TY - RPRT TI - An X-ray shadowgraph to locate transient high-energy celestial sources AU - Fishman, G. J. AU - Parnell, T. A. AU - Rygg, T. A. AU - Gregory, J. C. PY - 1975 UR - https://ntrs.nasa.gov/citations/19750020752 ID - 19750020752 ER -