  The scientific discoveries made by H.E.S.S. during its first year of
operation encourage a reexamination of the open problems in high energy
astrophysics and of the capabilities of the atmospheric Cherenkov technique,
which could be employed to address them. We report on an initial Monte Carlo
exploration of a ground-based instrument for observing cosmologically distant
high energy transient phenomena. Such observations would require combining an
order of magnitude increase in collecting area over existing instruments, with
a similarly large increase in field of view for routine sky monitoring, and a
factor of five decrease in energy threshold to extend the visibility range to
redshifts exceeding one. A large array of moderately sized Imaging Atmospheric
Cherenkov Telescopes (IACTs) through which the total array collecting area,
array field of view and array data rates can be distributed, appears to be able
to meet these requirements. To be practically feasible for construction,
however, a cost effective imaging solution, with resolution of ~1 minute of arc
within ~15 degrees field of view needs to be found. If image intensifier based
technology provides such a solution in future, then, combined with super-fast
parallel data processing, it may become a technological foundation for the next
breakthrough in ground-based gamma-ray astronomy.
