New telescope finds that the high-energy share of gamma-ray bursts arrive at Earth significantly later than the low-energy portion
Editor’s note: This story was updated February 19 after Michael Briggs of NASA’s Goddard Space Flight Center in Greenbelt., Md., reported that the gamma-ray burst known as GRB 080916C is the most energetic burst known.
VANCOUVER, Canada — Curtain up! Light the lights! In its first four months of monitoring the heavens from orbit, NASA’s Fermi Gamma-ray Space Telescope has unveiled the activity of celestial objects that emit powerful gamma rays — photons that pack 20 million to more than 300 billion t