2025hjz | Transient Name Server

RA/DEC (2000)

10:44:07.195 -16:28:08.92

161.0299804 -16.4691434

Type

SN Ia

Redshift

0.0288

Discovery Report Classification Report

Reporting Group

GOTO

Discovering Data Source

GOTO

Discovery Date

2025-04-14 11:26:55.392

TNS AT

Y

Public

Y

Discovery Mag

17.33

Filter

L-GOTO

Reporter/s

T. Killestein, D. O'Neill, K. Ackley, M. Dyer, J. Lyman, K. Ulaczyk, D. Steeghs, D. Galloway, V. Dhillon, P. O'Brien, G. Ramsay, K. Noysena, R. Kotak, R. Breton, J. Casares, L. Nuttall, B. Godson, A. Kumar, M. Pursiainen, on behalf of GOTO collaboration

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
	20764	2025-04-14 22:18:15	LT / SPRAT	900	Robotic		GOTO	tns_2025hjz_2025-04-14_22-18-14.630_LT_SPRAT_GOTO.dat		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-3

2025-04-07 10:48:03 - 2025-04-14 11:26:55

2460772.950037 - 2460779.977032

2

Photometry

ID	Obs-date	JD	Mag. / Flux	Err	Lim. Mag./Flux	Units	Filter	Tel / Inst	Exp-time	Observer/s	Remarks
482101	2025-04-14 11:26:55	2460779.977032	17.33	0.04		ABMag	L-GOTO	GOTO-S_GOTO-3	180
482100	2025-04-07 10:48:03	2460772.950037			19.7	ABMag	L-GOTO	GOTO-S_GOTO-3	180		[Last non detection]

orange-ATLAS

ATLAS-CHL_ATLAS-04

2025-04-16 04:53:52 - 2025-04-16 04:53:52

2460781.70407 - 2460781.70407

1

Photometry

ID	Obs-date	JD	Mag. / Flux	Err	Lim. Mag./Flux	Units	Filter	Tel / Inst	Exp-time	Observer/s	Remarks
482525	2025-04-16 04:53:52	2460781.70407	17.013	0.05	18.76	ABMag	orange-ATLAS	ATLAS-CHL_ATLAS-04	30	Robot

BG-q-BlackGem

BG4_BlackGEM-Cam4

2025-04-22 00:30:58 - 2025-04-22 00:30:58

2460787.5215046 - 2460787.5215046

1

Photometry

ID	Obs-date	JD	Mag. / Flux	Err	Lim. Mag./Flux	Units	Filter	Tel / Inst	Exp-time	Observer/s	Remarks
483288	2025-04-22 00:30:58	2460787.5215046	16.64	0.02	21.29	ABMag	BG-q-BlackGem	BG4_BlackGEM-Cam4	60	robotic

BG-q-BlackGem

BG3_BlackGEM-Cam3

2025-04-01 01:24:20 - 2025-04-01 01:24:20

2460766.5585648 - 2460766.5585648

1

Photometry

ID	Obs-date	JD	Mag. / Flux	Err	Lim. Mag./Flux	Units	Filter	Tel / Inst	Exp-time	Observer/s	Remarks
483287	2025-04-01 01:24:20	2460766.5585648			21.05	ABMag	BG-q-BlackGem	BG3_BlackGEM-Cam3	60	robotic	[Last non detection]

r-ZTF

P48_ZTF-Cam

2023-12-09 10:36:17 - 2025-05-10 05:43:04

2460287.9418634 - 2460805.7382407

2

Photometry

ID	Obs-date	JD	Mag. / Flux	Err	Lim. Mag./Flux	Units	Filter	Tel / Inst	Exp-time	Observer/s	Remarks
487699	2025-05-10 05:43:04	2460805.7382407	17.2588	0.0658731		ABMag	r-ZTF	P48_ZTF-Cam
482131	2023-12-09 10:36:17	2460287.9418634	18.3003	0.164386		ABMag	r-ZTF	P48_ZTF-Cam

g-ZTF

P48_ZTF-Cam

2025-04-10 06:02:19 - 2025-04-15 05:33:18

2460775.7516088 - 2460780.7314583

2

Photometry

ID	Obs-date	JD	Mag. / Flux	Err	Lim. Mag./Flux	Units	Filter	Tel / Inst	Exp-time	Observer/s	Remarks
482132	2025-04-15 05:33:18	2460780.7314583	17.1226	0.0493597		ABMag	g-ZTF	P48_ZTF-Cam
487698	2025-04-10 06:02:19	2460775.7516088	18.8159	0.216619		ABMag	g-ZTF	P48_ZTF-Cam

