2026gzx | Transient Name Server

RA/DEC (2000)

11:53:56.927 -23:09:45.52

178.4871947 -23.1626457

Type

SN Ic

Redshift

0.00509

Discovery Report Classification Report

Related AstroNotes: 2026-82

Reporting Group

ATLAS

Discovering Data Source

ATLAS

Discovery Date

2026-03-23 05:28:05.376

TNS AT

Public

Discovery Mag

16.797

Filter

cyan-ATLAS

Reporter/s

J. Tonry, L. Denneau, H. Weiland (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, P. J. Broda, A. J. Smith (QUB), P. Ramsden (Birmingham/QUB), L. Shingles (GSI/QUB), S. Srivastav, J. H. Gillanders, H. Stevance, A. J. Cooper, F. Stoppa, J. Tweddle, L. Eastman (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

▌

GOTO-S_GOTO-4_L

▌

ATLAS-CHL_ATLAS-04_cyan

▌

P48_ZTF-Cam_r

▌

P48_ZTF-Cam_g

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
	23414	2026-03-30 12:00:00	ANU-2.3m / WiFeS	1200	Robotic	B. Martin	Supernova Alliance	tns_2026gzx_2026-03-30.5_ANU-2.3m_WiFeS_Supernova_Alliance.dat	tns_2026gzx_2026-03-30.5_ANU-2.3m_WiFeS_Supernova_Alliance.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
	23343	2026-03-24 17:53:06	Lijiang-2.4m / YFOSC		Jujia Zhang		LiONS	tns_2026gzx_2026-03-24_17-53-05.596_Lijiang-2.4m_YFOSC_LiONS.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
	23334	2026-03-23 15:07:03	FTS / FLOYDS-S	1800	LCO	Banzai-Floyds	Global SN Project	tns_2026gzx_2026-03-23_15-07-03_FTS_FLOYDS-S_Global_SN_Project.ascii		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

2026-03-15 14:12:59 - 2026-03-28 11:38:13

2461115.092351 - 2461127.984873

Photometry

ID	Obs-date	JD	Mag. / Flux	Err	Lim. Mag./Flux	Units	Filter	Tel / Inst	Exp-time	Observer/s	Remarks
572860	2026-03-28 11:38:13	2461127.984873	15.48	0.01		ABMag	L-GOTO	GOTO-S_GOTO-4	180
572859	2026-03-15 14:12:59	2461115.092351			19.8	ABMag	L-GOTO	GOTO-S_GOTO-4	90		[Last non detection]

cyan-ATLAS

ATLAS-CHL_ATLAS-04

2026-03-17 06:59:37 - 2026-03-23 05:28:05

2461116.7914 - 2461122.72784

Photometry

ID	Obs-date	JD	Mag. / Flux	Err	Lim. Mag./Flux	Units	Filter	Tel / Inst	Exp-time	Observer/s	Remarks
569432	2026-03-23 05:28:05	2461122.72784	16.797	0.037	19.58	ABMag	cyan-ATLAS	ATLAS-CHL_ATLAS-04	30	Robot
569431	2026-03-17 06:59:37	2461116.7914			19.27	ABMag	cyan-ATLAS	ATLAS-CHL_ATLAS-04	30	Robot	[Last non detection]

r-ZTF

P48_ZTF-Cam

2026-03-21 07:32:48 - 2026-03-21 07:32:48

2461120.8144444 - 2461120.8144444

Photometry

ID	Obs-date	JD	Mag. / Flux	Err	Lim. Mag./Flux	Units	Filter	Tel / Inst	Exp-time	Observer/s	Remarks
571911	2026-03-21 07:32:48	2461120.8144444	18.2997	0.0411016		ABMag	r-ZTF	P48_ZTF-Cam

