WIDE-FIELD X-RAY TELESCOPES - DETECTING X-RAY TRANSIENTS AFTERGLOWS RELATED TO GAMMA-RAY BURSTS/

The recent discovery of X-ray afterglows of GRBs opens the possibility of analyses of GRBs by their X-ray detections. However, imaging X-ray telescopes in current use mostly hat-e limited field of view. Alterna tive X-ray optics geometries achieving very large fields of view have been theoretically suggested in the 70ies but not constructed and used so far. We review the geometries and basic properties of the wide-fie ld X-ray optical systems based on one- and two-dimensional lobster-eye geometry and suggest technologies for their development and construct ion. First results of the development of double replicated X-ray refle cting fiats for use in one-dimensional X-ray optics of lobster eye typ e are presented and discussed. Optimum strategy for locating GRBs upon their X-ray counterparts is also presented and discussed.