SUMMARY OF PROPOSAL 71046

DR. HITOSHI NEGORO
NEGORO@POSTMAN.RIKEN.GO.JP

RIKEN
2-1 HIROSAWA
WAKO
SAITAMA JAPAN 351-0198
Tel: 048-467-9337 Fax: 048-462-4640
Medium: 4GBDAT
Subject: X-RAY BINARIES

MULTIWAVE SIMULTANEOUS OBSERVATIONS OF GX 339-4


ABSTRACT

Long-term observations with Ginga ASM, CGRO BATSE, and RXTE ASM have revealed that the black hole candidate GX 339-4 is in the high (soft) state more frequently than other black hole candidates. These observations and those of Cyg X-1 have also shown that, in these sources, a hard to soft state transition often occurs after a large flare in the hard x-ray (20-200 keV) band. Here we propose a series of ASCA observations with RXTE and BASTE and other ground based observeratries to reveal true wide band energy spectra.

CO-INVESTIGATORS
CO-I NAME INSTITUTE COUNTRY
BRAD RUBINRIKENJAPAN
TAKESHI MIHARARIKENJAPAN
PHILIPPE DUROUCHOUXCEAFRANCE
RAPHAEL LOYERCEAFRANCE
SHUANG ZHANGGSFC/NASAUSA
KEN EBISAWAGSFC/NASAUSA

TARGETS

TARGET NAMEPRIRADECTIMETCOFFGISSIS CNTOBS
1)GX 339-4
B
255.7054-48.7896
80 ks
N
Y
P
10.00000
4

TARGET 1

THIS IS CO-ORDINATE OBSERVATIONS: THE SOURCE WILL BE OBSERVED WITH ASCA, RXTE AND BASTE SIMULTANEOUSLY.