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R. M. Bandyopadhyay (NRL/NRC), K. S. Wood, P. S. Ray, M. T. Wolff, G. Fritz, P. Hertz, M. P. Kowalski, M. N. Lovellette, D. Yentis (NRL), E. Bloom, W. Focke, B. Giebels, G. Godfrey, K. T. Reilly, P. Saz Parkinson, G. Shahbad (SLAC), J. Scargle (NASA Ames), L. Titarchuk (George Mason University), USA Science Working Group Collaboration
Since its discovery in 1992, the superluminal X-ray transient GRS1915+105 has been extensively observed in an attempt to understand its behaviour. We present first results from a long-term monitoring campaign of GRS1915+105 undertaken with the USA X-ray timing experiment on the ARGOS satellite in 1999 and 2000. To date, we have obtained approximately 240 ksec of data on this Galactic black hole candidate. A variety of behaviour has been observed, including low, steady X-ray emission, rapid irregular ~10-second flaring, extended intervals of quasi-periodic flaring on a timescale of approximately 60 seconds, and short intervals of "quenching" of the X-ray emission. We also combine our data with simultaneous X-ray data from the RXTE ASM and radio data from GBI and the Ryle Telescope to examine the relationship between the X-ray and radio emission during the various types of X-ray behaviour observed.