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The Cherenkov Telescope Array Observatory (CTAO) is a next-generationground-based gamma-ray observatory that will study the universe at very highenergy using atmospheric Cherenkov light. CTAO will comprise over 67 telescopesof three different sizes, located in the northern and southern hemispheres.Among these, the Medium-Sized Telescope (MST) will play a crucial role inCTAO's observations, providing excellent sensitivity and angular resolution forgamma rays in the energy range of 100 GeV to 5 TeV. The MST is based on amodified single-mirror Davies-Cotton design, featuring a segmented mirror witha diameter of 12 meters, a total reflective surface of 88 square meters, and afocal length of 16 meters. It will cover an approximately 8-degree field ofview and be equipped with two different cameras: NectarCAM and FlashCam, at thenorthern and southern CTAO sites, respectively. The MST's design is optimizedfor efficient observation of extended sources, including supernova remnants andpulsar wind nebulae, as well as the study of gamma-ray bursts and activegalactic nuclei. Currently, the MST is in the midst of production and testingstages with the aim of being installed in 2025 for the CTAO Pathfinder project.In this project, one MST telescope will be deployed at each CTAO site toprovide on-site experience with pre-production components. This approachfacilitates cost and risk reduction before starting serial production. Thiscontribution provides an overview of the current status and plans of the MST'sconstruction at both the northern and southern CTAO sites, as well as detailson the telescope and camera designs and their expected performance.

Status of the Medium-Sized Telescopes for the Cherenkov Telescope Array Observatory