2025ass | Transient Name Server

RA/DEC (2000)

10:45:01.813 +76:41:12.13

161.2575525 +76.6867034

Type

SN Ia

Redshift

0.03

Discovery Report Classification Report

Reporting Group

GOTO

Discovering Data Source

GOTO

Discovery Date

2025-01-29 01:46:27.552

TNS AT

Public

Discovery Mag

19.86

Filter

L-GOTO

Reporter/s

D. O'Neill, 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

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
	20313	2025-02-05 01:04:35	LT / SPRAT		Robotic		GOTO	tns_2025ass_2025-02-05_01-04-35.38_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
	20301	2025-02-03 00:00:00	HCT-2m / HFOSC	2700	Hrishav Das	Hrishav Das	None	tns_2025ass_2025-02-03_HCT-2m_HFOSC_None.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

2025-01-27 00:48:12 - 2025-01-27 00:48:12

2460702.533474 - 2460702.533474

Photometry

ID	Obs-date	JD	Mag. / Flux	Err	Lim. Mag./Flux	Units	Filter	Tel / Inst	Exp-time	Observer/s	Remarks
466478	2025-01-27 00:48:12	2460702.533474			19.6	ABMag	L-GOTO	GOTO-N_GOTO-2	180		[Last non detection]

L-GOTO

GOTO-N_GOTO-1

2025-01-29 01:46:28 - 2025-01-29 01:46:28

2460704.573929 - 2460704.573929

Photometry

ID	Obs-date	JD	Mag. / Flux	Err	Lim. Mag./Flux	Units	Filter	Tel / Inst	Exp-time	Observer/s	Remarks
466479	2025-01-29 01:46:28	2460704.573929	19.86	0.18		ABMag	L-GOTO	GOTO-N_GOTO-1	180

r-ZTF

P48_ZTF-Cam

2025-02-03 04:22:18 - 2025-02-04 05:46:49

2460709.6821528 - 2460710.7408449

Photometry

ID	Obs-date	JD	Mag. / Flux	Err	Lim. Mag./Flux	Units	Filter	Tel / Inst	Exp-time	Observer/s	Remarks
466789	2025-02-04 05:46:49	2460710.7408449	17.7752	0.107718		ABMag	r-ZTF	P48_ZTF-Cam
466788	2025-02-03 04:22:18	2460709.6821528	17.9002	0.0458891		ABMag	r-ZTF	P48_ZTF-Cam

g-ZTF

P48_ZTF-Cam

2025-02-01 03:59:32 - 2025-02-01 03:59:32

2460707.6663426 - 2460707.6663426

Photometry

ID	Obs-date	JD	Mag. / Flux	Err	Lim. Mag./Flux	Units	Filter	Tel / Inst	Exp-time	Observer/s	Remarks
466787	2025-02-01 03:59:32	2460707.6663426			18.0433	ABMag	g-ZTF	P48_ZTF-Cam			[Last non detection]

orange-ATLAS

ATLAS-MLO_ATLAS-01

2025-02-03 11:34:19 - 2025-02-03 11:34:19

2460709.98216 - 2460709.98216

Photometry

ID	Obs-date	JD	Mag. / Flux	Err	Lim. Mag./Flux	Units	Filter	Tel / Inst	Exp-time	Observer/s	Remarks
466582	2025-02-03 11:34:19	2460709.98216	17.945	0.073	19.16	ABMag	orange-ATLAS	ATLAS-MLO_ATLAS-01	30	Robot

