Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 1995
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995aas...187.4706p&link_type=abstract
American Astronomical Society, 187th AAS Meeting, #47.06; Bulletin of the American Astronomical Society, Vol. 27, p.1351
Astronomy and Astrophysics
Astronomy
5
Scientific paper
We present the results of the MACHO project alert system for 1995 and subsequent followup by GMAN (Global Microlensing Alert Network). Included in the 40+ events detected in real--time are two events that have exhibited significant deviations from the standard microlensing model of point--source and point--lens. In both cases, these deviations were detected prior to peak magnification. Observations took place at four sites on three continents in six independent passbands and were dynamically rescheduled within 24 hours throughout the events. Spectra have also been obtained near peak for both events. MACHO alert 95-12 appears to be microlensing by a binary lens and alert 95-30 is a spectacular example of lensing of a resolved source. The information available from these exotic events can provide additional constraints on the lensing system. In particular, 95-30 provides a measurement of the angular velocity of the lens thereby removing some of the degeneracy in determining the lens mass.
Alcock Charles
Allsman Robyn
Alves Daniele
Axelrod Tim
Banks Thomas
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