Enduring ‘Radio Rebound’ Powered by Jets from Gamma-Ray Burst

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Enduring ‘Radio Rebound’ Powered by Jets from Gamma-Ray Burst

Enduring ‘Radio Rebound’ Powered by Jets from Gamma-Ray Burst

Astronomers using ALMA studied a cataclysmic stellar explosion known as a gamma-ray burst, or GRB, and found its enduring “afterglow.” The rebound, or reverse shock, triggered by the GRB’s powerful jets slamming into surrounding debris, lasted thousands of times longer than expected. These observations provide fresh insights into the physics of GRBs, one of the universe’s most energetic explosions.

Credit: NRAO/AUI/NSF; S. Dagnello

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False color image of protoplanetary disks side by side. Left is a ring disk showing blue scattered outer ring, green inner rings with gaps, and a yellow core. Center is a transition disk with a thin outer blue ring and thin green and yellow rings, and a large empty cavity in the center. Right is a compact small disk with thin blue and green rings, and a large inner yellow core with no gaps.

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The National Radio Astronomy Observatory is a facility of the National Science Foundation operated under cooperative agreement by Associated Universities, Inc.
	Founded in 1956, the NRAO provides state-of-the-art radio telescope facilities for use by the international scientific community. NRAO telescopes are open to all astronomers regardless of institutional or national affiliation. Observing time on NRAO telescopes is available on a competitive basis to qualified scientists after evaluation of research proposals on the basis of scientific merit, the capability of the instruments to do the work, and the availability of the telescope during the requested time. NRAO also provides both formal and informal programs in education and public outreach for teachers, students, the general public, and the media.
	The National Science Foundation (NSF) is an independent federal agency created by Congress in 1950 "to promote the progress of science; to advance the national health, prosperity, and welfare; to secure the national defense..."
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