RA/DEC (2000)
12:54:17.622 -08:36:07.47
193.5734242 -8.6020753
Type
AGN
Redshift
0.336
Discovery ReportClassification Report
Related AstroNotes: 2026-111
Reporting Group
ZTF
Discovering Data Source
ZTF
Discovery Date
2025-12-08 12:05:45.997
TNS AT
Y
Public
Y
Discovery Mag
19.9128
Filter
r-ZTF
Reporter/s
Daniel Perley (LJMU), Christoffer Fremling (Caltech), Theophile du Laz (Caltech) on behalf of ZTF
NEDSIMBADDECaLSPanSTARRS-1SkyMapperVizieRWISEDSSADS

Spectra

 ▌AT_2025ahbd - 2026-04-20 00:00:00 Keck1 / LRIS (TRex)z=
 ▌AT_2025ahbd - 2026-02-16 10:29:32 HET / HET-LRS (FLEET)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

 ▌GOTO-N_GOTO-2_L
 ▌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
23547 2026-04-20 00:00:00 Keck1 / LRIS E. Hammerstein, R. Chornock TRex tns_2025ahbd_2026-04-20_Keck1_LRIS_TRex.flm Object
23047 2026-02-16 10:29:32 HET / HET-LRS 2807 HET Megan Newsome FLEET tns_2025ahbd_2026-02-16_10-29-31.724594_HET_HET-LRS_FLEET.dat Object
Light Curves
Filter Tel / Inst Obs-date range JD Range Photometry
L-GOTO GOTO-N_GOTO-2 2025-11-30 06:28:55 - 2025-12-18 06:11:57 2461009.770081 - 2461027.758301 2
Photometry
ID Obs-date JD Mag. / Flux Err Lim. Mag./Flux Units Filter Tel / Inst Exp-time Observer/s Remarks
553980 2025-12-18 06:11:57 2461027.758301 19.56 0.19 ABMag L-GOTO GOTO-N_GOTO-2 180
553979 2025-11-30 06:28:55 2461009.770081 19.7 ABMag L-GOTO GOTO-N_GOTO-2 180 [Last non detection]
r-ZTF P48_ZTF-Cam 2025-12-08 12:05:46 - 2025-12-15 13:23:33 2461018.0040046 - 2461025.0580208 2
Photometry
ID Obs-date JD Mag. / Flux Err Lim. Mag./Flux Units Filter Tel / Inst Exp-time Observer/s Remarks
539226 2025-12-15 13:23:33 2461025.0580208 19.7547 0.172069 ABMag r-ZTF P48_ZTF-Cam
539225 2025-12-08 12:05:46 2461018.0040046 19.9128 0.177554 ABMag r-ZTF P48_ZTF-Cam
g-ZTF P48_ZTF-Cam 2025-12-07 12:57:45 - 2025-12-07 12:57:45 2461017.0401042 - 2461017.0401042 1
Photometry
ID Obs-date JD Mag. / Flux Err Lim. Mag./Flux Units Filter Tel / Inst Exp-time Observer/s Remarks
539224 2025-12-07 12:57:45 2461017.0401042 19.1617 ABMag g-ZTF P48_ZTF-Cam [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 Related files AT Type Host name Internal name Assoc. Groups End prop. period Remarks ADS Bibcode Unreal Auto classification
289004 2026-01-26 09:16:50 GOTO_bot D. O'Neill, K. Ackley, M. Dyer et al. GOTO GOTO 12:54:17.602 -08:36:08.14 2025-12-18 06:11:57.120 19.56 L-GOTO Other GOTO26adk GOTO N
280769 2025-12-15 16:11:19 Fritz Daniel Perley (LJMU), Christoffer Fremling (Caltech), Theophile du Laz (Caltech) on behalf of ZTF ZTF ZTF 12:54:17.622 -08:36:07.47 2025-12-08 12:05:45.997 19.9128 r-ZTF PSN ZTF25acgtfmh ZTF 2025TNSTR4991....1P N
Classification Reports
ID Time received (UT) Sender Classifier/s Group Classification Redshift Spectra Related files Assoc. Groups End prop. period Remarks ADS Bibcode
23544 2026-04-23 19:33:47 Erica Hammerstein Erica Hammerstein TRex AGN 1 TRex We report further follow-up of this object with LRIS on 2026-04-20, which reveals a spectrum consistent with an AGN. This includes strong, broad triple-peaked Balmer emission, narrow [N II] and [O III], and broad Mg II 2800 emission. 2026TNSCR1793....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
23547 2026-04-20 00:00:00 Keck1 / LRIS E. Hammerstein, R. Chornock TRex tns_2025ahbd_2026-04-20_Keck1_LRIS_TRex.flm Object
23046 2026-02-23 18:12:09 Megan Newsome Megan Newsome (UT Austin), Sebastian Gomez (UT Austin) FLEET TDE 0.336 1 2 FLEET AT2025ahbd was selected as a possible TDE by our FLEET program with a P(TDE) = 0.59 (Gomez et al., 2023, ApJ, 949, 113). The redshift of z = 0.336 was determined from host features in the spectrum. At this redshift, the absolute magnitude in the g-band is currently M_g = -21.93. We find a best match to TDEs using SNID-SAGE (Stoppa et al. in prep: https://github.com/FiorenSt/SNID-SAGE). We note that good matches are also found to SLSN-II, but the persistent blue colors and nuclear location tentatively favor a TDE interpretation. 2026TNSCR.764....1N
Related files
File Comments Last Modified (UT) Modified By
tns_2025ahbd_atrep_23046_FLEET.png Match to AT2019ahk, a TDE. 2026-02-23 18:12:09 Megan Newsome
tns_2025ahbd_atrep_23046_FLEET_0.png Match to OGLE16aaa, a TDE. 2026-02-23 18:12:09 Megan Newsome
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
23047 2026-02-16 10:29:32 HET / HET-LRS 2807 HET Megan Newsome FLEET tns_2025ahbd_2026-02-16_10-29-31.724594_HET_HET-LRS_FLEET.dat Object

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