BINARY MICROLENSING OGLE-2000-BUL-46 Observations collected by OGLE at the Las Campanas Observatory during the last night (19/20 July 2000) indicate that the OGLE-2000-BUL-46 microlensing event, classified previously as short duration single mass event, underwent a prominent second brightenning episode most likely the second caustic crossing. Thus, OGLE-2000-BUL-46 is very likely a binary event. Follow up observations are strongly encouraged !!! OGLE-2000-BUL-46 Field BUL_SC4 StarNo 746833 RA(J2000.0) 17:54:55.36 Dec(J2000.0) -29:24:59.8 Finding charts, light curve plots, photometric data (updated regularly) can be found at: http://vsnet.astrouw.edu.pl/~ogle/ogle2/ews/bul-46.html http://vsnet.astrouw.edu.pl/ogle/ogle2/ews/2000/bul-46.tar.gz regards, OGLE team.