Models
What Are They?
Such enormous amounts of energy suggest a gravitational source. Two popular
ideas are the merger of two black holes or the merger of two neutron stars.
However, although such events might yield the required energy, it is not clear
that they can be made consistent with all the observations. Thus, the
source of gamma ray
bursts remains one of the most important mysteries in modern cosmology.
SOURCE:
http://antwrp.gsfc.nasa.gov/apod/ap950827.html