STEREOSCOPIC OBSERVATIONS OF GAMMA-RAYS AT THE WHIPPLE OBSERVATORY

Observations of photons at E greater than or equal to 550 GeV from the Crab Nebula are presented and used to assess the potential of multi-t elescope systems for gamma-ray astronomy. The Whipple observatory 10 m and 8 m imaging atmospheric Cerenkov telescopes have been used to pro vide a stereoscopic view of air showers to make a more complete measur ement of air shower parameters. Here we present a measurement of the s pread in the arrival direction of primary gamma-rays originating from a point source. The data show that the shower arrival direction can be reconstructed with an accuracy of sigma = 0.<degrees.14. (C) 1998 Els evier Science B.V.