The effect of timing inaccuracy on the shower arrival direction

The effects of systematic errors on the shower arrival directions have been studied by shower simulations. As results, systematic and characteristic shifts in the arrival directions have been found. The azimuth direction distribution becomes non-uniform so that positive timing error creates a minimum in the distribution in the direction of the erroneous detector, and a maximum in the opposite direction. Negative error reverses the situation. The zenith angles change accordingly. The non-uniformity of the azimuth distribution is thus an indicator of timing errors in the measurement system.