  The soft X-ray band hosts a larger, more diverse range of variable sources
than any other region of the electromagnetic spectrum. They are stars, compact
binaries, SMBH's, the X-ray components of Gamma-Ray Bursts, their X-ray
afterglows, and soft X-ray flares from supernova. We describe a concept for a
very wide field (~ 4 ster) modular hybrid X-ray telescope system that can
measure positions of bursts and fast transients with as good as arc second
accuracy, the precision required to identify fainter and increasingly more
distant events. The dimensions and materials of all telescope modules are
identical. All but two are part of a cylindrical lobster-eye telescope with
flat double sided mirrors that focus in one dimension and utilize a coded mask
for resolution in the other. Their positioning accuracy is about an arc minute.
The two remaining modules are made from the same materials but configured as a
Kirkpatrick-Baez telescope with longer focal length that focuses in two
dimensions. When pointed it refines the hybrid telescope's arc minute positions
to an arc second and provides larger effective area for spectral and temporal
measurements. Above 10 keV the mirrors act as an imaging collimator with
positioning capability. For short duration events this hybrid focusing/coded
mask system is more sensitive and versatile than either a 2D coded mask or a 2D
lobster-eye telescope. Very wide field X-ray telescopes have become feasible as
the ability to fabricate large area arrays of CCD and CMOS detectors has
improved. This instrument's function in the soft X-ray band is similar to that
of Swift in hard X-ray band and there are a greater variety of fast transients
in the soft X-ray band. An instrument with considerably more sensitivity than
current wide field X-ray detectors would be compatible with a modest NASA
Explorer mission.
