RA/DEC (2000)
23:52:17.902 +07:34:00.73
358.0745907 +7.5668694
Type
TDE
Redshift
0.0772
Discovery ReportClassification Report
Reporting Group
ZTF
Discovering Data Source
ZTF
Discovery Date
2025-10-12 06:02:55.003
TNS AT
Y
Public
Y
Discovery Mag
20.0897
Filter
g-ZTF
Reporter/s
Jesper Sollerman (SU), Christoffer Fremling (Caltech), Daniel Perley (LJMU), Theophile du Laz (Caltech) on behalf of ZTF
NEDSIMBADDECaLSPanSTARRS-1SkyMapperVizieRWISEDSSADS

Spectra

 ▌TDE_2025abqg - 2025-10-30 23:45:37 NOT / ALFOSC (None)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
z-step:   v-step: 
   Binning factor: (rounded to nearest integer >1)
Mouse hovers at WL: 0 (rest),0 (observed)

Light curves

 ▌ATLAS-TDO_ATLAS-05_wide
 ▌ATLAS-CHL_ATLAS-04_orange
 ▌P48_ZTF-Cam_r
 ▌P48_ZTF-Cam_g
   
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
22334 2025-10-30 23:45:37 NOT / ALFOSC 1800 Arthur Kadela Panos Charalampopoulos None tns_2025abqg_2025-10-30_23-45-37.418_NOT_ALFOSC_None.ascii Object
Light Curves
Filter Tel / Inst Obs-date range JD Range Photometry
wide-ATLAS ATLAS-TDO_ATLAS-05 2025-11-09 20:56:22 - 2025-11-09 20:56:22 2460989.37248 - 2460989.37248 1
Photometry
ID Obs-date JD Mag. / Flux Err Lim. Mag./Flux Units Filter Tel / Inst Exp-time Observer/s Remarks
529892 2025-11-09 20:56:22 2460989.37248 18.719 0.069 20.2 ABMag wide-ATLAS ATLAS-TDO_ATLAS-05 30 Robot
orange-ATLAS ATLAS-CHL_ATLAS-04 2025-11-08 02:36:36 - 2025-11-08 02:36:36 2460987.60875 - 2460987.60875 1
Photometry
ID Obs-date JD Mag. / Flux Err Lim. Mag./Flux Units Filter Tel / Inst Exp-time Observer/s Remarks
529891 2025-11-08 02:36:36 2460987.60875 18.75 ABMag orange-ATLAS ATLAS-CHL_ATLAS-04 30 Robot [Last non detection]
r-ZTF P48_ZTF-Cam 2025-10-09 08:56:44 - 2025-10-26 06:04:07 2460957.8727315 - 2460974.7528588 2
Photometry
ID Obs-date JD Mag. / Flux Err Lim. Mag./Flux Units Filter Tel / Inst Exp-time Observer/s Remarks
527006 2025-10-26 06:04:07 2460974.7528588 19.9107 0.200773 ABMag r-ZTF P48_ZTF-Cam
527004 2025-10-09 08:56:44 2460957.8727315 19.4582 ABMag r-ZTF P48_ZTF-Cam [Last non detection]
g-ZTF P48_ZTF-Cam 2025-10-12 06:02:55 - 2025-10-12 06:02:55 2460960.7520255 - 2460960.7520255 1
Photometry
ID Obs-date JD Mag. / Flux Err Lim. Mag./Flux Units Filter Tel / Inst Exp-time Observer/s Remarks
527005 2025-10-12 06:02:55 2460960.7520255 20.0897 0.188617 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 ADS Bibcode Unreal Auto classification
276150 2025-11-09 23:06:25 ATLAS_Bot1 J. Tonry, L. Denneau, H. Weiland et al. ATLAS ATLAS 23:52:17.922 +07:34:00.97 2025-11-09 20:56:22.272 18.719 wide-ATLAS PSN ATLAS25nzo ATLAS N
274850 2025-10-26 07:58:27 Fritz Jesper Sollerman (SU), Christoffer Fremling (Caltech), Daniel Perley (LJMU) et al. ZTF ZTF 23:52:17.902 +07:34:00.73 2025-10-12 06:02:55.003 20.0897 g-ZTF PSN ZTF25abwvuln ZTF 2025TNSTR4305....1S N
Classification Reports
ID Time received (UT) Sender Classifier/s Group Classification Redshift Spectra Related files Assoc. Groups End prop. period Remarks ADS Bibcode
22334 2025-10-31 13:46:59 Panos Charalampopoulos Panos Charalampopoulos None TDE 0.0772 1 1 We report the tentative classification of AT2025abqg as a potential Tidal Disruption Event (TDE) based on an optical spectrum obtained with the Nordic Optical Telescope on 2025-10-30 (i.e., MJD 60978.99). At a redshift of 0.0772, we robustly identify a plethora of galaxy lines including CaII H&K and NaI D, as well as narrow emission lines of [OIII], [NII] and Halpha. We detect broad Halpha, and a blend of potentially broad Hbeta and HeII 4686. Comparison with a library of transient spectra using NGSF (AstroNote 2022-191, Howell et al. 2005 2005ApJ...634.1190H) and after masking the galaxy lines, does not return a robust match with a single transient class (including TDEs and SNe II). However, the best match seems to be with a TDE (see attached image). Based on the broad lines, the latest g-r ZTF colour (-0.36 in the last epoch corrected for MW extinction) and the seemingly constant colour evolution, we tentatively classify the transient as a TDE. At that redshift, and correcting for the MW extinction, the curreqnt absolute g-band magnitude is Mg ~ -18.9. 2025TNSCR4388....1C
Related files
File Comments Last Modified (UT) Modified By
tns_2025abqg_atrep_22334.png Classifications were done using NGSF (Next Generation SuperFit; AstroNote 2022-191, Howell et al. 2005 2005ApJ...634.1190H). 2025-10-31 13:46:59 Panos Charalampopoulos
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
22334 2025-10-30 23:45:37 NOT / ALFOSC 1800 Arthur Kadela Panos Charalampopoulos None tns_2025abqg_2025-10-30_23-45-37.418_NOT_ALFOSC_None.ascii Object

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