Added Observation of Ongoing Microlensing Event

Details Added Observation of Ongoing Microlensing Event Added Observation of Ongoing Microlensing Event

Jul 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005sptz.prop..253g&link_type=abstract

Spitzer Proposal ID #253

Physics

Scientific paper

We request 1.5 hours of Director's Discretionary Time for an additional observation of the Target of Opportunity OGLE-2005-SMC-001. To obtain reasonable S/N with Spitzer, the source of the microlensing event had to be a red giant (or possibly a subgiant). Such MC microlensing events are quite rare. However, the event turned out to be even more unusual than we originally expected, and these unusual characteristics open up the possibility of increasing the precision of our result well beyond our original expectations, with a very modest exposure time. The event is quite long, and appears it will reach high magnification. By making this observation near peak we can break the "discrete degeneracy" that impacts the interpretation of microlensing events.

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