RA/DEC (2000)
05:07:55.164 -18:11:23.86
76.97985 -18.18996
Type
SN II
Redshift
0.017
Reporting Group
ASAS-SN
Discovering Data Source
ASAS-SN
Discovery Date
2025-09-26 09:36:00.000
TNS AT
Y
Public
Y
Host Name
NGC 1781
Host Redshift
0.016645
Discovery Mag
16.1
Filter
g-Sloan
Reporter/s
K. Z. Stanek, for the ASAS-SN team

Spectra

 SN_2025yrt - 2025-10-11 05:06:54 NOT / ALFOSC (NUTS2)z=
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   Binning factor: (rounded to nearest integer >1)
Mouse hovers at WL: 0 (rest),0 (observed)

Light curves

 GOTO-S_GOTO-3_L
 ASASSN-4_Leavitt_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
22187 2025-10-11 05:06:54 NOT / ALFOSC 900 V. Antoci, B.M. Sanz, J.M. Labadie-Bartz (DTU Space) T. Killestein NUTS2 tns_2025yrt_2025-10-11_05-06-54.021_NOT_ALFOSC_NUTS.dat tns_2025yrt_2025-10-11_05-06-54.021_NOT_ALFOSC_NUTS.fits Object
Light Curves
Filter Tel / Inst Obs-date range JD Range Photometry
L-GOTO GOTO-S_GOTO-3 2025-09-20 17:52:55 - 2025-09-23 16:31:51 2460939.245079 - 2460942.188789 2
Photometry
ID Obs-date JD Mag. / Flux Err Lim. Mag./Flux Units Filter Tel / Inst Exp-time Observer/s Remarks
522411 2025-09-23 16:31:51 2460942.188789 17.17 0.02 ABMag L-GOTO GOTO-S_GOTO-3 180
522410 2025-09-20 17:52:55 2460939.245079 19.8 ABMag L-GOTO GOTO-S_GOTO-3 180 [Last non detection]
g-Sloan ASASSN-4_Leavitt 2025-09-18 10:33:36 - 2025-09-26 09:36:00 2460936.94 - 2460944.9 2
Photometry
ID Obs-date JD Mag. / Flux Err Lim. Mag./Flux Units Filter Tel / Inst Exp-time Observer/s Remarks
520366 2025-09-26 09:36:00 2460944.9 16.1 ABMag g-Sloan ASASSN-4_Leavitt
520365 2025-09-18 10:33:36 2460936.94 18.4 ABMag g-Sloan ASASSN-4_Leavitt [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
272570 2025-10-06 09:17:58 GOTO_bot D. O'Neill,K. Ackley,M. Dyer et al. GOTO GOTO 05:07:55.164 -18:11:23.86 2025-09-23 16:31:51.456 17.17 L-GOTO Other GOTO24kgc GOTO N
271493 2025-09-26 23:33:52 Krzysztof Stanek K. Z. Stanek,for the ASAS-SN team et al. ASAS-SN ASAS-SN 05:07:55.238 -18:11:23.68 2025-09-26 09:36:00.000 16.1 g-Sloan PSN NGC 1781 ASASSN-25dw ASAS-SN Present in several epochs, on the rise, possible nuclear source, so could also be a TDE 2025TNSTR3873....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
22187 2025-10-11 10:36:58 Tom Killestein T. Killestein (Warwick), M. Stritzinger (Aarhus), T. Reynolds (NBI), C. Pfeffer (Hawaii), N. Morrell (LCO), C. R. Burns (Carnegie) NUTS2 SN II 0.017 1 NUTS2, POISE Photometric follow-up by POISE using the 1-m Swope Telescope indicates that supernova 2025yrt reached a peak absolute g-band magnitude of −18.4 mag (corrected for Milky Way reddening) approximately 10 days after discovery. The source has since declined to −18 mag, consistent with the post-maximum behavior of a moderately luminous Type II supernova. 2025TNSCR4076....1K
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
22187 2025-10-11 05:06:54 NOT / ALFOSC 900 V. Antoci, B.M. Sanz, J.M. Labadie-Bartz (DTU Space) T. Killestein NUTS2 tns_2025yrt_2025-10-11_05-06-54.021_NOT_ALFOSC_NUTS.dat tns_2025yrt_2025-10-11_05-06-54.021_NOT_ALFOSC_NUTS.fits Object

Comments

TNS
System

Object coordinates updated

Object coordinates updated according to AT-report 272570 of Group GOTO
Previous RA, DEC: 05:07:55.238, -18:11:23.68 (76.98016, -18.18991)
Updated RA, DEC: 05:07:55.164, -18:11:23.86 (76.97985, -18.18996)