CANGAROO-II event samples
Images of the Cherenkov light flashes taken by the photomultiplier
camera at the prime focus.
Squares represent each photomultipliers: they are colored
if they contain signals. The left panel shows the signal timings
and the right panels shows the signal strength.
A sample of a cosmic-ray shower which is a background for gamma-ray
observation.
A sample of a gamma-ray candidate event.
It is sharper than cosmic ray events and the elongated image
directs toward the center of the field-of-view.