... Tonight's Sky . ... Observing . ... Sky Events . ... Swift images its first GRB . The upstart satellite imaged a gamma-ray burst even before it was fully operational. ... F or the first time, a gamma ray burst (GRB) was imaged during its explosive act. ... According to Neil Gehrels, Swift's principal investigator at NASA's Goddard Space Flight Center in Greenbelt, Maryland, the image is the first "prompt X-ray emission from a gamma ray (burst), and Swift's first autonomous slew caught in the act." ...