2025ngs | Transient Name Server

RA/DEC (2000)

15:35:16.677 +30:51:55.75

233.819485943 +30.8654861098

Type

SN II

Redshift

0.0063

Discovery Report Classification Report

Related AstroNotes: 2025-181

Reporting Group

ATLAS

Discovering Data Source

ATLAS

Discovery Date

2025-06-12 09:34:29.280

TNS AT

Public

Discovery Mag

18.197

Filter

orange-ATLAS

Reporter/s

J. Tonry, L. Denneau, H. Weiland, R. Siverd (IfA, University of Hawaii), N. Erasmus, W. Koorts (South African Astronomical Observatory), A. Jordan, V. Suc (UAI, Obstech), 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 (QUB), P. Ramsden (Birmingham/QUB), L. Shingles (GSI/QUB), S. Srivastav, J. H. Gillanders, H. Stevance, A. J. Cooper, F. Stoppa, J. Tweddle (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

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	Spec. Type	Remarks
	21298	2025-06-13 07:47:24	Gemini-N / GMOS	2400	Sunny Stewart, Zach Hartman	Azalee Bostroem, Jennifer Andrews	DLT40	tns_2025ngs_2025-06-13_07-47-23.7_Gemini-N_GMOS_DLT40.dat	Object	A few narrow sky lines present in the FITS files have been removed from the ASCII file
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 A few narrow sky lines present in the FITS files have been removed from the ASCII file
	21294	2025-06-13 00:00:00	UH88 / SNIFS		C. Angus		SCAT	tns_2025ngs_2025-06-13_UH88_SNIFS_SCAT.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-N_GOTO-2

2025-06-08 23:37:02 - 2025-06-14 23:27:28

2460835.484047 - 2460841.477407

Photometry

ID	Obs-date	JD	Mag. / Flux	Err	Lim. Mag./Flux	Units	Filter	Tel / Inst	Exp-time	Observer/s	Remarks
496823	2025-06-14 23:27:28	2460841.477407	16.55	0.02		ABMag	L-GOTO	GOTO-N_GOTO-2	180
496822	2025-06-08 23:37:02	2460835.484047			18.7	ABMag	L-GOTO	GOTO-N_GOTO-2	180		[Last non detection]

i-P1

PS2_GPC2

2025-06-16 09:45:57 - 2025-06-16 09:45:57

2460842.90691 - 2460842.90691

Photometry

ID	Obs-date	JD	Mag. / Flux	Err	Lim. Mag./Flux	Units	Filter	Tel / Inst	Exp-time	Observer/s	Remarks
496225	2025-06-16 09:45:57	2460842.90691	15.66	0.01	20.7	ABMag	i-P1	PS2_GPC2	45	Robot

r-ZTF

P48_ZTF-Cam

2025-06-11 06:12:59 - 2025-06-13 07:09:35

2460837.7590162 - 2460839.7983218

Photometry

ID	Obs-date	JD	Mag. / Flux	Err	Lim. Mag./Flux	Units	Filter	Tel / Inst	Exp-time	Observer/s	Remarks
494760	2025-06-13 07:09:35	2460839.7983218	16.8149	0.0440769		ABMag	r-ZTF	P48_ZTF-Cam
494758	2025-06-11 06:12:59	2460837.7590162			20.1975	ABMag	r-ZTF	P48_ZTF-Cam			[Last non detection]

g-ZTF

P48_ZTF-Cam

2025-06-13 05:49:27 - 2025-06-13 05:49:27

2460839.7426736 - 2460839.7426736

Photometry

ID	Obs-date	JD	Mag. / Flux	Err	Lim. Mag./Flux	Units	Filter	Tel / Inst	Exp-time	Observer/s	Remarks
494759	2025-06-13 05:49:27	2460839.7426736	16.8909	0.0382301		ABMag	g-ZTF	P48_ZTF-Cam

orange-ATLAS

ATLAS-HKO_ATLAS-02

2025-06-11 09:38:33 - 2025-06-12 09:34:29

2460837.90177 - 2460838.89895

Photometry

ID	Obs-date	JD	Mag. / Flux	Err	Lim. Mag./Flux	Units	Filter	Tel / Inst	Exp-time	Observer/s	Remarks
494597	2025-06-12 09:34:29	2460838.89895	18.197	0.17	18.86	ABMag	orange-ATLAS	ATLAS-HKO_ATLAS-02	30	Robot
494596	2025-06-11 09:38:33	2460837.90177			17.53	ABMag	orange-ATLAS	ATLAS-HKO_ATLAS-02	30	Robot	[Last non detection]

i-P1

PS1_GPC1

2025-08-22 07:12:10 - 2025-08-22 07:12:10

2460909.80012 - 2460909.80012

Photometry

ID	Obs-date	JD	Mag. / Flux	Err	Lim. Mag./Flux	Units	Filter	Tel / Inst	Exp-time	Observer/s	Remarks
511208	2025-08-22 07:12:10	2460909.80012	17.47	0.02	20.7	ABMag	i-P1	PS1_GPC1	45	Robot

