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The Angstrom Project: a new microlensing candidate

ATEL # 1863; E. Kerins (University of Manchester, UK), M. J. Darnley (Liverpool John Moores University, UK), A. M. Newsam (Liverpool John Moores University, UK), J. P. Duke (Liverpool John Moores University, UK), A. Gould (Ohio State University, USA), C. Han (Chungbuk National University, Korea) B.-G. Park (Korea Astronomy and Space Science Institute, Korea) R. A. Street (Las Cumbres Observatory, USA)
on 5 Dec 2008; 15:44 UT
Distributed as an Instant Email Notice (Microlensing Events)
Password Certification: Eamonn Kerins (

Subjects: Optical, Microlensing Events, Transients

We report the discovery of a new microlensing candidate in M31 by the Angstrom Project M31 bulge microlensing survey using the Liverpool Telescope (La Palma). The candidate was discovered using difference imaging techniques by the Angstrom Project Alert System (APAS) in a series of Sloan i'-band images of the bulge of M31.

ANG-08B-M31-06 is located at RA=00:42:39.3, Dec=+41:16:54.9 (J2000), 56.3" West and 43.7" North of the core of M31. Periodic variation has been observed at this position through the past four Angstrom observing seasons due to a bright nearby variable. The current rise appears stronger than previous variations though the close proximity of the object to the M31 core means that it is visible only on difference images and so no reliable magnitude estimate is available. The current behaviour is consistent with microlensing with a full-width half-maximum time-scale of 19.2ħ1.2days and a predicted peak occurring at MJD=54795.0ħ0.5 days.

More information, including light-curves and imaging data, is available from the Angstrom Project Alert page.

The Angstrom Project Website

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