Observations of pointlike sources of ultrahigh energy with the MSU EAS array

Observations of extensive air showers (EASs) in Cygnus and Hercules made using the Moscow State University (MSU) EAS array during four seasons starting in the fall of 1984 are briefly reviewed. The operation time of the array and the numbers of showers recorded during each of the seasons are presented for Cyg X-1, Cyg X-2, Cyg X-3, and Her X-1 along with the expected numbers of showers. An analysis is also made of the 10-GeV and higher muon contents from the Cyg X-1 bin observed in 1985-86, when the highest excess over the background occurred. 21 refs.