Optical spectroscopic observations of low-energy counterparts of Fermi-LAT gamma-ray sources

H. A. Peña-Herazo, R. A. Amaya-Almazán, F. Massaro +15

A significant fraction of all $\gamma$-ray sources detected by the Large Area Telescope aboard the \fer\ satellite is still lacking a low-energy counterpart. In addition, there is still…