A single cosmic explosion has been caught acting like two completely different types of star deaths simultaneously.
March 31, 2026
Original Paper
An Intertwined Short and Long GRB with 4-minute Separation
arXiv · 2603.28699
The Takeaway
For decades, astronomers classified explosions as either 'short' (merging stars) or 'long' (collapsing giants). This rare event produced both types from the same source just four minutes apart, shattering the standard rules we use to categorize how stars die.
From the abstract
Gamma-ray bursts (GRBs), among the most energetic transients in the Universe, are traditionally classified into long-duration GRBs (lasting more than two seconds) and short-duration GRBs (lasting less than two seconds)\cite{Kouveliotou1993}. Long-duration GRBs are typically associated with the core collapse of massive stars (Type II), whereas short-duration GRBs originate from the merger of compact binary systems (Type I)\cite{Woosley2006, Zhang2006Natur, Zhang2009b, Berger2014}. Owing to their