  The Cherenkov Telescope Array (CTA) will consist of two arrays of Imaging
Atmospheric Cherenkov Telescopes (IACTs) at the northern and southern
hemispheres. CTA will feature IACTs with mirrors of three different sizes
optimized to cover different energy ranges. The proposed sub-arrays of four
Large Size Telescopes (LST) at CTA-North and CTA-South target the lowest energy
range between around 20 GeV and 100 GeV. Thanks to their low weight of around
110 tons the LSTs can move by 180 deg in azimuth in 20 seconds for Gamma Ray
Burst (GRB) follow-up. An LST has a tessellated parabolic mirror of 23 m
diameter equipped with a system of actuators to correct for gravity-induced
deformations during data taking. Its low-weight 2 ton camera at the prime focus
has a 4.5 deg diameter, 1855 high QE PMTs and an embedded readout with 1 GSps
sampling speed designed for data acquisition rates exceeding 10 kHz. A fully
equipped LST has been installed at the CTA-North site in 2018 and is expected
to be finished commissioning during 2019. The remaining three LSTs in the north
will be installed by 2022. We will review the status of the LSTs, describe the
installation of the first LST and report on the first results of the
commissioning tests.
