Manchester-Besançon Microlensing Simulator v2


Version 2.3 (26/05/2021)

Description Changelog Terms of use

Use the form below to obtain signal-to-noise (S/N) limited microlensing maps of the Galaxy towards the Galactic bulge. MaBμlS-2 uses the Besançon Galactic Model. See here for a brief description and see our paper for more details on the calculations.

For the magnitude range the min/max values refer to the bright and faint limit of a survey, respectively, and not the magnitude range of the source stars. The faint limit is taken to correspond to the magnitude at which the photon noise limited photometric precision is 4% within an aperture of radius 1 arcsecond. (i.e. when it is set to equal the survey zero-point magnitude an exposure time of 625 seconds is being assumed).

All maps show the parameter distributions for events that exceed the selected event peak threshold S/N -- the minimum S/N at peak magnification.

Event peak threshold S/N =
Min Property Max
Galactic longitude (°)
Galactic latitude (°)
Event duration (tE/days)
Rel. proper motion (μrel/mas yr-1)

Microlensing map
The map will be plotted for all events that have a S/N at peak magnification exceeding the selected survey limiting value, and that fall within the selected parameter intervals.
Optical depth
Average Einstein radius crossing time
Event rate per sky area
Event rate per source star

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