Two articles accepted for publication in “The Astrophysical Journal Letters” report different aspects of the study of supernova SN 2025kg, which generated a so-called fast X-ray transient, a little-known event that in this case was cataloged as EP 250108a. This type of event has now been described as a sort of stifled-at-birth version of a gamma-ray burst.

Two teams of researchers with several members in common used data collected by two instruments on the Einstein Probe space telescope and other instruments to analyze the emissions from this supernova. This allowed them to propose an explanation for the fast X-ray transients (FXTs) and how they differ from gamma-ray bursts.