g-ZTF

P48_ZTF-Cam

2026-03-19 08:02:43 - 2026-03-21 09:25:23

2461118.8352199 - 2461120.8926273

Photometry

ID	Obs-date	JD	Mag. / Flux	Err	Lim. Mag./Flux	Units	Filter	Tel / Inst	Exp-time	Observer/s	Remarks
571912	2026-03-21 09:25:23	2461120.8926273	18.2006	0.0369868		ABMag	g-ZTF	P48_ZTF-Cam
571910	2026-03-19 08:02:43	2461118.8352199			20.1702	ABMag	g-ZTF	P48_ZTF-Cam			[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	AT Type	Internal name	Assoc. Groups	ADS Bibcode	Unreal
298885	2026-04-06 14:35:56	GOTO_bot	D. O'Neill, K. Ackley, M. Dyer et al.	GOTO	GOTO	11:53:56.924	-23:09:45.60	2026-03-28 11:38:12.768	15.48	L-GOTO	Other	GOTO26cuv	GOTO		N
298313	2026-04-02 16:32:48	Fritz	Jesper Sollerman (SU), Christoffer Fremling (Caltech), Daniel Perley (LJMU) et al.	ZTF	ZTF	11:53:56.927	-23:09:45.52	2026-03-21 07:32:47.996	18.2997	r-ZTF	PSN	ZTF26aaqkujg	ZTF		N
297057	2026-03-23 10:39:56	ATLAS_Bot1	J. Tonry, L. Denneau, H. Weiland (IfA, University of Hawaii) et al.	ATLAS	ATLAS	11:53:56.927	-23:09:45.53	2026-03-23 05:28:05.376	16.797	cyan-ATLAS	PSN	ATLAS26dex	ATLAS	2026TNSTR1244....1T	N

Classification Reports

Time received (UT)

Sender

Classifier/s

Group

Classification

Redshift

Spectra

Related files

Assoc. Groups

End prop. period

Remarks

ADS Bibcode

23412

2026-04-01 02:30:34

Bailey Martin

B. Martin (ANU), B. P. Schmidt (ANU), K. Auchettl (University of Melbourne/UCSC), P. Armstrong (ANU), D. Cao (ANU), C. Lidman (ANU), L. Rauf (ANU), J. Shi (University of Melbourne), and B. E. Tucker (ANU)

Supernova Alliance

SN Ic

0.00509

Supernova Alliance

Classified with both superfit and SNID. Type Ic fits are more significant than Type Ia. SN 1994I is the best fitting spectrum in superfit.

2026TNSCR1395....1M

Related files

File	Comments	Last Modified (UT)	Modified By
tns_2026gzx_atrep_23412_Supernova_Alliance.pdf	The best fitting spectrum from superfit.	2026-04-01 02:30:34	Bailey Martin

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
23414	2026-03-30 12:00:00	ANU-2.3m / WiFeS	1200	Robotic	B. Martin	Supernova Alliance	tns_2026gzx_2026-03-30.5_ANU-2.3m_WiFeS_Supernova_Alliance.dat	tns_2026gzx_2026-03-30.5_ANU-2.3m_WiFeS_Supernova_Alliance.fits	Object

23341

2026-03-25 08:18:58

Liping Li

Zeyi Wang, Liping Li, Qian Zhai, Bo Wang, Jujia Zhang (YNAO); Xiaofeng Wang(THU)

LiONS

SN Ia

0.004955

LiONS, YNTS

The spectrum obtained by LJT is similar to that of an SN Ia.

2026TNSCR1289....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
23343	2026-03-24 17:53:06	Lijiang-2.4m / YFOSC		Jujia Zhang		LiONS	tns_2026gzx_2026-03-24_17-53-05.596_Lijiang-2.4m_YFOSC_LiONS.dat		Object

23332

2026-03-24 04:45:23

Moira Andrews

Moira Andrews(UCSB/LCO), Brian Hsu (UofA), Joseph Farah, Kathryn Wynn, D. Andrew Howell, Curtis McCully

Global SN Project

SN Ia

0.004955

Global SN Project

We report the classification of AT 2026gzx as a SN Ia 99aa-like using SNID (Blondin & Tonry 2007, ApJ, 666, 1024) and SNID-SAGE (Stoppa, F., (in prep)). The supernova is visually located in NGC 3955 (z = 0.004973, d = 20.600 Mpc, value from NED). SNID-SAGE reports a redshift from the spectrum of z = 0.004955 +/- 0.002, consistent with the host galaxy redshift from NED. The best match for this spectrum was SN 1999aa, 10 days before maximum brightness. Additional follow-up is encouraged.

2026TNSCR1269....1A

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
23334	2026-03-23 15:07:03	FTS / FLOYDS-S	1800	LCO	Banzai-Floyds	Global SN Project	tns_2026gzx_2026-03-23_15-07-03_FTS_FLOYDS-S_Global_SN_Project.ascii		Object

Comments

Object coordinates updated

Object coordinates updated according to AT-report 298313 of Group ZTF
Previous RA, DEC: 11:53:56.927, -23:09:45.53 (178.487196667, -23.1626466667)
Updated RA, DEC: 11:53:56.927, -23:09:45.52 (178.4871947, -23.1626457)

SN 2026gzx

Spectra

Light curves

Comments

Object coordinates updated