From: Penny Sackett <planet@astro.rug.nl>
Subject: PLANET team Anomaly Alert: OGLE-2000-BUL-28
Date: Fri, 19 May 2000 17:32:50 +0200 (MET DST)

ANOMALY ALERT: Multiple Lens Microlensing in OGLE-2000-BUL-28

First posted: 19-May-2000 

Dear Colleagues,

The PLANET collaboration has detected an anomaly in the on-going microlensing 
event OGLE 2000-BUL-28. This event was announced as a "Very short duration 
event, first caustic of binary lens or variable star". 
Recently reduced PLANET data from two observing sites appear to suggest 
that this event is due to multiple lens microlensing. Two caustic crossings 
may have occured at JD-2450000= 1677 and JD-2450000= 1680. 
Since JD-2450000= 1682, the light curve is declining as might be 
expected after the exit of a caustic region.
The baseline I magnitude reported by the OGLE team is 16.98.

Event:            OGLE-2000-BUL-28
RA (J2000):         17:58:13.12
Dec (J2000):       -29:09:14.3

PLANET continues to observe this event. 

Finding charts and future updated information can be found on the 
PLANET web site at http://www.astro.rug.nl/~planet. 

OGLE information on this event can be found at the OGLE alert web page at:
http://www.astrouw.edu.pl/~ftp/ogle/ogle2/ews/2000/bul-28.