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                        PLANET ANOMALY UPDATE
		              2005 #4-1
                      (issued 21-Jun, 12:50 UT)
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	   Source has exited caustic - light curve now flat
	    

Dear Colleagues,

the suspected early decrease in OGLE 2005-BLG-128 on 19-Jun has been 
contradicted by OGLE data collected later that night, which show that the
event was still rising. While a single point from OGLE at HJD=2453541.6211 
(20-Jun, 2:54 UT) indicates that the caustic peak has been passed, the flat
behaviour of the light curve after HJD=2453541.7849 (20-Jun, 6:50 UT), revealed
by PLANET data taken with the Danish 1.54m at ESO LaSilla, clearly shows that
the source has exited the caustic. Another data point from the same site at 
HJD=2453542.7089 (21-Jun, 5:01 UT) suggests that the light curve remained flat
since. OGLE and PLANET data collected on this event constrain the caustic
exit to have lasted < 18 h. 

Further monitoring of the event will help to constrain the binary nature of
the lens.

A light curve plot and data files for this event are available on our
webpage, which is frequently updated.

Event:           OGLE 2005-BLG-128
RA (J2000):      17:46:34.226
Dec (J2000):     -33:52:59.9 

The baseline I magnitude reported by the OGLE team is 18.765 +/- 0.004.

For more information:
PLANET:            http://planet.iap.fr
OGLE:              http://www.astrouw.edu.pl/~ftp/ogle/

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On behalf of the PLANET collaboration

Martin Dominik

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