A technique of timescale analysis performed directly in the time domain has
been developed recently. We have applied the technique to studying rapid
variabilities of hard X-rays from neutron star and black hole binaries,
gamma-ray bursts and terrestrial gamma-ray flashes. The results indicate that
the time domain method of spectral analysis is a powerful tool in revealing the
underlying physics in high-energy processes in objects.Comment: 7 pages, 4 figures. Invited talk at the 6th Pacific Rim Conference on
Steller Astrophysic
