Overview
- An international campaign identified GRB 250314A after SVOM detected a burst on March 14, Swift rapidly localized it, and ESO’s VLT measured a redshift of 7.3, confirming a light-travel time exceeding 13 billion years.
- Cosmic time dilation stretched the event, enabling JWST to target the site on July 1, 2025 and capture the supernova near its infrared peak.
- Spectral analysis shows a close match to Type Ic-BL supernovae observed in the nearby universe rather than the distinct signatures expected from first-generation, metal-free stars.
- Webb resolved a low-mass, star-forming host galaxy consistent with systems from the epoch of reionization.
- Two peer-reviewed papers in Astronomy & Astrophysics detail the observations and set a new benchmark that will guide searches for additional early-universe supernovae.