http://www.rssboard.org/rss-specification 720 http://ecuip-xtf.lib.uchicago.edu/xtf/search?f4-type%3DArtwork;f5-associated-Lesson%3DGamma%20Ray%20Tools;expand%3Dsubject;f6-subject%3DGamma%20Ray%20Burst Results for your query: f4-type=Artwork;f5-associated-Lesson=Gamma Ray Tools;expand=subject;f6-subject=Gamma Ray Burst Thu, 01 Jan 1970 12:00:00 GMT http://ecuip-xtf.lib.uchicago.edu/xtf/view?docId=grxr/twoComponentJetStream_960x540/twoComponentJetStream_960x540.dc.xml Gamma-ray bursts that are longer than two seconds are caused by the detonation of a rapidly rotating massive star at the end of its life on the main sequence. Jets of particles and gamma radiation are emitted in opposite directions from the stellar core as the star collapses. In this model, a narrow beam of gamma rays is emitted, followed by a wider beam of gamma rays. The narrow beam for GRB 080319B was aimed almost precisely at the Earth, which made it the brightest gamma-ray burst observed to date by NASA's Swift satellite. http://ecuip-xtf.lib.uchicago.edu/xtf/view?docId=grxr/twoComponentJetStream_960x540/twoComponentJetStream_960x540.dc.xml Thu, 01 Jan 1970 12:00:00 GMT http://ecuip-xtf.lib.uchicago.edu/xtf/view?docId=grxr/68168main_swift-burst_m/6168main_swift-burst_m.dc.xml An artist's concept of the Swift Gamma-Ray Burst Explorer catching a gamma-ray burst. http://ecuip-xtf.lib.uchicago.edu/xtf/view?docId=grxr/68168main_swift-burst_m/6168main_swift-burst_m.dc.xml Thu, 01 Jan 1970 12:00:00 GMT