07

Simon de Wet

Simon 'de Wet'

BlackGEM

SN Ia

0.03

1

BlackGEM, MeerLICHT

Spectral template matching with NGSF shows a match to a SN Ia at z=0.03.

2025TNSCR1773....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
21025	2025-05-13 04:03:00	Lesedi / Mookodi	600	N. Erasmus, S. Potter, C. van Gend, H. Worters, S. Chandra, D. Cunnama, M. Hlakola, P. Rabe, R. Julie (all SAAO)	Simon de Wet	BlackGEM	tns_2025kiu_2025-05-13_04-03-00.170_Lesedi_Mookodi_BlackGEM.csv		Object			The spectrum was taken with the SAAO's 1-m Lesedi telescope with the Mookodi low-resolution spectrograph and imager [1] as part of the “IO” rapid follow-up program [2]. The spectrum was taken with the widest (4") slit width which resulted in a spectral resolution of R ~ 200 at 6000 Angstrom. [1] https://doi.org/10.1117/1.JATIS.10.2.025005 [2] https://doi.org/10.1117/12.3015250

Comments

Object coordinates updated

Object coordinates updated according to AT-report 256354 of Group BlackGEM
Previous RA, DEC: 01:20:05.809, -33:53:50.76 (20.0242055556, -33.8974322222)
Updated RA, DEC: 01:20:05.830, -33:53:51.10 (20.024292, -33.897528)

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