The Gamma Ray Burst (GRB) is a signature of the most powerful
cosmological phenomenon. According to BSM-SG theory, it is either a
collapse or birth of a new galaxy. Galaxies according to BSM-SG have a
phase of active life (observable) and not observable hidden phases,
where the material formations, including the elementary particle,
recycles to lower level of matter organization and new elementary
particles are crystallized. The material particles that build our world
are distinguished from the virtual particles, which are only waves in
the physical vacuum substance. During a galaxy collapse, its space
substance breaks from the space substance of the neighboring galaxies.
This shakes their space and a powerfull shock wave is propagated
through the Universe. In case of a galaxy burth the nes born space of
the new galaxy connects to its neighbors and again a GRB is created.
Only in the second case, the GRB is followed by optical emisiion. The
GRB050904 detected on 4 Sep 2005 and the following observations of
optical emission is probably from a new-born galaxy "at the edge" of
the Universe. The estimated redshift is about z=6.4. More information
from:
arXiv:astro-ph/0509660 V1 22Sep 2005
(use google search)

See the book "Beyond the Visible Universe" by Stoyan Sarg