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R. M. Bandyopadhyay (NRL/NRC), S. E. Eikenberry, B. W. Fierce (Cornell University), P. A. Charles (University of Southampton), T. Shahbaz (IAC), R. M. Wagner (Steward Observatory), S. P. Willner, E. V. Tollestrup (Harvard-Smithsonian CfA), K. Matthews, T. W. Murphy (California Institute of Technology)
We present multiwavelength monitoring of the Galactic microquasar GRS1915+105 in the infrared, X-ray, and radio bands using observations from the Whipple Observatory 1.2-m, Lowell Observatory 1.8-m, Palomar 5-m, and the United Kingdom Infrared telescopes, the Rossi X-ray Timing Explorer All-Sky Monitor, and the Green Bank Interferometer during May-September 1997. During the course of the observations, GRS1915+105 showed large-amplitude variability in all of these bands on timescales from days to months (minutes to months for the infrared band). We find no significant correlations between the radio and other wavelengths. We find that the X-ray and IR fluxes are positively correlated on timescales >1 month (>99.99% confidence level). However, on timescales <2 weeks, the X-ray and IR typically show an anti-correlation. We discuss some of the implications of these results for understanding the multiwavelength emission processes in microquasars, specifically concentrating on the possible sources of IR emission from the system.