Study on angular resolution of GRAPES-3 array

GRAPES-3 experiment at Ooty in India, constitutes of about 300 scintillator detectors, is a conventional air shower array which detects air showers produced by primary high energy cosmic rays. The detectors are placed in a equilateral trian- gle shape with distance of 8m. Good anglar resolution is required for search of gamma ray point sources that is one of the main goal of GRAPES-3. Hence, the relative arrival time of particle in an air shower plane arriving at each detectors is an important parameter which is effectively used for thei recon- struction of arrival direction of primary particles. Here, we will discuss on the angular resolution of the present GRAPES-3 experiment by using the two important methods such as EvenOdd and RightLeft methods. The new results obtained from the above two methods have been compared with the outcome of the Moon and the Sun shadow observation, and will be presented elaborately.