Gamma rays from supernova remnants

► Supernova remnants (SNRs) accelerate cosmic rays (CRS) to relativistic energies. ► Interactions of CRs leads to production of gamma-rays. ► Presently, gamma-rays are detected from a number of young and mid-age SNRs. ► But we do not have yet an answer whether SNRs are the main contributors to CRs. ► The future Cherenkov Telescope Array (CTA) can play a crucial role in this regard.