SUMMARY OF PROPOSAL 41052 MR YOSHIHIRO UEDA ISAS KANAGAWA JAPAN 229 SAGAMIHARA 3-1-1 YOSHINODAI E-mail: UEDA@ASTRO.ISAS.AC.JP Tel: 0427-51-3911 EXT.2622 Fax: 0427-59-4253 Medium: 2.5GB8MM Subject: X-RAY BINARIES Title: MULTI WAVELENGTH OBSERVATION OF GRO J1655-40 Abstract: We propose to observe the galactic superluminal source GRO J1655-40 (Nova Scorpius 1994) simultaneously with radio, optical, X-ray (ROSAT/ASCA/XTE) and gamma-ray (BASTE/OSSE). Among three known galactic jet objects, GRO J1655-40 is the unique source identified as a blackhole candidate through mass determination by optical observation. It is the best target to study the X-ray emission mechanism of blackhole, the origin of jet, and its relation to AGN. The campaign will be done during the next outburst predicted to occur on 1996 Mar 18. We request to cover the full orbital phase to observe the eclipse. Our ASCA observation should provide the key information to understand the object. Co-Is: 1 HAJIME INOUE ISAS JAPAN INOUE@ASTRO.ISAS.AC.JP 0427-51-3911 (2615) 2 FUMIAKI NAGASE ISAS JAPAN 3 TADAYUKI TAKAHASHI ISAS JAPAN 4 TARO KOTANI ISAS JAPAN 5 YASUO TANAKA MPE GERMANY 6 S.N. ZHANG USRA USA 7 B.A. HARMON MSFC USA 8 C. BAILYN YALE UNIVERSITY USA 9 R. HJELLMING NRAO USA Target Name PRI RA Dec Time TC Off GIS SIS_Cts Obs ------------------- --- -------- -------- ---- -- --- --- ------- --- GRO J1655-40 1 253.5000 -39.8454 100 Y Y P 100.00000 1 Co-Ordinated Ob: Start: Mar 10, 1996 at 00 UT Stop: Mar 23, 1996 at 00 UT