v3.3

• Adaptive gradients differentiated for each parameter in Levenberg-Marquardt fitting.
• Anomaly detection code to trigger initial conditions with additional lenses (thanks to Antonio Consiglio).
• Triple-lens fitting (only from anomalies on binary lens models) in static configuration, including parallax and/or orbital motion.
• Reader lists the datasets used distiguishing those taken from ground or from a satellite.
• Efficiency much higher than previous versions.

v3.1

• Upgraded to VBMicrolensing 5.3: parallax calculations based on lookup table.
• Slight revision of bumping mechanism.
• Corrected a few bugs.

v3.0

In v3.0 a whole restructuring of the code has been realized. New features are:

• Astrophotometric fits: it is now possible to include datasets with the measurement of the position of the centroid at each epoch.
• High-Resolution imaging: it is now possible to include constraints from high-resolution observations detecting lens ans source as separate objects.
• Possibility to turn-off the luminosity of the secondary source or the secondary lens, useful to fit systems with dark companions.
• Possibility to change the mass-luminosity-radius relations in binary source and lens models.
• Full access to all parameters ranges used in fitting.
• Preliminary models are now stored in a limited number of files and deleted at the end of the modeling run, unless requested otherwise.
• New plotting functions for the centroid trajectory ans options for further customization.
• Several bugs corrected.

v2.4

Update to v2.4

• Automatic detection of existing installation of VBMicrolensing at build time;
• Output of failing subprocesses shown for easy error detection;
• Bug correction in automatic cleanup of preliminary models;
• Lower boundary of q decreased to 1.e-7;
• Refinement of offset degeneracy calculation;
• New function in plotmodel to convert from fitting parameters to conventional orbital elements.

v2.3

• Update to VBMicrolensing 4.1.2;
• additional accurate initial conditions for planetary events;
• new strategy to search for offset degeneracy partners in binary-lens fits;
• changed maximal steps in each parameter in LevMar;
• ellipsoid increased by delta chi square and more accurate check of duplicates in model selection;
• models above Wilks' theorem threshold are removed in Finalizer;
• accuracy option in plotmodel;
• source trajectory and caustic in templates.show_template().
• several bug corrections in Reader, bumper, ModelSelector, LevMar;

v2.2

v2.2 with new features and optimizations

• Replaced VBBinaryLensing with VBMicrolensing
• Added the possibility to constrain fits
• possibility to choose model categories to fit
• possibility to make just a quick update to previously found models
• added Keplerian orbital motion for binary lenses as model category "LK"
• partial implementation of static triple-lenses, triple-lenses with parallax
• optimization of ModelSelector excluding higher chi square models from check
• possibility to cleanup event directory from preliminary models, thus saving 99% disk space.

v2.1

RTModel v2.1 has several new features and small optimizations:

• Possibility ro recover options from a previous run
• Fit from user-defined initial conditions
• Time limit enforced by killing stuck processes
• New functions in plotmodel subpackage for plotting light curves and caustics separately and for saving figures to file
• Full customizable template library with visualization of templates and computation of peaks for matching
• Minor optimizations for the template library, single-lens-single-source fitting, initial conditions settings.

RTModel 2.0

This is the first official release of RTModel a package for modeling microlensing events. A private version of this software has been operating since 2013 (see RTModel website).

A popular spin-off of this project was VBBinaryLensing, available as a separate public package since 2016.

Development of RTModel will continue over time with new additions in future versions.