Discovery of an X-ray afterglow associated with the γ-ray burst of 28 February 1997

  title={Discovery of an X-ray afterglow associated with the $\gamma$-ray burst of 28 February 1997},
  author={Enrico Costa and Filippo Frontera and John Heise and Marco Feroci and Jean in 't Zand and Fabrizio Fiore and Maria Nerina Cinti and Daniele Dal Fiume and Luciano Nicastro and Mauro Orlandini and Eliana Palazzi and Massimo Rapisarda and Guido Zavattini and Rieks Jager and Arvind N. Parmar and Alan Owens and Silvano Molendi and G Cusumano and Maria Concetta Maccarone and S. Giarrusso and Alessandro Coletta and Lucio Angelo Antonelli and Paolo Giommi and J. Muller and Luigi Piro and R. C. Butler},
Establishing the nature of γ-ray bursts is one of the greatest challenges in high-energy astrophysics. The distribution of these bursts is isotropic across the sky, but inhomogeneous in space, with a deficit of faint bursts. It is currently unknown whether γ-ray bursts are produced in our Galaxy or at cosmological distances. The detection and identification of counterparts at other wavelengths are seen as crucial for resolving the origin of the events. Here we report the detection by the Beppo… 

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For almost a quarter of a century1, the origin of γ-ray bursts— brief, energetic bursts of high-energy photons—has remained unknown. The detection of a counterpart at another wavelength has long been

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