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                           Astronomy Picture of the Day   
      
       Discover the cosmos! Each day a different image or photograph of our   
         fascinating universe is featured, along with a brief explanation   
                       written by a professional astronomer.   
      
                                  2022 October 17   
      
                       X-Ray Rings Around a Gamma Ray Burst   
          Image Credit: NASA Swift Obs.; Data: B. Cenko (NASA's GSFC), A.   
       Beardmore (U. Leicester) et al.; Processing: J. Miller (U. Michigan)   
      
      Explanation: Why would x-ray rings appear around a gamma-ray burst? The   
      surprising answer has little to do with the explosion itself but rather   
      with light reflected off areas of dust-laden gas in our own Milky Way   
      Galaxy. GRB 221009A was a tremendous explosion -- a very bright   
      gamma-ray burst (GRB) that occurred far across the universe with   
      radiation just arriving in our Solar System last week. Since GRBs can   
      also emit copious amounts of x-rays, a bright flash of x-rays arrived   
      nearly simultaneously with the gamma-radiation. In this case, the   
      X-rays also bounced off regions high in dust right here in our Milky   
      Way Galaxy, creating the unusual reflections. The greater the angle   
      between reflecting Milky Way dust and the GRB, the greater the radius   
      of the X-ray rings, and, typically, the longer it takes for these   
      light-echoes to arrive.   
      
                      Tomorrow's picture: a flowering aurora   
        __________________________________________________________________   
      
          Authors & editors: Robert Nemiroff (MTU) & Jerry Bonnell (UMCP)   
               NASA Official: Phillip Newman Specific rights apply.   
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                         A service of: ASD at NASA / GSFC,   
                              NASA Science Activation   
                                & Michigan Tech. U.   
      
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