Positions of X-ray burst sources determined with the HEAO-1 scanning modulation collimator. Doxsey, R. ; Bradt, H. ; Gursky, H. ; Johnston, M. ; Schwartz, D. ; Schwarz, J. Abstract Publication: Bulletin of the American Astronomical Society Pub Date: September 1977 Bibcode: 1977BAAS....9..627D