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The challenge of identifying INTEGRAL sources on the Galactic plane

Ubertini, Pietro; Bazzano, Angela; Fiocchi, Mariateresa +6 more

The International Gamma-ray Astrophysics Laboratory (INTEGRAL) has been surveying the sky above 20 keV since its launch in 2002 providing new insights into the nature of the sources that populate our Universe at soft γ-ray energies. The latest IBIS/ISGRI survey lists 929 hard X-ray sources, of which 113 are reported as unidentified, i.e. lacking a…