
%0 Journal Article
%A Edwards, PG 
%A Ciampa, D 
%A Clay, RW 
%A Patterson, JR 
%T A Search for Ultra-high-energy Gamma-ray Emission from Binary X-ray Systems
%J Australian Journal of Physics
%D 1989/10/01
%V 42
%N 5
%P 581-590
%K 
%R https://doi.org/10.1071/PH890581
%U https://www.publish.csiro.au/paper/PH890581 
%X Observations have been made with the Buckland park air shower array over a two-year period from June 1984. We have examined events from the directions of six binary X-ray systems to search for any periodic component associated with ultra-high-energy gamma-ray emission above a threshold energy of -9xl014 eV. No statistically significant excess has been found and upper limits to the individual fluxes are presented. 
