GLEE Tutorials

Welcome to the GLEE tutorials! These step-by-step guides take you from raw observational data to a fully sampled gravitational lens model.

Tutorial Overview

Tutorial	Topic	What you'll learn
Tutorial 0	Preliminary Data	Prepare the cutout, masks, error map, and PSF files needed for modelling
Tutorial 1	Source Plane Positions	Build and optimise your first lens model using source-plane χ²
Tutorial 2	Image Plane Positions	Refine the model using image-plane χ² for a more robust fit
Tutorial 3	Surface Brightness	Model the full arc and lens light using extended source reconstruction

:::tip Recommended order Work through the tutorials in order — each one builds on the results of the previous. By the end of Tutorial 3 you will have a complete, publication-quality lens model. :::

(Additional topics such as Modelling with Time Delays, Multiplane Modelling, and Correcting PSF will be added soon.)

Tutorial 0: Preliminary Data

How to generate the files you will need to model in GLEE

Tutorial 1: Source Plane Positions

Modelling using the intrinsic source position as constraints.

Tutorial 2: Image Plane Positions

Modelling using the observed image positions as constraints.

Tutorial 3: Surface Brightness

Modelling using the observed surface brightness as constraint.

Tutorial 4: Time Delays

Constraining lens models with measured time delays for cosmology.

Tutorial 5: Multiplane Lensing

Modeling line-of-sight structures and multiple deflector planes.