2025cy | Transient Name Server

RA/DEC (2000)

13:21:13.460 -43:41:01.07

200.306083355 -43.6836311251

Type

SN Ia

Redshift

0.01

Discovery Report Classification Report

Reporting Group

BlackGEM

Discovering Data Source

BlackGEM

Discovery Date

2025-01-01 07:46:35.000

TNS AT

Y

Public

Y

Discovery Mag

18.03

Filter

BG-q-BlackGem

Reporter/s

H. Tranin, F. Stoppa, D. Pieterse, G. Ramsay, S. Faris, P. Groot, P. Vreeswijk, N. Blagorodnova, J. van Roestel, H. Wichern, S. Scaringi

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
	20217	2025-01-22 23:02:06	Lesedi / Mookodi	600	N. Erasmus, S. Potter, C. van Gend, H. Worters, S. Chandra, D. Cunnama, M. Hlakola, P. Rabe, R. Julie (all SAAO)	N. Erasmus, D. Cunnama, S. Potter (all SAAO)	SAAO IO	tns_2025cy_2025-01-22_23-02-06_Lesedi_Mookodi_SAAO_IO.flm		Object			The spectrum was taken with the SAAO's 1-m Lesedi robotic 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 robotic 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
	20039	2025-01-06 00:09:57	Lesedi / Mookodi	900	Simon de Wet	Simon de Wet	BlackGEM	tns_2025cy_2025-01-06_00-09-57.080_Lesedi_Mookodi_BlackGEM.csv		Object			The spectrum was obtained with the fully-robotic SAAO 1-m Lesedi telescope equipped with the Mookodi low-resolution (R~172) spectrograph and imager. We acknowledge the SAAO IO team including S. Potter, N. Erasmus, C. van Gend, S. Chandra, H. Worters, M. Hlakola and R. Julie for their role in these making these observations possible.
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 obtained with the fully-robotic SAAO 1-m Lesedi telescope equipped with the Mookodi low-resolution (R~172) spectrograph and imager. We acknowledge the SAAO IO team including S. Potter, N. Erasmus, C. van Gend, S. Chandra, H. Worters, M. Hlakola and R. Julie for their role in these making these observations possible.

Light Curves

Filter

Tel / Inst

Obs-date range

JD Range

Photometry

L-GOTO

GOTO-S_GOTO-4

2025-01-03 17:54:01 - 2025-01-03 17:54:01

2460679.245846 - 2460679.245846

1

Photometry

ID	Obs-date	JD	Mag. / Flux	Err	Lim. Mag./Flux	Units	Filter	Tel / Inst	Exp-time	Observer/s	Remarks
462402	2025-01-03 17:54:01	2460679.245846	16.84	0.02		ABMag	L-GOTO	GOTO-S_GOTO-4	180

L-GOTO

GOTO-S_GOTO-3

2024-12-25 17:01:34 - 2024-12-25 17:01:34

2460670.209417 - 2460670.209417

1

Photometry

ID	Obs-date	JD	Mag. / Flux	Err	Lim. Mag./Flux	Units	Filter	Tel / Inst	Exp-time	Observer/s	Remarks
462401	2024-12-25 17:01:34	2460670.209417			19.2	ABMag	L-GOTO	GOTO-S_GOTO-3	90		[Last non detection]

orange-ATLAS

ATLAS-CHL_ATLAS-04

2024-09-14 23:58:12 - 2025-01-21 05:36:03

2460568.49875 - 2460696.73337

2

Photometry

ID	Obs-date	JD	Mag. / Flux	Err	Lim. Mag./Flux	Units	Filter	Tel / Inst	Exp-time	Observer/s	Remarks
463817	2025-01-21 05:36:03	2460696.73337	15.212	0.015	18.84	ABMag	orange-ATLAS	ATLAS-CHL_ATLAS-04	30	Robot
463816	2024-09-14 23:58:12	2460568.49875			18.32	ABMag	orange-ATLAS	ATLAS-CHL_ATLAS-04	30	Robot	[Last non detection]

BG-q-BlackGem

BG4_BlackGEM-Cam4

2024-12-29 08:03:14 - 2024-12-29 08:03:14

2460673.8355787 - 2460673.8355787

1

Photometry

ID	Obs-date	JD	Mag. / Flux	Err	Lim. Mag./Flux	Units	Filter	Tel / Inst	Exp-time	Observer/s	Remarks
461093	2024-12-29 08:03:14	2460673.8355787			21.33	ABMag	BG-q-BlackGem	BG4_BlackGEM-Cam4	60	robotic	[Last non detection]

