The discovery and observations of the hard x-ray transient source GRS 1009-45 by the WATCH instrument of the GRANAT observatory Lapshov, I. Yu. ; Sazonov, S. Yu. ; Syunyaev, R. A. ; Brandt, S. ; Castro-Tirado, A. ; Lund, N. Abstract Publication: Astronomy Letters Pub Date: March 1994 Bibcode: 1994AstL...20..205L