X-Ray and Gamma Ray Bursts from Collapsing Stars

When the stellar magnetosphere compreses under the collapse it's magnetic field considerably increases. Charged particles will be accelerated in this field. These particles will generate radiation when moving in the magnetic field. The collapsing stars can by powerful sources of non-thermal radiation produced by the interaction of charged particles with the magnetic field. The effect can be observed by means of modern instruments. The radiation flux grows during stellar collapse by millions and can be observed as bursts of the electromagnetic radiation in wide band (from gamma ray to radio waves) with duration equal to the stellar collapse time. This flux depends on the distance to the star, its magnetic field, and the particle spectrum in the magnetosphere. The radiation fluxes are calculated for various collapsing stars with initial dip ole magnetic fields and initial powerlaw, relativistic Maxwell and Boltzmann particle energy distributions in the magnetosphere.