SUMMARY OF PROPOSAL 42130 DR. GREG M. MADEJSKI NASA/GODDARD MD USA 20771 GREENBELT GREENBELT RD. E-mail: LHEAVX::MADEJSKI Tel: (301) 286-8099 Fax: Medium: 4GBDAT Subject: AGN Title: X-RAY AND SOFT GAMMA-RAY OBSERVATIONS OF SEYFERT 2 GALAXY NGC 4945 Abstract: We propose a simultaneous Asca / XTE / OSSE observation of a Seyfert 2 galaxy NGC 4945. This object, already detected by OSSE, is probably the brightest Seyfert 2 in hard X-rays. Since its primary component is bright yet heavily absorbed, NGC 4945 is the best candidate to detect the scattered fraction of the primary X-ray continuum by the same medium (most likely the hot electrons) that are likely to be responsible for the scattered broad-line flux (visible only in in polarized light), and will alow a measurement of the conditions of this medium, and in verification of the Seyfert Unified Schemes. Since the primary continuum is probably variable, even though this object was already observed by Asca, a reobservation is required to measure the primary - to - scattered X-ray ratio. Co-Is: 1 CHRIS DONE DURHAN UNIV. UK (No Co-I contact data) 2 DAVID SMITH LEICESTER UNIV. UK 3 RICHARD MUSHOTZKY NASA/GODDARD USA Target Name PRI RA Dec Time TC Off GIS SIS_Cts Obs ------------------- --- -------- -------- ---- -- --- --- ------- --- NGC4945 0 196.3646 -49.4675 20 Y Y P 0.10000 1 REMARKS: THIS OBSERVATION WILL BE CONDUCTED AT THE SAME TIME AS THE OSSE OBSERVATION, BUT THE WINDOW IS VERY LARGE (2 WEEKS). Co-Ordinated Ob: Start: Jan 2, 1996 at 00 UT Stop: Jan 16, 1996 at 00 UT