On the nature of the unidentified X-ray/gamma-ray sources IGR   J18027-1455 and IGR J21247+5058
  We present a multiwavelength study of the environment of the unidentified X-ray/gamma-ray sources IGR J18027-1455 and IGR J21247+5058, recently discovered by the IBIS/ISGRI instrument, onboard the INTEGRAL satellite. The main properties of the sources found inside their position error circles, give us clues about the nature of these high-energy sources. 
J.A. Combi, M. Ribo, I.F. Mirabel