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.