orange-ATLAS

ATLAS-MLO_ATLAS-01

2025-04-13 09:58:12 - 2025-04-13 09:58:12

2460778.91542 - 2460778.91542

1

Photometry

ID	Obs-date	JD	Mag. / Flux	Err	Lim. Mag./Flux	Units	Filter	Tel / Inst	Exp-time	Observer/s	Remarks
482524	2025-04-13 09:58:12	2460778.91542			18.32	ABMag	orange-ATLAS	ATLAS-MLO_ATLAS-01	30	Robot	[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

254703

2025-05-10 07:28:31

Fritz

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

ZTF

ZTF

10:44:07.195

-16:28:08.92

2025-04-10 06:02:19.000

18.8159

g-ZTF

PSN

ZTF25aapwiux

ZTF

N

252236

2025-04-22 06:27:02

BlackGEM_Bot1

P. Groot,H. Tranin,F. Stoppa et al.

BlackGEM

BlackGEM

10:44:07.210

-16:28:08.88

2025-04-22 00:30:58.000

16.64

BG-q-BlackGem

1

PSN

BGEM J104407.21-162808.8

BlackGEM

N

Related files

File	Comments	Last Modified (UT)	Modified By
tns_2025hjz_atrep_252236_BlackGEM.pdf	Finding Chart	2025-04-22 06:27:05	BlackGEM_Bot1

251828

2025-04-18 09:52:57

ATLAS_Bot1

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

ATLAS

ATLAS

10:44:07.207

-16:28:09.26

2025-04-16 04:53:51.648

17.013

orange-ATLAS

PSN

ATLAS25dxr

ATLAS

N

251647

2025-04-15 05:43:02

Fritz

Nabeel Rehemtulla (CIERA,NU),Christoffer Fremling (Caltech) et al.

ZTF

ZTF

10:44:07.204

-16:28:08.99

2023-12-09 10:36:16.997

18.3003

r-ZTF

PSN

ZTF23absjbyu

ZTF

Bright (m_peak <= 18.5) transient candidate identified autonomously by BTSbot (Rehemtulla et al. 2024; arXiv:2401.15167).

N

251631

2025-04-14 12:10:57

GOTO_bot

T. Killestein,D. O'Neill,K. Ackley et al.

GOTO

GOTO

10:44:07.198

-16:28:09.23

2025-04-14 11:26:55.392

17.33

L-GOTO

Other

GOTO25buy

GOTO

2025TNSTR1381....1K

N

Classification Reports

ID

Time received (UT)

Sender

Classifier/s

Group

Classification

Redshift

Spectra

Related files

Assoc. Groups

End prop. period

Remarks

ADS Bibcode

20764

2025-04-15 07:58:53

Miika Pursiainen

M. Pursiainen, T. Killestein, D. O'Neill, B. Warwick, K. Ackley, M. Dyer, F. Jiménez-Ibarra, J. Lyman, K. Ulaczyk, D. Steeghs, D. Galloway, V. Dhillon, P. O'Brien, G. Ramsay, K. Noysena, R. Kotak, R. Breton, L. Nuttall, E. Pallé, D. Pollacco, T. Killestein, A. Kumar on behalf of GOTO collaboration

GOTO

SN Ia

0.0288

1

GOTO

Spectrum consistent with a young Type Ia SN approximately a week before peak brightness. The redshift is that of the known host.

2025TNSCR1395....1P

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
20764	2025-04-14 22:18:15	LT / SPRAT	900	Robotic		GOTO	tns_2025hjz_2025-04-14_22-18-14.630_LT_SPRAT_GOTO.dat		Object

Comments

Object coordinates updated

Object coordinates updated according to AT-report 254703 of Group ZTF
Previous RA, DEC: 10:44:07.204, -16:28:08.99 (161.0300185, -16.4691629)
Updated RA, DEC: 10:44:07.195, -16:28:08.92 (161.0299804, -16.4691434)

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Object coordinates updated

Object coordinates updated according to AT-report 251647 of Group ZTF
Previous RA, DEC: 10:44:07.198, -16:28:09.23 (161.02999, -16.46923)
Updated RA, DEC: 10:44:07.204, -16:28:08.99 (161.0300185, -16.4691629)

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