TNS Classification Report No. 21958 [ 2025TNSCR3545....1C ]

Date Received (UTC): 2025-09-03 13:49:30
Sender: Gregory Corcoran
Group: None

G. Corcoran (UCD), A. J. Levan (Radboud and Warwick), D. B. Malesani (DAWN/NBI and Radboud), A. Martin-Carrillo (UCD), P. G. Jonker (Radboud), R. A. J. Eyles-Ferris (Leicester), V. Vuolteenaho (NOT and Oulu Univ.), M. Pursiainen (Warwick), I. Worssam (Birmingham) report/s a classification of object: SN 2025wkm

Type: SN Ic-BL
Redshift: 0.12

Remarks: The spectrum shows features consistent with broad-lined type Ic supernovae at a comparable phase, though with an excess of flux on the blue end, providing a good match to the super-luminous SN 2011kl (associated with GRB 111209A; Greiner et al. 2015, doi:10.1038/nature14579) near peak.

The following Classification spectrum was provided:

Obsdate: 2025-09-03 04:37:19
Instrument: ALFOSC
Telescope: Nordic Optical Telescope

Remarks: Spectrum was taken approximately 6.9 days post the associated Einstein Probe trigger using grism 4 and consisted of 4 x 900s exposures.

Details of the object and its spectra can be viewed here: https://www.wis-tns.org/object/2025wkm