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                         PLANET ANOMALY UPDATE
		               2004 #10-3
                        (issued 5-Jul, 8:30 UT)
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	          More information about caustic passage



Dear Colleagues,

reduction of data collected by PLANET with the Canopus 1.0m telescope near
Hobart (Tasmania, Australia) during the two consecutive nights starting on
28-Jun and 29-Jun reveal additional important information about the observed
caustic passage.

Two points on the rise following the observed caustic entry at HJD=2453184.75
+/- 0.01 (28-Jun, 6:00 UT +/- 15 min) indicate a peak around HJD=2453185.25
(28-Jun, 18:00 UT) at more than 3.5 mag above baseline, after which the event
dropped to a magnification of 2.85 mag at HJD=2453185.55 (29-Jun, 1:10 UT)
and rose again to a peak at 3.0 mag at HJD=2453185.65 (29-Jun, 3:35 UT). 
The Tasmanian data favour a slope dicontinuity marking the end of the 
caustic passage at HJD=2453186.13 +/- 0.01 (29-Jun, 15:07 UT +/- 15 min),
so that the caustic passage lasted about 33 hours. 

The structure of the observed caustic passage is typical for events where the
source center passes close to a cusp and the leading limb starts exiting before
the trailing limb has entered.

Event:            OGLE 2004-BLG-368
RA (J2000):       17:56:14.91
Dec (J2000):      -29:36:54.2

The baseline I magnitude reported by the OGLE team is 16.677.

For more information:
PLANET:      http://planet.iap.fr/
OGLE:        http://www.astrouw.edu.pl/~ftp/ogle/ogle3/ews/blg-368.html
MicroFUN:    http://www-astronomy.mps.ohio-state.edu/~microfun/

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On behalf of the PLANET collaboration,

Martin Dominik

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