[vsnet-alert 3314] On-going HIGH MAGNIFICATION Microlensing Events

[User Macho <macho@astro.washington.edu>]

Dear Colleagues-
 
The MACHO project has determined 2 on-going microlensing events are
expected to peak very soon at high magnification.  The probability of
detecting planets around the lens is greatly enhanced in these high
magnification events.  Also, the brightness profile of the source
stars (limb darkening) may provide detectable deviations in the event
lightcurves.  Extensive followup observations are urgently requested.

Event                         OGLE-1999-BUL-36 (99-BLG-44)
Star ID                       308.38595.1020
RA      (J2000)               18:20:30.0
DEC     (J2000)               -21:57:04
V                             ~19.8
R                             ~18.8

A ~10.3 and rising on 31 Jul, expected peak of A ~29.6 near near Aug
3.34 UT, duration 62 +/- 2 days.


Event                         99-BLG-47
Star ID                       302.44928.3523
RA      (J2000)               18:30:49.4
DEC     (J2000)               -14:10:53
V                             ~21.5
R                             ~20.3

A ~12.3 and rising on 31 Jul, expected HIGH MAGNIFICATION peak near
Aug 4.40 UT, duration 101 +/- 8 days.


Finding charts and lightcurves are available on the web page at
http://darkstar.astro.washington.edu or ftp site
darkstar.astro.washington.edu directories macho/Alert/99-*.
 
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