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| Paper: |
Magnetically Powered Prompt Radiation and Flow Acceleration in GRB |
| Volume: |
312, Third Rome Workshop on Gamma-Ray Bursts in the Afterglow Era |
| Page: |
357 |
| Authors: |
Drenkhahn, G.; Spruit, H.C. |
| Abstract: |
Magnetic fields are natural for transmitting the energy from the central compact object to the small amount of baryons required for a GRB. If dissipation of the flux of magnetic energy by reconnection inside the flow is taken into account, the magnetic model has several more convincing properties. For baryon loading typical of observed GRB, most of the dissipation takes place just outside photosphere, so that prompt emission is produced efficiently, and the magnetic field strength in this region is high, resulting in efficient synchrotron emission. The dissipation also causes remarkably efficient acceleration of the bulk flow. In this context, an interpretation of the Poynting flux as a 'magnetic enthalpy flux' is illuminating. The transition between X-ray flashes and true GRB is predicted at I′ ≈ 100. |
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