RA/DEC (2000)
09:14:41.702 +15:42:08.26
138.673758 +15.7022957
Type
TDE
Redshift
0.089
Discovery ReportClassification Report
Related AstroNotes: 2025-102
Reporting Group
ALeRCE
Discovering Data Source
ZTF
Discovery Date
2025-03-19 05:08:19.000
TNS AT
Y
Public
Y
Host Name
SDSS J091441.71+154208.3
Discovery Mag
19.4248
Filter
g-ZTF
Reporter/s
A. Munoz-Arancibia, G. Pignata, F.E. Bauer, F. Forster, A. Mourao, S. Jurado, L. Hernandez-Garcia, L. Galbany, J. Silva-Farfan, R. Dastidar, J.P. Brandt, A. Alvarez, G. Cabrera-Vives, R. Carrasco-Davis, P.A. Estevez, B. Gamboa, P. Huijse, H. Larranaga, C. Mansilla, K. Medina, D. Moreno, E. Munoz, I. Reyes, P. Sanchez-Saez, D. Rodriguez-Mancini, M. Catelan, S. Eyheramendy, M.J. Graham on behalf of the ALeRCE broker
NEDSIMBADDECaLSPanSTARRS-1SkyMapperVizieRWISEDSSADS

Spectra

 ▌TDE_2025eve - 2025-03-26 00:45:06 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
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▌Show N II at z=vexp= km/s
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▌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
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▌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
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▌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

