The PLANET collaboration has detected an anomaly in the on-going microlensing event OGLE-1999-BUL-23. Recent PLANET observations from Chile and South Africa indicate that this event brightened by apprximately 1.3 magnitudes in 7 hours on about JD 2451341.6, then apparently fell and has now risen again. The event is currently A~7.5. Future behaviour is uncertain and further observations are strongly encouraged. An anomaly alert was issued.
RA (J2000): 18:07:45.14
Dec (J2000): -27:33:15.4
The baseline I magnitude reported by the OGLE team is 17.85.
PLANET continues to observe this event. Observations by others, both photometric and spectrographic, are encouraged. A postscript finding chart can be downloaded here.
Finding charts and future updated information can be found on the PLANET web site at http://planet.iap.fr.
OGLE information on this event can be found at the OGLE alert web page at: http://www.astrouw.edu.pl/~ftp/ogle/ogle2/ews/bul-23.html.