RA/DEC (2000)
17:53:30.565 +61:46:38.99
268.3773558 +61.7774971
Type
---
Redshift
0.2544
Discovery ReportClassification Report
Related AstroNotes: 2025-270, 2025-275
Reporting Group
GOTO
Discovering Data Source
GOTO
Discovery Date
2025-07-26 00:58:58.944
TNS AT
Y
Public
Y
Discovery Mag
20.2
Filter
L-GOTO
Reporter/s
A. Kumar, D. O'Neill, K. Ackley, M. Dyer, J. Lyman, K. Ulaczyk, D. Steeghs, D. Galloway, V. Dhillon, P. O'Brien, G. Ramsay, K. Noysena, R. Kotak, R. Breton, J. Casares, L. Nuttall, B. Godson, T. Killestein, M. Pursiainen, on behalf of GOTO collaboration
NEDSIMBADDECaLSPanSTARRS-1SkyMapperVizieRWISEDSSADS

Spectra

 ▌AT_2025seu - 2025-08-29 02:12:56 NOT / ALFOSC (GOTO)z=
▌Show H at z=vexp= km/s
▌Show He at z=vexp= km/s
▌Show He II at z=vexp= km/s
▌Show C II at z=vexp= km/s
▌Show C III at z=vexp= km/s
▌Show C IV at z=vexp= km/s
▌Show N II at z=vexp= km/s
▌Show N III at z=vexp= km/s
▌Show N IV at z=vexp= km/s
▌Show N V at z=vexp= km/s
▌Show O at z=vexp= km/s
▌Show [O I] at z=vexp= km/s
▌Show O II at z=vexp= km/s
▌Show [O II] at z=vexp= km/s
▌Show [O III] at z=vexp= km/s
▌Show O V at z=vexp= km/s
▌Show O VI at z=vexp= km/s
▌Show Na at z=vexp= km/s
▌Show Mg at z=vexp= km/s
▌Show Mg II at z=vexp= km/s
▌Show Si II at z=vexp= km/s
▌Show S II at z=vexp= km/s
▌Show Ca II at z=vexp= km/s
▌Show [Ca II] at z=vexp= km/s
▌Show Fe II at z=vexp= km/s
▌Show Fe III at z=vexp= km/s
▌Show Å at z=vexp= km/s
▌Show Å at z=vexp= km/s
▌Show Å at z=vexp= km/s
▌Show Å at z=vexp= km/s
▌Show Tellurics 
▌Show Galaxy lines at z=
▌Show WR-WN at z=vexp= km/s
▌Show WR-WC/O at z=vexp= km/s
   Binning factor: (rounded to nearest integer >1)
Mouse hovers at WL: 0 (rest),0 (observed)

Light curves

 ▌LAST_LAST-Cam_Clear
 ▌GOTO-N_GOTO-2_L
 ▌GOTO-N_GOTO-1_L
 ▌P48_ZTF-Cam_r
 ▌P48_ZTF-Cam_g
 ▌ATLAS-MLO_ATLAS-01_orange
 ▌ATLAS-HKO_ATLAS-02_orange
   
