The Optical Gravitational Lensing Experiment. Photometry of the   MACHO-SMC-98-1 Binary Microlensing Event
  We present photometry of the unique binary microlensing event MACHO-SMC-98-1 collected by the OGLE group. Particularly interesting observation was made close to the first caustic crossing which was not covered by observations of other groups. It allows to test proposed models of which Model~1 proposed by PLANET group seems to be in the best agreement with the OGLE observations. 
A. Udalski, M. Kubiak, M. Szymanski, G. Pietrzynski, P. Wozniak, and   K. Zebrun