RA/DEC (2000)
03:42:28.389 -22:30:21.28
55.6182889176 -22.5059100987
Type
SN Ic-BL
Redshift
0.176
Discovery ReportClassification Report
Related AstroNotes: 2025-17
Reporting Group
None
Discovering Data Source
None
Discovery Date
2025-01-09 19:59:08.000
TNS AT
Y
Public
Y
Discovery Mag
20.79
Filter
g-Sloan
Reporter/s
Rob Eyles-Ferris
NEDSIMBADDECaLSPanSTARRS-1SkyMapperVizieRWISEDSSADS

Spectra

 ▌SN_2025kg - 2025-01-19 01:29:02 Gemini-S / GMOS-S (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
   Binning factor: (rounded to nearest integer >1)
Mouse hovers at WL: 0 (rest),0 (observed)

Light curves

 ▌LT_IO-O_g
 ▌BG4_BlackGEM-Cam4_BG-q
 ▌BG2_BlackGEM-Cam2_BG-q
 ▌PS1_GPC1_r
   
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
20207 2025-01-19 01:29:02 Gemini-S / GMOS-S 1600 Murilo Marinello Andrew Levan None tns_2025kg_2025-01-19_01-29-02_Gemini-S_GMOS-S_None.ecsv Object 2026-01-19
Light Curves
Filter Tel / Inst Obs-date range JD Range Photometry
g-Sloan LT_IO-O 2025-01-09 19:59:08 - 2025-01-09 19:59:08 2460685.3327315 - 2460685.3327315 1
Photometry
ID Obs-date JD Mag. / Flux Err Lim. Mag./Flux Units Filter Tel / Inst Exp-time Observer/s Remarks
462041 2025-01-09 19:59:08 2460685.3327315 20.79 0.05 ABMag g-Sloan LT_IO-O 1200
BG-q-BlackGem BG4_BlackGEM-Cam4 2025-01-07 01:51:10 - 2025-01-07 01:51:10 2460682.5771991 - 2460682.5771991 1
Photometry
ID Obs-date JD Mag. / Flux Err Lim. Mag./Flux Units Filter Tel / Inst Exp-time Observer/s Remarks
462419 2025-01-07 01:51:10 2460682.5771991 20.9 ABMag BG-q-BlackGem BG4_BlackGEM-Cam4 60 robotic [Last non detection]
BG-q-BlackGem BG2_BlackGEM-Cam2 2025-01-10 01:54:39 - 2025-01-10 01:54:39 2460685.5796181 - 2460685.5796181 1
Photometry
ID Obs-date JD Mag. / Flux Err Lim. Mag./Flux Units Filter Tel / Inst Exp-time Observer/s Remarks
462420 2025-01-10 01:54:39 2460685.5796181 19.87 0.18 20.1 ABMag BG-q-BlackGem BG2_BlackGEM-Cam2 60 robotic
r-P1 PS1_GPC1 2025-01-16 06:19:18 - 2025-01-16 06:19:18 2460691.7634 - 2460691.7634 1
Photometry
ID Obs-date JD Mag. / Flux Err Lim. Mag./Flux Units Filter Tel / Inst Exp-time Observer/s Remarks
462411 2025-01-16 06:19:18 2460691.7634 20.5 0.15 20.6 ABMag r-P1 PS1_GPC1 300 Robot
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
241172 2025-01-16 12:31:03 BlackGEM_Bot1 F. Stoppa, H. Tranin, D. Pieterse et al. BlackGEM BlackGEM 03:42:28.383 -22:30:21.35 2025-01-10 01:54:39.000 19.87 BG-q-BlackGem 1 PSN BGEM J034228.38-223021.3 BlackGEM N
Related files
File Comments Last Modified (UT) Modified By
tns_2025kg_atrep_241172_BlackGEM.pdf Finding Chart 2025-01-16 12:31:05 BlackGEM_Bot1
241167 2025-01-16 12:14:20 PS1_Bot1 K. C. Chambers, T. de Boer, J. Herman et al. Pan-STARRS Pan-STARRS 03:42:28.389 -22:30:21.28 2025-01-16 06:19:17.760 20.5 r-P1 PSN PS25ch Pan-STARRS N
240995 2025-01-11 12:01:52 Rob Eyles-Ferris Rob Eyles-Ferris 03:42:28.375 -22:30:21.13 2025-01-09 19:59:08.000 20.79 g-Sloan Other Optical counterpart to EP250108a. 2025TNSTR.151....1E N
Classification Reports
ID Time received (UT) Sender Classifier/s Group Classification Redshift Spectra Related files Assoc. Groups End prop. period Remarks ADS Bibcode
20207 2025-01-19 19:41:06 Daniele Malesani Andrew J. Levan (Radboud), Jillian C. Rastinejad (Northwestern), Daniele B. Malesani (DAWN/ NBI and Radboud), Wen-fai Fong (Northwestern), Nial R. Tanvir (Leicester) None SN Ic-BL 0.176 1 In contrast to earlier observations which showed a hot, blue continuum (Zhu et al., GCN 38908), it is now characterised by a redder shape. In addition, broad features are now visible in the spectrum with high signal to noise. Both the spectral shape and broad features resemble those found in broad-lined type Ic supernovae. Our findings find further support for the conclusions based on NOT spectroscopic observations (Xu et al., GCN 38394, and are also consistent with the optical re-brightening reported by Eyles-Ferris et al. (GCN 38983). On this basis we therefore conclude that the FXT and FBOT EP250108a is related to the core-collapse of a massive star. The earlier bright blue emission may be consistent with a rapidly cooling black body, similar to that seen in GRB/XRF 060218 (Campana et al. 2006, doi:10.1038/nature04892; Pian et al. 2006, doi:10.1038/nature05082), although it appears to last for a much longer period (days instead of hours) in the case of EP250108a. 2025TNSCR.260....1L
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
20207 2025-01-19 01:29:02 Gemini-S / GMOS-S 1600 Murilo Marinello Andrew Levan None tns_2025kg_2025-01-19_01-29-02_Gemini-S_GMOS-S_None.ecsv Object 2026-01-19

Comments

TNS
System

Thu, 01/16/2025 - 12:14

Object coordinates updated

Object coordinates updated according to AT-report 241167 of Group Pan-STARRS
Previous RA, DEC: 03:42:28.375, -22:30:21.13 (55.61823, -22.50587)
Updated RA, DEC: 03:42:28.389, -22:30:21.28 (55.6182889176, -22.5059100987)