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Old Q0957+561 data & software: 

► Optical Monitoring

► HST-STIS Spectra

► Simple FORTRAN programs to apply the d² test (accurate and robust time delay measurements)

Postgraduate Course on GL

ANGLES SCHOOL POSTER-PDF

Workshop 2004

WORKSHOP POSTER-PDF

   ► Photos

   ► Proceedings

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TELESCOPES

BINOCULARS

Introduction to GL

• (i)          Brief historical introduction

• (ii)         The lens equation

• (iii)        Magnification & Critical curves

•  (iv)        Time delay

• (v)         Simple lens models

• (vi)        Microlensing

• (vii)       Intrinsic Variability of quasars

• (viii)      References