2026fsf | Transient Name Server

RA/DEC (2000)

11:54:58.006 +69:19:28.68

178.741692286 +69.3246344286

Type

SN II

Redshift

0.0224

Discovery Report Classification Report

Reporting Group

XOSS

Discovering Data Source

XOSS

Discovery Date

2026-03-15 20:51:02.592

TNS AT

Y

Public

Y

Host Name

NGC 3961

Host Redshift

0.022422

Discovery Mag

17.46

Filter

Clear-

Reporter/s

Yaozhang Ou, Jiashuo Zhang, Ezhar Elijan, Mi Zhang, Jianlin Xu, Hualin Li, Ziyang Mai, Leiming Tang, Yanxi Li, Wenjie Zhou, Jingyuan Zhao, Guoyou Sun, Jiangao Ruan, Xing Gao, on behalf of the PSP team

NED SIMBAD DECaLS PanSTARRS-1 SkyMapper VizieR WISE DSS ADS

Light curves

▌

ATLAS-TDO_ATLAS-05_wide

▌

LAST_LAST-Cam_Clear

▌

ATLAS-HKO_ATLAS-02_orange

▌

Other_Other_Clear

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
	23298	2026-03-19 00:33:00	Ekar / AFOSC	1800	A. Reguitti	A. Reguitti	Padova-Asiago	tns_2026fsf_2026-03-19_00-33-00_Ekar_AFOSC_Padova-Asiago.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

wide-ATLAS

ATLAS-TDO_ATLAS-05

2026-03-15 01:38:18 - 2026-03-15 01:38:18

2461114.56826 - 2461114.56826

1

Photometry

ID	Obs-date	JD	Mag. / Flux	Err	Lim. Mag./Flux	Units	Filter	Tel / Inst	Exp-time	Observer/s	Remarks
572664	2026-03-15 01:38:18	2461114.56826			19.47	ABMag	wide-ATLAS	ATLAS-TDO_ATLAS-05	30	Robot	[Last non detection]

Clear-

LAST_LAST-Cam

2024-03-04 23:12:55 - 2026-04-21 17:25:57

2460374.4673 - 2461152.22635

2

Photometry

ID	Obs-date	JD	Mag. / Flux	Err	Lim. Mag./Flux	Units	Filter	Tel / Inst	Exp-time	Observer/s	Remarks
576791	2026-04-21 17:25:57	2461152.22635	18.07			ABMag	Clear-	LAST_LAST-Cam	400
576790	2024-03-04 23:12:55	2460374.4673			21.41	ABMag	Clear-	LAST_LAST-Cam	3200		[Last non detection]

orange-ATLAS

ATLAS-HKO_ATLAS-02

2026-03-25 09:37:37 - 2026-03-25 09:37:37

2461124.90112 - 2461124.90112

1

Photometry

ID	Obs-date	JD	Mag. / Flux	Err	Lim. Mag./Flux	Units	Filter	Tel / Inst	Exp-time	Observer/s	Remarks
572665	2026-03-25 09:37:37	2461124.90112	17.342	0.042	19.16	ABMag	orange-ATLAS	ATLAS-HKO_ATLAS-02	30	Robot

Clear-

Other_Other

2026-03-15 20:51:03 - 2026-03-16 11:02:23

2461115.36878 - 2461115.9599907

2

Photometry

ID	Obs-date	JD	Mag. / Flux	Err	Lim. Mag./Flux	Units	Filter	Tel / Inst	Exp-time	Observer/s	Remarks
565283	2026-03-16 11:02:23	2461115.9599907	17.22	0.06		ABMag	Clear-	Other_Other	300
565129	2026-03-15 20:51:03	2461115.36878	17.46		19.5	VegaMag	Clear-	Other_Other	60	Xing Gao

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
300898	2026-04-21 18:06:14	LAST_Bot1	R. Konno (WIS), E. A. Zimmerman (WIS), A. Horowicz (WIS) et al.	LAST	LAST	11:54:57.982	+69:19:28.56	2026-04-21 17:25:56.640	18.07	Clear-		PSN			LAST				N
298760	2026-04-05 21:45:47	ATLAS_Bot1	J. Tonry, L. Denneau, H. Weiland (IfA, University of Hawaii) et al.	ATLAS	ATLAS	11:54:58.006	+69:19:28.68	2026-03-25 09:37:36.768	17.342	orange-ATLAS		PSN		ATLAS26dtu	ATLAS				N
294735	2026-03-16 16:40:09	jiashuo Zhang	Jiashuo Zhang	STSP	STSP	11:54:58.080	+69:19:29.40	2026-03-16 11:02:23.200	17.22	Clear-		PSN			STSP		We obtained follow-up photometric observations of AT 2026fsf. The observation was carried out on 2026 March 16.45999 UT (JD 2461115.95999), with MPC station code U94. The equipment used was a 0.5-m Planewave DeltaRho 500 f/3 telescope with a ZWO ASI6200M Pro camera. In a 300 s exposure, the source was measured to have a magnitude of 17.22 ± 0.06. Compared with the discovery report on TNS, which gave a magnitude of 17.46, the source has brightened by about 0.24 mag. Further spectroscopic observations are recommended to confirm its specific type.		N
294668	2026-03-16 10:17:03	XOSS_Bot0	Yaozhang Ou, Jiashuo Zhang, Ezhar Elijan et al.	XOSS	XOSS	11:54:58.080	+69:19:29.40	2026-03-15 20:51:02.592	17.46	Clear-		PSN	NGC 3961	PSP26I	XOSS		SN candidate classified by XOSS. Details can be found at http://xjltp.china-vo.org/psp26i.html	2026TNSTR1117....1O	N

Classification Reports

ID

Time received (UT)

Sender

Classifier/s

Group

Classification

Redshift

Spectra

Related files

Assoc. Groups

End prop. period

Remarks

ADS Bibcode

23297

2026-03-19 01:20:36

Andrea Reguitti

Andrea Reguitti (INAF-OAPd), Claudio Balcon (ISSP), Elena Muolo (Università La Sapienza di Roma), Tommaso Schiesaro, Tommaso Del Santo, Giacomo Figini, Alice Flamini

Padova-Asiago

SN II

0.0224

1

Padova-Asiago

Blue continuum with a hint of a broad (FWHM~15,000 km/s) Halpha line, consistent with a young CC SN. The narrow Halpha line is consistent with the redshift of the host galaxy.

2026TNSCR1189....1R

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
23298	2026-03-19 00:33:00	Ekar / AFOSC	1800	A. Reguitti	A. Reguitti	Padova-Asiago	tns_2026fsf_2026-03-19_00-33-00_Ekar_AFOSC_Padova-Asiago.dat		Object

Comments

Object coordinates updated

Object coordinates updated according to AT-report 298760 of Group ATLAS
Previous RA, DEC: 11:54:58.080, +69:19:29.40 (178.742, +69.324833)
Updated RA, DEC: 11:54:58.006, +69:19:28.68 (178.741692286, +69.3246344286)

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