 ▌ATLAS-CHL_ATLAS-04_cyan
 ▌P48_ZTF-Cam_r
 ▌P48_ZTF-Cam_g
 ▌ATLAS-MLO_ATLAS-01_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
20662 2025-03-26 00:45:06 NOT / ALFOSC 1200 Niko Pyykkinen Panos Charalampopoulos None tns_2025eve_2025-03-26_00-45-05.942_NOT_ALFOSC_None.ascii tns_2025eve_2025-03-26_00-45-05.942_NOT_ALFOSC_None.fits Object
Light Curves
Filter Tel / Inst Obs-date range JD Range Photometry
cyan-ATLAS ATLAS-CHL_ATLAS-04 2025-03-25 03:41:49 - 2025-03-25 03:41:49 2460759.65404 - 2460759.65404 1
Photometry
ID Obs-date JD Mag. / Flux Err Lim. Mag./Flux Units Filter Tel / Inst Exp-time Observer/s Remarks
478849 2025-03-25 03:41:49 2460759.65404 18.836 0.196 19.09 ABMag cyan-ATLAS ATLAS-CHL_ATLAS-04 30 Robot
r-ZTF P48_ZTF-Cam 2025-03-16 06:17:13 - 2025-03-16 06:17:13 2460750.761956 - 2460750.761956 1
Photometry
ID Obs-date JD Mag. / Flux Err Lim. Mag./Flux Units Filter Tel / Inst Exp-time Observer/s Remarks
476923 2025-03-16 06:17:13 2460750.761956 20.0453 ABMag r-ZTF P48_ZTF-Cam 30 Robot [Last non detection] Data provided by ZTF
g-ZTF P48_ZTF-Cam 2025-03-19 05:08:19 - 2025-03-19 05:08:19 2460753.7141088 - 2460753.7141088 1
Photometry
ID Obs-date JD Mag. / Flux Err Lim. Mag./Flux Units Filter Tel / Inst Exp-time Observer/s Remarks
476924 2025-03-19 05:08:19 2460753.7141088 19.4248 0.124745 20.3278 ABMag g-ZTF P48_ZTF-Cam 30 Robot Data provided by ZTF
orange-ATLAS ATLAS-MLO_ATLAS-01 2025-03-24 09:09:05 - 2025-03-24 09:09:05 2460758.88131 - 2460758.88131 1
Photometry
ID Obs-date JD Mag. / Flux Err Lim. Mag./Flux Units Filter Tel / Inst Exp-time Observer/s Remarks
478848 2025-03-24 09:09:05 2460758.88131 19.5 ABMag orange-ATLAS ATLAS-MLO_ATLAS-01 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 Related files AT Type Host name Internal name Assoc. Groups End prop. period Remarks ADS Bibcode Unreal Auto classification
249873 2025-03-25 15:24:33 ATLAS_Bot1 J. Tonry,L. Denneau,H. Weiland et al. ATLAS ATLAS 09:14:41.739 +15:42:08.77 2025-03-25 03:41:49.056 18.836 cyan-ATLAS PSN ATLAS25dbl ATLAS N
248911 2025-03-19 17:54:16 ALeRCE A. Munoz-Arancibia,G. Pignata,F.E. Bauer et al. ALeRCE ZTF 09:14:41.702 +15:42:08.26 2025-03-19 05:08:19.000 19.4248 g-ZTF PSN SDSS J091441.71+154208.3 ZTF25aajfjhm ZTF Early SN candidate (g-rise > 0.06+-0.01 mag/day) classified using ALeRCE's stamp classifier (Carrasco-Davis et al. 2021) and the public ZTF stream. Discovery image and light curve in http://alerce.online/object/ZTF25aajfjhm 2025TNSTR1042....1M N
Classification Reports
ID Time received (UT) Sender Classifier/s Group Classification Redshift Spectra Related files Assoc. Groups End prop. period Remarks ADS Bibcode
20662 2025-03-28 17:18:42 Panos Charalampopoulos Panos Charalampopoulos None TDE 0.089 1 2 We report the tentative classification of AT2025eve as a Tidal Disruption Event (TDE) based on an optical spectrum obtained with the Nordic Optical Telescope on 2025-03-25 (i.e., MJD 60760.03). The transient is rising and is coincident with the nucleus of the host galaxy. At a redshift of 0.089, we identify strong absorption lines of CaII H&K, the Balmer series, and NaI D. We tentatively detect broad Halpha, and a blend of broad Hbeta, HeII 4686 and potentially NIII. Comparison with a library of transient spectra using NGSF (Next Generation SuperFit; AstroNote 2022-191, Howell et al. 2005 2005ApJ...634.1190H), returns matches with different transient types dominated by the host galaxy contribution. The best match is with a TDE (2019qiz) that was 23 days post its peak however. We also have a good match with iPTF16fnl 1 day before its peak, however this was a faint TDE while AT2025eve is currently at an absolute g-band magnitude of Mg ~ -19.5 (based on our redshift estimate and corrected for MW extinction; Av=0.087). The last g-r colour was ~ -0.26. We note that the target got independently selected as a candidate TDE by the Neural Engine for Discovering Luminous Events (NEEDLE) classifier (Sheng et al. 2024; DOI: 10.1093/mnras/stae1253), a machine-learning tool for identifying rare astronomical transients from real-time alerts. In their Astronote (#2025-102), they report that the u-g colour of the transient is u-g = -0.15 +/- 0.04, further supporting the TDE interpretation for AT2025eve. 2025TNSCR1196....1C
Related files
File Comments Last Modified (UT) Modified By
tns_2025eve_atrep_20662.pdf Classifications were done using NGSF (Next Generation SuperFit; AstroNote 2022-191, Howell et al. 2005 2005ApJ...634.1190H). 2025-03-28 17:18:42 Panos Charalampopoulos
tns_2025eve_atrep_20662_0.pdf Classifications were done using NGSF (Next Generation SuperFit; AstroNote 2022-191, Howell et al. 2005 2005ApJ...634.1190H). 2025-03-28 17:18:42 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
20662 2025-03-26 00:45:06 NOT / ALFOSC 1200 Niko Pyykkinen Panos Charalampopoulos None tns_2025eve_2025-03-26_00-45-05.942_NOT_ALFOSC_None.ascii tns_2025eve_2025-03-26_00-45-05.942_NOT_ALFOSC_None.fits Object

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