NASA's Hubble and James Webb space telescopes have successfully traced the origin of a powerful gamma-ray burst (GRB) to the collision of two neutron stars. The event, designated GRB 230307A, was detected in March 2023 and is one of the brightest ever recorded.
Observations reveal the collision occurred in a galaxy that is itself undergoing a merger with another galaxy. This galactic collision triggered a wave of star formation, which over hundreds of millions of years led to the birth of the massive stars whose remnants ultimately collided as neutron stars.
The combined power of Hubble and Webb was crucial for this discovery. Webb's infrared capabilities pinpointed the host galaxy, while Hubble's ultraviolet data helped confirm the nature of the explosive event and its 'kilonova' afterglow, which is responsible for creating heavy elements like gold and platinum.
This finding provides direct evidence linking long-duration gamma-ray bursts to neutron star mergers, a connection that was previously theoretical. It offers astronomers a new understanding of how such cataclysmic events can occur in chaotic, star-forming environments created by galaxy collisions.