BG-q-BlackGem

BG3_BlackGEM-Cam3

2025-01-01 07:46:35 - 2025-01-01 07:46:35

2460676.8240162 - 2460676.8240162

1

Photometry

ID	Obs-date	JD	Mag. / Flux	Err	Lim. Mag./Flux	Units	Filter	Tel / Inst	Exp-time	Observer/s	Remarks
461094	2025-01-01 07:46:35	2460676.8240162	18.03	0.03	21.18	ABMag	BG-q-BlackGem	BG3_BlackGEM-Cam3	60	robotic

w-P1

PS1_GPC1

2025-02-08 14:06:42 - 2025-02-08 14:06:42

2460715.08799 - 2460715.08799

1

Photometry

ID	Obs-date	JD	Mag. / Flux	Err	Lim. Mag./Flux	Units	Filter	Tel / Inst	Exp-time	Observer/s	Remarks
474134	2025-02-08 14:06:42	2460715.08799	16.5	0	22	ABMag	w-P1	PS1_GPC1	45	Robot

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

247141

2025-03-08 21:30:16

PS1_Bot1

K. C. Chambers,T. de Boer,J. Fairlamb et al.

Pan-STARRS

Pan-STARRS

13:21:13.460

-43:41:01.07

2025-02-08 14:06:42.336

16.5

w-P1

PSN

PS25zu

Pan-STARRS

N

241961

2025-01-21 08:29:19

ATLAS_Bot1

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

ATLAS

ATLAS

13:21:13.463

-43:41:00.89

2025-01-21 05:36:03.168

15.212

orange-ATLAS

PSN

ATLAS25apw

ATLAS

N

241162

2025-01-16 10:47:01

GOTO_bot

D. Steeghs,D. O'Neill,K. Ackley et al.

GOTO

GOTO

13:21:13.483

-43:41:01.14

2025-01-03 17:54:01.440

16.84

L-GOTO

Other

GOTO25bl

GOTO

N

240542

2025-01-06 09:52:21

BlackGEM_Bot1

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

BlackGEM

BlackGEM

13:21:13.448

-43:41:01.16

2025-01-01 07:46:35.000

18.03

BG-q-BlackGem

1

PSN

BGEM J132113.44-434101.1

BlackGEM

2025TNSTR..66....1T

N

Related files

File	Comments	Last Modified (UT)	Modified By
tns_2025cy_atrep_240542.pdf	Finder chart	2025-01-06 09:54:50	BlackGEM_Bot1

Classification Reports

ID

Time received (UT)

Sender

Classifier/s

Group

Classification

Redshift

Spectra

Related files

Assoc. Groups

End prop. period

Remarks

ADS Bibcode

20217

2025-01-23 06:51:12

io robot

N. Erasmus (South African Astronomical Observatory, Stellenbosch University), D. Cunnama (South African Astronomical Observatory), S. Potter (South African Astronomical Observatory, University of Johannesburg)

SAAO IO

SN Ia

0.01

1

1

SAAO IO

Spectral template matching using NGSF (D. A. Howell et al. 2005 and S. Goldwasser et al. 2022) shows a good match with a Type Ia supernova. The reported redshift is estimated from NGSF.

2025TNSCR.323....1E

Related files

File	Comments	Last Modified (UT)	Modified By
tns_2025cy_atrep_20217_SAAO_IO.pdf	The plot shows the best-fit from NGSF.	2025-01-23 06:51:12	io robot

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
20217	2025-01-22 23:02:06	Lesedi / Mookodi	600	N. Erasmus, S. Potter, C. van Gend, H. Worters, S. Chandra, D. Cunnama, M. Hlakola, P. Rabe, R. Julie (all SAAO)	N. Erasmus, D. Cunnama, S. Potter (all SAAO)	SAAO IO	tns_2025cy_2025-01-22_23-02-06_Lesedi_Mookodi_SAAO_IO.flm		Object			The spectrum was taken with the SAAO's 1-m Lesedi robotic 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

20039

2025-01-06 10:17:15

Simon de Wet

Simon de Wet

BlackGEM

SN Ia

0.011

1

BlackGEM

Next Generation SuperFit (NGSF) shows that the spectrum matches a SN 2011fe spectrum at 15 days before peak brightness.

2025TNSCR..80....1D

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
20039	2025-01-06 00:09:57	Lesedi / Mookodi	900	Simon de Wet	Simon de Wet	BlackGEM	tns_2025cy_2025-01-06_00-09-57.080_Lesedi_Mookodi_BlackGEM.csv		Object			The spectrum was obtained with the fully-robotic SAAO 1-m Lesedi telescope equipped with the Mookodi low-resolution (R~172) spectrograph and imager. We acknowledge the SAAO IO team including S. Potter, N. Erasmus, C. van Gend, S. Chandra, H. Worters, M. Hlakola and R. Julie for their role in these making these observations possible.

Comments

Object coordinates updated

Object coordinates updated according to AT-report 247141 of Group Pan-STARRS
Previous RA, DEC: 13:21:13.448, -43:41:01.16 (200.306033, -43.683656)
Updated RA, DEC: 13:21:13.460, -43:41:01.07 (200.306083355, -43.6836311251)

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