# Ground-based Gamma-Ray Astronomy: an Introduction

## TL;DR

Ground-based gamma-ray astronomy is a vital observational method for studying cosmic ray sources and acceleration phenomena, utilizing specialized detection techniques amidst cosmic ray backgrounds.

## Contribution

This paper introduces the experimental techniques and current ground-based gamma-ray experiments, providing an overview of the field's methodology and instrumentation.

## Key findings

- Overview of detection techniques for ground-based gamma-ray astronomy
- Description of current experiments in data collection or installation
- Insights into the role of gamma-ray observations in cosmic ray physics

## Abstract

During the last two decades Gamma-Ray Astronomy has emerged as a powerful tool to study cosmic ray physics. In fact, photons are not deviated by galactic or extragalactic magnetic fields so their directions bring the information of the production sites and are easier to detect than neutrinos. Thus the search for $\gamma$ primarily address in the framework of the search of cosmic ray sources and to the investigation of the phenomena in the acceleration sites. This note is not a place for a review of ground-based gamma-ray astronomy. We will introduce the experimental techniques used to detect photons from ground in the overwhelming background of CRs and briefly describe the experiments currently in data taking or under installation.