Sentences with phrase «since gamma ray bursts»

«Since gamma ray bursts are usually so well behaved, this really stood out,» says radio astronomer Dale Frail of the National Radio Astronomy Observatory in Soccorro, New Mexico.

Not exact matches

Gamma ray bursts (GRBs) are believed to be the most energetic explosions in the universe since the Big Bang.

Since the early 1970s, scientists had debated the nature of gamma - ray bursts, enigmatic flashes of energetic radiation that pop off hundreds of times a year.

Since then, its discoveries have starred in ScienceNOW stories about gamma ray bursts at the fringes of the galaxy (24 April 1998), gamma ray bursts possibly spawned by black holes (15 June 1998), and gamma ray bursts that appear to lack gamma rays (20 October 1999), among others.

Swift can swivel towards gamma - ray bursts (GRBs) in less than a minute and has detected two short bursts since its launch in November 2004.

Although they did not find any dark GRBs that originated in the early universe (such as the subsequently discovered GRB 090423), the astronomers were able to estimate that ancient GRBs probably account for only around 0.2 to 0.7 per cent of all gamma - ray bursts detected since their initial discovery.

Roughly half of the GRBs detected by NASA's Swift satellite since its 2004 launch are «dark» gamma - ray bursts that are not seen in visible light (and so are virtually invisible to optical telescopes).