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      Stirring the Embers: High‐Sensitivity VLBI Observations of GRB 030329

      , , ,
      The Astrophysical Journal
      University of Chicago Press

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          The physics of gamma-ray bursts

          Tsvi Piran (2005)
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            Gamma‐Ray Burst Energetics and the Gamma‐Ray Burst Hubble Diagram: Promises and Limitations

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              A common origin for cosmic explosions inferred from calorimetry of GRB030329

              Past studies have suggested that long-duration gamma-ray bursts have a 'standard' energy of E(gamma) approximately 10(51) erg in the ultra-relativistic ejecta, after correcting for asymmetries in the explosion ('jets'). But a group of sub-energetic bursts, including the peculiar GRB980425 associated with the supernova SN1998bw (E(gamma) approximately 10(48) erg), has recently been identified. Here we report radio observations of GRB030329 that allow us to undertake calorimetry of the explosion. Our data require a two-component explosion: a narrow (5 degrees opening angle) ultra-relativistic component responsible for the gamma-rays and early afterglow, and a wide, mildly relativistic component that produces the radio and optical afterglow more than 1.5 days after the explosion. The total energy release, which is dominated by the wide component, is similar to that of other gamma-ray bursts, but the contribution of the gamma-rays is energetically minor. Given the firm link of GRB030329 with SN2003dh, our result indicates a common origin for cosmic explosions in which, for reasons not yet understood, the energy in the highest-velocity ejecta is extremely variable.
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                Author and article information

                Journal
                The Astrophysical Journal
                ApJ
                University of Chicago Press
                0004-637X
                1538-4357
                July 20 2007
                July 20 2007
                : 664
                : 1
                : 411-415
                Article
                10.1086/518955
                2303306a-a92f-4e7f-8037-ee25ef877ffe
                © 2007
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