2025cyh | Transient Name Server

RA/DEC (2000)

18:34:46.681 +31:50:05.25

278.6945062 +31.8347904

Type

TDE

Redshift

0.105

Discovery Report Classification Report

Reporting Group

ZTF

Discovering Data Source

ZTF

Discovery Date

2025-02-15 12:56:13.004

TNS AT

Public

Discovery Mag

19.3557

Filter

g-ZTF

Reporter/s

Daniel Perley (LJMU), Christoffer Fremling (Caltech), Theophile du Laz (Caltech) on behalf of ZTF

NED SIMBAD DECaLS PanSTARRS-1 SkyMapper VizieR WISE DSS ADS

Light curves

▌

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	Assoc. Groups	End prop. period	Remarks
	20573	2025-03-05 00:00:00	Keck1 / LRIS		R. Chornock		ZTF	tns_2025cyh_2025-03-05_00-00-00_Keck1_LRIS_ZTF.ascii		Object			The source redshift was determined to be z=0.105. The classification of this source remains ambiguous given the narrow emission line features consistent with the AGN-like line ratios but lack of strong AGN-like WISE colors and variability. We present this source as a possible TDE candidate, but it may also belong to other classes of nuclear transients, including the Bowen Fluorescence Flares (BFFs) put forth by Trakhtenbrot et al. 2019.
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 source redshift was determined to be z=0.105. The classification of this source remains ambiguous given the narrow emission line features consistent with the AGN-like line ratios but lack of strong AGN-like WISE colors and variability. We present this source as a possible TDE candidate, but it may also belong to other classes of nuclear transients, including the Bowen Fluorescence Flares (BFFs) put forth by Trakhtenbrot et al. 2019.

Light Curves

Filter

Tel / Inst

Obs-date range

JD Range

Photometry

r-ZTF

P48_ZTF-Cam

2025-02-15 12:23:29 - 2025-02-25 12:52:13

2460722.0163079 - 2460732.0362616

Photometry

ID	Obs-date	JD	Mag. / Flux	Err	Lim. Mag./Flux	Units	Filter	Tel / Inst	Exp-time	Observer/s	Remarks
472547	2025-02-25 12:52:13	2460732.0362616	19.5322	0.124686		ABMag	r-ZTF	P48_ZTF-Cam
472545	2025-02-15 12:23:29	2460722.0163079			18.6028	ABMag	r-ZTF	P48_ZTF-Cam			[Last non detection]

g-ZTF

P48_ZTF-Cam

2025-02-15 12:56:13 - 2025-02-15 12:56:13

2460722.0390394 - 2460722.0390394

Photometry

ID	Obs-date	JD	Mag. / Flux	Err	Lim. Mag./Flux	Units	Filter	Tel / Inst	Exp-time	Observer/s	Remarks
472546	2025-02-15 12:56:13	2460722.0390394	19.3557	0.278114		ABMag	g-ZTF	P48_ZTF-Cam

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	Bibcode	Unreal	Auto classification
246259	2025-02-28 11:48:07	Fritz	Daniel Perley (LJMU),Christoffer Fremling (Caltech),Theophile du Laz (Caltech) on behalf of ZTF et al.	ZTF	ZTF	18:34:46.681	+31:50:05.25	2025-02-15 12:56:13.004	19.3557	g-ZTF		PSN		ZTF25aafwfzz	ZTF			2025TNSTR.831....1P	N

Classification Reports

Time received (UT)

Sender

Classifier/s

Group

Classification

Redshift

Spectra

Related files

Assoc. Groups

End prop. period

Remarks

ADS Bibcode

20573

2025-03-14 23:37:30

Erica Hammerstein

E. Hammerstein (UC Berkeley), R. Stein (JSI), R. Chornock (UC Berkeley), Y. Yao (UC Berkeley), I. Andreoni (UNC), J. Carney (UNC) on behalf of the ZTF AGN/TDE working group

ZTF

TDE

0.105

Add

ZTF

2025TNSCR.992....1H

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
20573	2025-03-05 00:00:00	Keck1 / LRIS		R. Chornock		ZTF	tns_2025cyh_2025-03-05_00-00-00_Keck1_LRIS_ZTF.ascii		Object			The source redshift was determined to be z=0.105. The classification of this source remains ambiguous given the narrow emission line features consistent with the AGN-like line ratios but lack of strong AGN-like WISE colors and variability. We present this source as a possible TDE candidate, but it may also belong to other classes of nuclear transients, including the Bowen Fluorescence Flares (BFFs) put forth by Trakhtenbrot et al. 2019.

TDE 2025cyh

Spectra

Light curves

Comments