cyan-ATLAS

ATLAS-HKO_ATLAS-02

2025-01-24 12:54:37 - 2025-01-24 12:54:37

2460700.03793 - 2460700.03793

Photometry

ID	Obs-date	JD	Mag. / Flux	Err	Lim. Mag./Flux	Units	Filter	Tel / Inst	Exp-time	Observer/s	Remarks
466581	2025-01-24 12:54:37	2460700.03793			19.22	ABMag	cyan-ATLAS	ATLAS-HKO_ATLAS-02	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	AT Type	Internal name	Assoc. Groups	Remarks	ADS Bibcode	Unreal
243410	2025-02-04 05:59:08	Fritz	Sam Rose (Caltech),Nabeel Rehemtulla (CIERA,NU) et al.	ZTF	ZTF	10:45:01.813	+76:41:12.13	2025-02-03 04:22:18.001	17.9002	r-ZTF	PSN	ZTF25aadlcbi	ZTF	Bright (m_peak <= 18.5) transient candidate identified autonomously by BTSbot (Rehemtulla et al. 2024; arXiv:2401.15167).		N
243357	2025-02-03 16:39:53	ATLAS_Bot1	J. Tonry,L. Denneau,H. Weiland et al.	ATLAS	ATLAS	10:45:01.846	+76:41:12.22	2025-02-03 11:34:18.624	17.945	orange-ATLAS	PSN	ATLAS25bhm	ATLAS			N
243306	2025-02-03 09:50:26	GOTO_bot	D. O'Neill,K. Ackley,M. Dyer et al.	GOTO	GOTO	10:45:01.852	+76:41:12.14	2025-01-29 01:46:27.552	19.86	L-GOTO	Other	GOTO25zz	GOTO	This transient was discovered with the assistance of the GOTO Kilonova Seekers Citizen Scientists on Zooniverse. The candidate was flagged by volunteers: Mayahuel Torres Guerrero, Hiroki Fukuyama, Ciro Sirio Perrella, Henryk Krawczyk, M.T. Mazzucato	2025TNSTR.460....1O	N

Classification Reports

Time received (UT)

Sender

Classifier/s

Group

Classification

Redshift

Spectra

Related files

Assoc. Groups

End prop. period

Remarks

ADS Bibcode

20313

2025-02-05 11:03:14

Miika Pursiainen

M. Pursiainen, J. Lyman, B. Warwick, K. Ackley, M. Dyer, F. Jiménez-Ibarra, 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, D. O'Neill on behalf of GOTO collaboration

GOTO

SN Ia

0.03

GOTO

Agree with the previous report. Type Ia SN at z~0.03 (SNID), inconsistent with the apparent host galaxy UGC 05841 (z = 0.006298)

2025TNSCR.504....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
20313	2025-02-05 01:04:35	LT / SPRAT		Robotic		GOTO	tns_2025ass_2025-02-05_01-04-35.38_LT_SPRAT_GOTO.dat		Object

20301

2025-02-04 12:10:09

Hrishav Das

Hrishav Das (IIA), D.K. Sahu (IIA), Rishabh Teja (IIA)

None

SN Ia

0.03

We classify the supernova SN 2025ass based on a spectrum from HFOSC (HCT) observed on 2025-02-03. We get best matches with a pre-maximum Type Ia with a redshift ~ 0.03 using Supernova Identification tool (SNID). The redshift esimate seems to be inconsistent with the redshift of the the nearby host UGC 05841 (z = 0.006298).

2025TNSCR.481....1D

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
20301	2025-02-03 00:00:00	HCT-2m / HFOSC	2700	Hrishav Das	Hrishav Das	None	tns_2025ass_2025-02-03_HCT-2m_HFOSC_None.dat		Object

Comments

Object coordinates updated

Object coordinates updated according to AT-report 243410 of Group ZTF
Previous RA, DEC: 10:45:01.846, +76:41:12.22 (161.257693333, +76.6867277778)
Updated RA, DEC: 10:45:01.813, +76:41:12.13 (161.2575525, 76.6867034)

Object coordinates updated

Object coordinates updated according to AT-report 243357 of Group ATLAS
Previous RA, DEC: 10:45:01.852, +76:41:12.14 (161.257716, +76.686706)
Updated RA, DEC: 10:45:01.846, +76:41:12.22 (161.257693333, 76.6867277778)