The PLANET collaboration has detected an anomaly in the on-going
microlensing event MB-97-41 (MACHO 97-BLG-41). After a rapid decline from
a sharp peak near JD - 2450449.0 = 170, the source star exhibited
a gradual increase of a few percent above its previous post-peak
quiescent level. As of JD - 2450449.0 = 190, the event
was still above its previous quiescent level and rising slowly.
At day JD - 2450449.0 = 199 the rate of increase is much steeper.
At day JD - 2450449.0 = 202 we may have passed a caustic crossing, and
another caustic crossing is expected in the coming days (days 204-206).
This caustic crossing appears to have occured during the indicated
period; the source star is now declining
RA (J2000): 17:56:20.7
Dec (J2000): -28:47:42
Additional observations, both photometric and spectrographic are encouraged. Finding charts with PLANET-selected reference stars and updated information for this event can be found on this PLANET web site.