K band monitoring of GRS 1915+105 during 1999/2000
  We report on long-term K band photometry of the galactic microquasar GRS 1915+105 since March 1999. We see variations of more than 1 mag, which are seemingly correlated with variations in X-ray intensity and spectral slope. 
J. Greiner (AIP Potsdam, Germany), F.J. Vrba, A.A. Henden, H.H.   Guetter, C.B. Luginbuhl (all Naval Observatory, Flagstaff,...