Transparency of an instantaneously created electron-positron-photon   plasma
  The problem of the expansion of a relativistic plasma generated when a large amount of energy is released in a small volume has been considered by many authors. We use the analytical solution of Bisnovatyi-Kogan and Murzina (1995) for the spherically symmetric relativistic expansion. The light-curves and the spectra from transparency of an electron-positron-photon plasma are obtained. We compare our results with the work of Goodman (1986). 
D. B\'egu\'e, G.V. Vereshchagin
astro-ph.HE physics.plasm-ph