RA/DEC (2000)
19:55:42.495 +52:48:24.17
298.927062 +52.8067144
Type
SN Ia-CSM
Redshift
0.054
Discovery ReportClassification Report
Related AstroNotes: 2026-96
Reporting Group
ZTF
Discovering Data Source
ZTF
Discovery Date
2025-09-15 03:46:02.000
TNS AT
Y
Public
Y
Discovery Mag
20.2614
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

 ▌SN_2025xtq - 2026-04-02 00:00:00 P200 / NGPS (ZTF)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

 ▌ATLAS-TDO_ATLAS-05_wide
 ▌GOTO-N_GOTO-2_L
 ▌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
23420 2026-04-02 00:00:00 P200 / NGPS K-Ryan Hinds ZTF tns_2025xtq_2026-04-02_P200_NGPS_ZTF.txt Object
Light Curves
Filter Tel / Inst Obs-date range JD Range Photometry
wide-ATLAS ATLAS-TDO_ATLAS-05 2025-09-21 21:49:53 - 2025-09-21 21:49:53 2460940.40964 - 2460940.40964 1
Photometry
ID Obs-date JD Mag. / Flux Err Lim. Mag./Flux Units Filter Tel / Inst Exp-time Observer/s Remarks
519164 2025-09-21 21:49:53 2460940.40964 19 0.197 20.02 ABMag wide-ATLAS ATLAS-TDO_ATLAS-05 30 Robot
L-GOTO GOTO-N_GOTO-2 2025-09-06 02:54:13 - 2025-09-14 22:58:05 2460924.620978 - 2460933.457003 2
Photometry
ID Obs-date JD Mag. / Flux Err Lim. Mag./Flux Units Filter Tel / Inst Exp-time Observer/s Remarks
522299 2025-09-14 22:58:05 2460933.457003 19.8 0.2 ABMag L-GOTO GOTO-N_GOTO-2 180
522298 2025-09-06 02:54:13 2460924.620978 19.6 ABMag L-GOTO GOTO-N_GOTO-2 360 [Last non detection]
g-ZTF P48_ZTF-Cam 2025-09-12 09:48:28 - 2025-09-17 03:44:09 2460930.9086574 - 2460935.6556597 3
Photometry
ID Obs-date JD Mag. / Flux Err Lim. Mag./Flux Units Filter Tel / Inst Exp-time Observer/s Remarks
517910 2025-09-17 03:44:09 2460935.6556597 19.7042 0.127971 ABMag g-ZTF P48_ZTF-Cam
517909 2025-09-15 03:46:02 2460933.6569676 20.2614 0.0842102 ABMag g-ZTF P48_ZTF-Cam
517908 2025-09-12 09:48:28 2460930.9086574 20.1734 ABMag g-ZTF P48_ZTF-Cam [Last non detection]
orange-ATLAS ATLAS-MLO_ATLAS-01 2025-09-18 08:13:12 - 2025-09-18 08:13:12 2460936.8425 - 2460936.8425 1
Photometry
ID Obs-date JD Mag. / Flux Err Lim. Mag./Flux Units Filter Tel / Inst Exp-time Observer/s Remarks
519163 2025-09-18 08:13:12 2460936.8425 16.91 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
272513 2025-10-05 07:38:46 GOTO_bot D. O'Neill, G. Ramsay, K. Ackley et al. GOTO GOTO 19:55:42.537 +52:48:23.89 2025-09-14 22:58:04.800 19.8 L-GOTO Other GOTO25ihk GOTO N
270948 2025-09-22 11:54:21 ATLAS_Bot1 J. Tonry, L. Denneau, H. Weiland et al. ATLAS ATLAS 19:55:42.503 +52:48:24.26 2025-09-21 21:49:52.896 19 wide-ATLAS PSN ATLAS25lud ATLAS N
270391 2025-09-17 06:14:41 Fritz Jesper Sollerman (SU), Christoffer Fremling (Caltech), Daniel Perley (LJMU) et al. ZTF ZTF 19:55:42.495 +52:48:24.17 2025-09-15 03:46:02.000 20.2614 g-ZTF PSN ZTF25abrpnbo ZTF 2025TNSTR3746....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
23418 2026-04-03 17:59:37 Kaustav Kashyap Das Kaustav K. Das (Caltech), K-Ryan Hinds (Caltech), Daniel A. Perley (LJMU), Jesper Sollerman, Avinash Singh (Stockholm University) on behalf of the ZTF collaboration. ZTF SN Ia-CSM 0.054 1 ZTF The spectrum reveals strong H-alpha emission with a velocity of ~7500 km s⁻¹, along with prominent Ca II NIR emission. The H-alpha emission is consistent with z = 0.054 and indicates ongoing interaction with H-rich circumstellar material (CSM). The spectral properties resemble Ia-CSM events such as SN 2013dn, but with a significantly longer-lived and flat light curve. Spectrum obtained with SEDM on 2025-09-25 matches to Type Ia SN. 2026TNSCR1413....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
23420 2026-04-02 00:00:00 P200 / NGPS K-Ryan Hinds ZTF tns_2025xtq_2026-04-02_P200_NGPS_ZTF.txt Object

Comments