From planet@astro.rug.nl Thu Aug  5 00:17:17 MET 1999
Subject: PLANET team Anomaly Alert: MACHO 99-BLG-047
Date: Thu, 5 Aug 1999 00:15:58 +0200 ()

Dear Colleagues,

The PLANET collaboration has detected an anomaly in the on-going 
microlensing event MACHO 99-BLG-47.  PLANET photometric data between 
JD - 2450000 = 1391 and 1396 from two southern observing sites indicate 
that the event has undergone an increase in brightness of 0.7 magnitude  
that is inconsistent with single-source single-lens microlensing. 
The anomalous behaviour is likely due to multiple lens microlensing,  
including a possible caustic approach or crossing near 
JD - 2450000 = 1394.2 +/- 0.2.   The event is currently changing very 
little in brightness; future behaviour is uncertain.

Event:		MB-99-047 (MACHO 99-BLG-47)
RA  (J2000):  	18:30:49.4
Dec (J2000):   -14:10:53

The baseline V and R magnitudes reported by the MACHO team are 21.5 
and 20.3, respectively, although MACHO also notes that the event may be 
significantly blended.  The event is now about 16-20 times brighter than 
its total baseline brightness; its true source magnification may be 
significantly higher.

PLANET continues to observe this event. 
Further photometric monitoring is encouraged in order to characterize 
the nature of the binary and provide early warning for possible 
future caustic events.  

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

MACHO information on this event can be found at the MACHO alert
web page at: http://darkstar.astro.washington.edu