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	Remarks	ADS Bibcode	Unreal
267084	2025-08-22 13:05:52	PS1_Bot1	K. C. Chambers,T. de Boer,J. Fairlamb et al.	Pan-STARRS	Pan-STARRS	15:35:16.677	+30:51:55.75	2025-08-22 07:12:10.368	17.47	i-P1	PSN	PS25dmt	Pan-STARRS			N
259348	2025-06-20 16:59:12	GOTO_bot	D. O'Neill,K. Ackley,M. Dyer et al.	GOTO	GOTO	15:35:16.488	+30:51:55.94	2025-06-14 23:27:28.224	16.55	L-GOTO	Other	GOTO24kef	GOTO			N
259074	2025-06-18 18:05:53	PS1_Bot1	K. C. Chambers,T. de Boer,J. Fairlamb et al.	Pan-STARRS	Pan-STARRS	15:35:16.678	+30:51:55.67	2025-06-16 09:45:57.024	15.66	i-P1	PSN	PS25dmt	Pan-STARRS			N
258339	2025-06-13 07:19:50	Fritz	Nabeel Rehemtulla (CIERA,NU),Christoffer Fremling (Caltech) et al.	ZTF	ZTF	15:35:16.684	+30:51:55.72	2025-06-13 05:49:26.999	16.8909	g-ZTF	PSN	ZTF25aauvber	ZTF	Bright (m_peak <= 18.5) transient candidate identified autonomously by BTSbot (Rehemtulla et al. 2024; arXiv:2401.15167).		N
258210	2025-06-12 13:44:00	ATLAS_Bot1	J. Tonry,L. Denneau,H. Weiland et al.	ATLAS	ATLAS	15:35:16.680	+30:51:55.54	2025-06-12 09:34:29.280	18.197	orange-ATLAS	PSN	ATLAS25gbi	ATLAS		2025TNSTR2188....1T	N

Classification Reports

Time received (UT)

Sender

Classifier/s

Group

Classification

Redshift

Spectra

Related files

Assoc. Groups

End prop. period

Remarks

ADS Bibcode

21298

2025-06-13 21:34:33

K. Azalee Bostroem

K. Azalee Bostroem, S. Valenti, D. J. Sand, S. W. Jha, M. Lundquist, J. E. Andrews, E. Hoang, M. Shrestha, Y. Dong, D. Janzen, G. Hosseinzadeh, J. Pearson, N. Meza, D. Mehta, A. Ravi, A. Martas, B. Subrayan, L. Kwok, S. Stewart, Z. Hartman

DLT40

SN II

DLT40

We observed AT2025ngs with Gemini-N/GMOS with the B480 grating on 2025-06-13 07:47:23.7 as part of LLP-112 (PI Sand and Andrews). Observations were executed with a fixed PA=165 degrees to avoid as much host contamination as possible. The spectrum has narrow features with broad wings in H, He II, as well as the N/C high-ionization lines typical of flash spectroscopy which are consistent with the redshift of NGC 5961 (z=0.006)

2025TNSCR2207....1B

Related files

File	Comments	Last Modified (UT)	Modified By
tns_2025ngs_atrep_21298_DLT40.fits		2025-06-13 21:36:23	K. Azalee Bostroem

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
21298	2025-06-13 07:47:24	Gemini-N / GMOS	2400	Sunny Stewart, Zach Hartman	Azalee Bostroem, Jennifer Andrews	DLT40	tns_2025ngs_2025-06-13_07-47-23.7_Gemini-N_GMOS_DLT40.dat		Object			A few narrow sky lines present in the FITS files have been removed from the ASCII file

21294

2025-06-13 14:27:02

Charlotte Angus

C. Angus (QUB) on behalf of SCAT

SCAT

SN II

0.0063

SCAT

Spectrum taken with UH88/SNIFS on 13/06/2025. Spectrum shows blue continuum with narrow helium and hydrogen emission features, consistent with flash ionisation in core collapse supernovae. Redshift consistent with host galaxy redshift in NED.

2025TNSCR2209....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
21294	2025-06-13 00:00:00	UH88 / SNIFS		C. Angus		SCAT	tns_2025ngs_2025-06-13_UH88_SNIFS_SCAT.dat		Object

Comments

Object coordinates updated

Object coordinates updated according to AT-report 267084 of Group Pan-STARRS
Previous RA, DEC: 15:35:16.678, +30:51:55.67 (233.819491253, +30.8654630582)
Updated RA, DEC: 15:35:16.677, +30:51:55.75 (233.819485943, +30.8654861098)

Object coordinates updated

Object coordinates updated according to AT-report 259074 of Group Pan-STARRS
Previous RA, DEC: 15:35:16.684, +30:51:55.72 (233.8195175, +30.865479)
Updated RA, DEC: 15:35:16.678, +30:51:55.67 (233.819491253, +30.8654630582)

Object coordinates updated

Object coordinates updated according to AT-report 258339 of Group ZTF
Previous RA, DEC: 15:35:16.680, +30:51:55.54 (233.819501429, +30.8654285714)
Updated RA, DEC: 15:35:16.684, +30:51:55.72 (233.8195175, +30.865479)

SN 2025ngs

Spectra

Light curves

Comments

Object coordinates updated

Object coordinates updated

Object coordinates updated