Pointer position (MJD, Mag, Abs.Mag): (0.00, 0.00, 0.00)
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
21909 2025-08-29 02:12:56 NOT / ALFOSC I. Worssam, M. Pursiainen I. Worssam, M. Pursiainen GOTO tns_2025seu_2025-08-29_02-12-56.304_NOT_ALFOSC_GOTO.dat Object
Light Curves
Filter Tel / Inst Obs-date range JD Range Photometry
Clear- LAST_LAST-Cam 2024-07-01 23:15:58 - 2025-08-31 17:20:53 2460493.46942 - 2460919.22283 2
Photometry
ID Obs-date JD Mag. / Flux Err Lim. Mag./Flux Units Filter Tel / Inst Exp-time Observer/s Remarks
514661 2025-08-31 17:20:53 2460919.22283 19.71 ABMag Clear- LAST_LAST-Cam 400
514660 2024-07-01 23:15:58 2460493.46942 21.83 ABMag Clear- LAST_LAST-Cam 7580 [Last non detection]
L-GOTO GOTO-N_GOTO-2 2025-07-26 00:58:59 - 2025-07-26 00:58:59 2460882.540961 - 2460882.540961 1
Photometry
ID Obs-date JD Mag. / Flux Err Lim. Mag./Flux Units Filter Tel / Inst Exp-time Observer/s Remarks
505084 2025-07-26 00:58:59 2460882.540961 20.2 0.19 ABMag L-GOTO GOTO-N_GOTO-2 360
L-GOTO GOTO-N_GOTO-1 2025-07-18 01:28:05 - 2025-07-18 01:28:05 2460874.561172 - 2460874.561172 1
Photometry
ID Obs-date JD Mag. / Flux Err Lim. Mag./Flux Units Filter Tel / Inst Exp-time Observer/s Remarks
505083 2025-07-18 01:28:05 2460874.561172 19.2 ABMag L-GOTO GOTO-N_GOTO-1 180 [Last non detection]
r-ZTF P48_ZTF-Cam 2025-07-19 06:14:53 - 2025-07-19 06:14:53 2460875.7603356 - 2460875.7603356 1
Photometry
ID Obs-date JD Mag. / Flux Err Lim. Mag./Flux Units Filter Tel / Inst Exp-time Observer/s Remarks
509120 2025-07-19 06:14:53 2460875.7603356 20.6116 ABMag r-ZTF P48_ZTF-Cam [Last non detection]
g-ZTF P48_ZTF-Cam 2025-07-19 06:55:43 - 2025-08-16 04:48:47 2460875.7886921 - 2460903.700544 2
Photometry
ID Obs-date JD Mag. / Flux Err Lim. Mag./Flux Units Filter Tel / Inst Exp-time Observer/s Remarks
509122 2025-08-16 04:48:47 2460903.700544 19.3964 0.104998 ABMag g-ZTF P48_ZTF-Cam
509121 2025-07-19 06:55:43 2460875.7886921 20.5955 0.115826 ABMag g-ZTF P48_ZTF-Cam
orange-ATLAS ATLAS-MLO_ATLAS-01 2025-08-10 09:20:55 - 2025-08-10 09:20:55 2460897.88953 - 2460897.88953 1
Photometry
ID Obs-date JD Mag. / Flux Err Lim. Mag./Flux Units Filter Tel / Inst Exp-time Observer/s Remarks
508242 2025-08-10 09:20:55 2460897.88953 18.69 ABMag orange-ATLAS ATLAS-MLO_ATLAS-01 30 Robot [Last non detection]
orange-ATLAS ATLAS-HKO_ATLAS-02 2025-08-12 08:25:28 - 2025-08-12 08:25:28 2460899.85102 - 2460899.85102 1
Photometry
ID Obs-date JD Mag. / Flux Err Lim. Mag./Flux Units Filter Tel / Inst Exp-time Observer/s Remarks
508243 2025-08-12 08:25:28 2460899.85102 19.149 0.115 19.52 ABMag orange-ATLAS ATLAS-HKO_ATLAS-02 110 Robot
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
268817 2025-08-31 19:47:44 LAST_Bot1 E. O. Ofek (WIS),R. Konno (WIS),E. A. Zimmerman (WIS) et al. LAST LAST 17:53:30.539 +61:46:38.78 2025-08-31 17:20:52.512 19.71 Clear- PSN LAST N
265989 2025-08-16 06:12:13 Fritz Jesper Sollerman (SU),Christoffer Fremling (Caltech),Daniel Perley (LJMU) et al. ZTF ZTF 17:53:30.565 +61:46:38.99 2025-07-19 06:55:42.997 20.5955 g-ZTF PSN ZTF25abdegyy ZTF N
265550 2025-08-12 10:45:04 ATLAS_Bot1 J. Tonry,L. Denneau,H. Weiland et al. ATLAS ATLAS 17:53:30.529 +61:46:38.99 2025-08-12 08:25:28.128 19.149 orange-ATLAS PSN ATLAS25jgm ATLAS N
263793 2025-07-26 06:51:44 GOTO_bot A. Kumar,D. O'Neill,K. Ackley et al. GOTO GOTO 17:53:30.478 +61:46:38.11 2025-07-26 00:58:58.944 20.2 L-GOTO Other GOTO25fkt GOTO 2025TNSTR2911....1K N
Classification Reports
ID Time received (UT) Sender Classifier/s Group Classification Redshift Spectra Related files Assoc. Groups End prop. period Remarks ADS Bibcode
21909 2025-08-29 14:56:59 David O'Neill I. Worssam, M. Pursiainen, J. Lyman, D. O'Neill, T. Killestein, K. Ackley, M. Dyer, K. Ulaczyk, D. Steeghs, D. Galloway, V. Dhillon, P. O'Brien, G. Ramsay, K. Noysena, R. Kotak, R. Breton, J. Casares, L. Nuttall, B. Godson, A. Kumar on behalf of GOTO collaboration GOTO Other 0.2544 1 GOTO Blue continuum with no particular notable line features. Exact classification is difficult and we leave the target as "Other". However, we note that the event is similar to the Luminous, Fast coolers found in passive galaxies (Nicholl et al. 2023) based on it's luminosity, evolution time scale, the featureless spectrum and the associating with a passive galaxy. Further observations are encouraged. Redshift from astronote #2025-270. 2025TNSCR3449....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
21909 2025-08-29 02:12:56 NOT / ALFOSC I. Worssam, M. Pursiainen I. Worssam, M. Pursiainen GOTO tns_2025seu_2025-08-29_02-12-56.304_NOT_ALFOSC_GOTO.dat Object

Comments

TNS
System

Sat, 08/16/2025 - 06:12

Object coordinates updated

Object coordinates updated according to AT-report 265989 of Group ZTF
Previous RA, DEC: 17:53:30.529, +61:46:38.99 (268.377204, +61.777496)
Updated RA, DEC: 17:53:30.565, +61:46:38.99 (268.3773558, +61.7774971)

TNS
System

Tue, 08/12/2025 - 10:45

Object coordinates updated

Object coordinates updated according to AT-report 265550 of Group ATLAS
Previous RA, DEC: 17:53:30.478, +61:46:38.11 (268.37699, +61.777253)
Updated RA, DEC: 17:53:30.529, +61:46:38.99 (268.377204, +61.777496)