A tale of two pulses: Observational evidence for two distinct polarized emission sites in gamma-ray burst outflow

Gamma-ray bursts (GRBs) are the brightest explosions in the universe. In just a few seconds, they can outshine all the stars in their host galaxy combined, releasing more energy than our sun will emit over its entire lifetime. Yet, despite decades of observations, key mysteries remain unsolved: What powers the prompt emission? What is the jet’s structure? And what is it made of?