2025arc | Transient Name Server

RA/DEC (2000)

13:29:19.688 -47:05:55.33

202.332033 -47.098703

Type

SN Ia

Redshift

0.0156

Discovery Report Classification Report

Reporting Group

BlackGEM

Discovering Data Source

BlackGEM

Discovery Date

2025-02-01 08:18:01.000

TNS AT

Public

Discovery Mag

20.65

Filter

BG-q-BlackGem

Reporter/s

F. Stoppa, H. Tranin, 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
	20298	2025-02-04 00:08:00	Lesedi / Mookodi	600	N. Erasmus, S. Potter, C. van Gend, H. Worters, S. Chandra, D. Cunnama, M. Hlakola, P. Rabe, R. Julie (all SAAO)	N. Erasmus, D. Cunnama, S. Potter (all SAAO)	SAAO IO	tns_2025arc_2025-02-04_00-07-59.57_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

Light Curves

Filter

Tel / Inst

Obs-date range

JD Range

Photometry

L-GOTO

GOTO-S_GOTO-4

2025-01-28 14:51:52 - 2025-01-28 14:51:52

2460704.11935 - 2460704.11935

Photometry

ID	Obs-date	JD	Mag. / Flux	Err	Lim. Mag./Flux	Units	Filter	Tel / Inst	Exp-time	Observer/s	Remarks
466261	2025-01-28 14:51:52	2460704.11935			19.8	ABMag	L-GOTO	GOTO-S_GOTO-4	180		[Last non detection]

L-GOTO

GOTO-S_GOTO-3

2025-02-02 16:56:26 - 2025-02-02 16:56:26

2460709.205863 - 2460709.205863

Photometry

ID	Obs-date	JD	Mag. / Flux	Err	Lim. Mag./Flux	Units	Filter	Tel / Inst	Exp-time	Observer/s	Remarks
466262	2025-02-02 16:56:26	2460709.205863	18.92	0.09		ABMag	L-GOTO	GOTO-S_GOTO-3	180

cyan-ATLAS

ATLAS-CHL_ATLAS-04

2025-02-02 07:05:13 - 2025-02-02 07:05:13

2460708.79529 - 2460708.79529

Photometry

ID	Obs-date	JD	Mag. / Flux	Err	Lim. Mag./Flux	Units	Filter	Tel / Inst	Exp-time	Observer/s	Remarks
466456	2025-02-02 07:05:13	2460708.79529	18.898	0.142	19.5	ABMag	cyan-ATLAS	ATLAS-CHL_ATLAS-04	30	Robot

orange-ATLAS

ATLAS-STH_ATLAS-03

2025-01-31 01:13:04 - 2025-01-31 01:13:04

2460706.55074 - 2460706.55074

Photometry

ID	Obs-date	JD	Mag. / Flux	Err	Lim. Mag./Flux	Units	Filter	Tel / Inst	Exp-time	Observer/s	Remarks
466455	2025-01-31 01:13:04	2460706.55074			19.26	ABMag	orange-ATLAS	ATLAS-STH_ATLAS-03	30	Robot	[Last non detection]

BG-q-BlackGem

BG2_BlackGEM-Cam2

2025-01-31 08:23:32 - 2025-02-01 08:18:01

2460706.8496759 - 2460707.8458449

Photometry

ID	Obs-date	JD	Mag. / Flux	Err	Lim. Mag./Flux	Units	Filter	Tel / Inst	Exp-time	Observer/s	Remarks
466205	2025-02-01 08:18:01	2460707.8458449	20.65	0.17	21.23	ABMag	BG-q-BlackGem	BG2_BlackGEM-Cam2	60	robotic
466204	2025-01-31 08:23:32	2460706.8496759			21.31	ABMag	BG-q-BlackGem	BG2_BlackGEM-Cam2	60	robotic	[Last non detection]

AT Reports

Time received (UT)

Sender

Reporter/s

Reporting group

Disc. Data Source

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

243295

2025-02-03 09:01:03

ATLAS_Bot1

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

ATLAS

13:29:19.682

-47:05:55.42

2025-02-02 07:05:13.056

18.898

cyan-ATLAS

PSN

ATLAS25bfo

ATLAS

243222

2025-02-02 17:33:19

GOTO_bot

D. O'Neill, K. Ackley, M. Dyer et al.

GOTO

13:29:19.668

-47:05:55.58

2025-02-02 16:56:26.304

18.92

L-GOTO

Other

GOTO25ym

GOTO

243175

2025-02-02 11:56:03

BlackGEM_Bot1

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

BlackGEM

13:29:19.688

-47:05:55.33

2025-02-01 08:18:01.000

20.65

BG-q-BlackGem

PSN

BGEM J132919.68-470555.3

BlackGEM

2025TNSTR.447....1S

Related files

File	Comments	Last Modified (UT)	Modified By
tns_2025arc_atrep_243175_BlackGEM.pdf	Finding Chart	2025-02-02 11:56:05	BlackGEM_Bot1

Classification Reports

Time received (UT)

Sender

Classifier/s

Group

Classification

Redshift

Spectra

Related files

Assoc. Groups

End prop. period

Remarks

ADS Bibcode

20298

2025-02-04 10:08:25

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), H. Stevance (Oxford)

SAAO IO

SN Ia

0.0156

SAAO IO

Spectral template matching using SNID (Blondin & Tonry 2007) shows a good match with a Type Ia supernova. The reported redshift is derived from published values of the host galaxy.

2025TNSCR.485....1E

Related files

File	Comments	Last Modified (UT)	Modified By
tns_2025arc_atrep_20298_SAAO_IO.png	The plot shows the best-fit from SNID.	2025-02-04 10:08:25	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
20298	2025-02-04 00:08:00	Lesedi / Mookodi	600	N. Erasmus, S. Potter, C. van Gend, H. Worters, S. Chandra, D. Cunnama, M. Hlakola, P. Rabe, R. Julie (all SAAO)	N. Erasmus, D. Cunnama, S. Potter (all SAAO)	SAAO IO	tns_2025arc_2025-02-04_00-07-59.57_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

SN 2025arc

Spectra

Light curves

Comments