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                        PLANET ANOMALY UPDATE
                              2004 #3-1
                      (issued 5-Jun, 14:05 UT) 
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              OGLE 2004-BLG-273 to show further anomalies 



Dear Colleagues,

following the announcement of a caustic exit in PLANET anomaly alert 2004 #3
(issued 2-Jun, 13:40 UT), PLANET managed to collect data over its course,
which lasted about 15 hours and ended at HJD-2450000 = 3159.9, 
i.e. 3-Jun 9:40 UT.  

In agreement with predictions arising from binary lens models obtained by
A. Cassan and D. Kubas, most recent data show a rise in magnification 
after the end of the caustic exit. With all currently available data, the
mass ratio between the two binary lens components cannot be unambiguously
determined, where a model involving a planetary companion appears viable.
Characteristic anomalous future behaviour which may include peaks and even
further caustic passages will resolve the true nature of this event.
Continuing dense monitoring of this event is therefore indicated.

Event:            OGLE 2004-BLG-273
RA (J2000):       17:47:14.67  
Dec (J2000):      -35:43:57.3 

The baseline I magnitude reported by the OGLE team is 19.683.

More information, including lightcurves showing the collected data, is available 
from PLANET at 'http://planet.iap.fr' or from OGLE at
'http://www.astrouw.edu.pl/~ftp/ogle/ogle3/ews/2004/blg-273.html'. 

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On behalf of the PLANET collaboration,

Martin Dominik

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