--------------------------------------------- PLANET ANOMALY ALERT 2005 #12 (issued 16-Aug-2005, 14:30 UT) --------------------------------------------- OGLE 2005-BLG-434 (also known as MOA-2005-BLG-50) shows short duration anomaly near peak Dear Colleagues, PLANET data taken with the Danish 1.54m at ESO LaSilla and the SAAO 1m at Sutherland indicate that microlensing event OGLE 2O05-BLG-434 (also known as MOA-2005-BLG-50) showed a short duration anomaly near peak at HJD=2453596.0 +-0.5 (August 13, 2005). The nature of the anomaly is unclear at the moment, possibly of extreme binary or planetary origin. In the meantime, the star has fainted by more than one magnitude relative to the peak, which was about 3 mag above baseline. (Sparse) data from the last 60 hours are again consistent with a point-lens-point-source model curve. We encourage further follow-up observations, in order to get tight constraints on the nature of this potential anomaly. A light curve plot and data files for this event are available on the PLANET webpage http://planet.iap.fr/currentevents.html, which is frequently updated. Event: OGLE 2005-BLG-434 RA (J2000.0) 18:05:07.19 Dec (J2000.0) -29:52:12.3 The baseline I magnitude reported by the OGLE team is 19.669 /- 0.007; current magnification is expected to be about 1.6mag. For more information: PLANET: http://planet.iap.fr OGLE: http://www.astrouw.edu.pl/~ftp/ogle/ -------------- On behalf of the PLANET collaboration Joachim Wambsganss %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% If you prefer not to receive further PLANET Anomaly Alerts, please send an e-mail to planet@iap.fr.