Montana State University, USA
Title: Collapsar model for the central engine of gamma ray bursts
Biography: Sachiko Tsuruta
Gamma ray bursts (GRB) are ultra-luminous events occurring throught the universe, which flood an almost dark gamma-ray sky for a short period of time, a few to several hundred seconds. The currently accepted interpretation of this phenomenon is that a few solar rest mass worth of gravitational energy is released in a very short period in very small regions in an enormous explosion. It is caused by either the merger of two compact objects or collapse of a massive star. I will review the latter case, generally known as a collapser model of GRB, in my presentation.