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The Angstrom Project: M31 microlensing alert ANG-08B-M31-07

ATEL # 1872; M. J. Darnley (Liverpool John Moores University, UK), E. Kerins (University of Manchester, 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 10 Dec 2008; 17:08 UT
Password Certification: Eamonn Kerins (

Subjects: Optical, Microlensing Events, Transients

We report an ongoing microlensing candidate in M31 by the Angstrom Project M31 bulge microlensing survey using the Liverpool Telescope (La Palma). The candidate was detected from difference imaging photometry generated by the Angstrom Project Alert System (APAS) in a series of Sloan i'-band images of the bulge of M31.

ANG-08B-M31-07 is located at RA=00:42:42.8 Dec=+41:13:26.2 (J2000). Baseline behaviour appears to be flat through four seasons of Angstrom data (2004-2007) and a further four seasons of POINT-AGAPE legacy data (1999-2002). The current variation is relatively faint and no reliable baseline magnitude estimate is available. As at December 8.801 2008 (UTC) the light-curve of this object is rising and is consistent with an ongoing microlensing event but with a long predicted full-width half-maximum time-scale of 403 days and a predicted peak at MJD=54802.11.1 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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