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                        PLANET ANOMALY ALERT
		              2004 #11
                      (issued 15-Jul, 8:30 UT) 
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                Caustic exit in OGLE 2004-BLG-373 now? 



Dear Colleagues,

recent data collected by PLANET with the Danish 1.54m telescope at ESO LaSilla
(Chile) on the event OGLE 2004-BLG-373 indicates that a caustic exit may be
happening NOW with the source center passing the caustic at HJD=2453201.8474
(15-Jul, 8:20 UT). However, this estimate is strongly biased by a single data
point and the expected caustic exit may happen only in a few days time.
    
Frequent photometric measurements during the course of the caustic exit can 
be used to obtain a measurement of the proper motion between lens and source 
and allow to measure the brightness profile of the source. A good coverage 
will reduce uncertainties in the properties of the binary lens system
and in particular allow a lens mass measurement if parallax effects can
be assessed properly. 

Event:            OGLE 2004-BLG-373
RA (J2000):       17:54:44.95  
Dec (J2000):      -30:00:50.4 

The baseline I magnitude reported by the OGLE team is 18.327.

For more information:
PLANET:  http://planet.iap.fr/currentevents.html 
OGLE:    http://www.astrouw.edu.pl/~ftp/ogle/ogle3/blg-373.html 

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On behalf of the PLANET collaboration,

Martin Dominik

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