NASAs Swift and Fermi Missions Detect Exceptional Cosmic Blast
An unusually brilliant and long-lasting pulse of high-energy radiation swept over Earth Sunday, October 9, charming astronomers around the globe. The intense emission got here from a gamma-ray burst (GRB) probably the most highly effective class of explosions within the universe that ranks among the many most luminous occasions recognized.
Every week in the past, on Sunday morning Eastern time, a wave of X-rays and gamma rays handed by means of the photo voltaic system. It triggered detectors aboard NASAs Fermi Gamma-ray Space Telescope, Neil Gehrels Swift Observatory, and Wind spacecraft, as well as others. Around the world, telescopes were turned to the site to study the aftermath, and new observations continue.
Called GRB 221009A, the explosion provided an unexpectedly exciting start to the 10th Fermi Symposium, a gathering of gamma-ray astronomers now underway in Johannesburg, South Africa. Its safe to say this meeting really kicked off with a bang everyones talking about this, said Judy Racusin, a Fermi deputy project scientist at NASAs Goddard Space Flight Center in Greenbelt, Maryland, who is attending the conference.
Astronomers suppose GRB 221009A represents the beginning of a brand new black hole formed within the heart of a collapsing star. As illustrated here, the black hole drives powerful jets of particles traveling near the speed of light. The jets pierce through the star, emitting X-rays and gamma rays as they stream into space. Credit: NASA/Swift/Cruz deWilde
Originating from the direction of the constellation Sagitta, the signal traveled an estimated 1.9 billion years to reach Earth. Many astronomers believe it represents the birth cry of a new black hole, one that formed in the heart of a massive star collapsing under its own weight. In these circumstances, a developing black hole drives powerful jets of particles traveling near the speed of light. The energetic jets pierce through the star, emitting X-rays and gamma rays as they stream into space.
The burst also provided a long-awaited inaugural observing opportunity for a link between two experiments on the International Space Station (ISS) NASAs NICER X-ray telescope and a Japanese detector called the Monitor of All-sky X-ray Image (MAXI). Activated in April, the connection is dubbed the Orbiting High-energy Monitor Alert Network (OHMAN). It allows NICER to rapidly turn to outbursts detected by MAXI, actions that previously required intervention by scientists on the ground.
OHMAN provided an automated alert that enabled NICER to follow up within three hours, as soon as the source became visible to the telescope, said Zaven Arzoumanian, the NICER science lead at Goddard. Future opportunities could result in response times of a few minutes.
The light from this ancient explosion brings with it valuable new insights into stellar collapse, the birth of a black hole, the behavior and interaction of matter near the speed of light, the conditions in a distant galaxy and much more. Astronomers may not detect another GRB this bright for decades.
Fermis Large Area Telescope (LAT) detected the burst for more than 10 hours, according to a preliminary analysis. One reason for the bursts exceptional brightness and longevity is that, for a GRB, it lies relatively close to us.
This burst is much closer than typical GRBs, which is exciting because it allows us to detect many details that otherwise would be too faint to see, said Roberta Pillera, a Fermi LAT Collaboration member who led initial communications about the burst and a doctoral student at the Polytechnic University of Bari, Italy. But its also among the most energetic and luminous bursts ever seen regardless of distance, making it doubly exciting.