4270ef9b___The_Gamma_Ray_Bursts_Catalog__Definition
[Geometry] Dual [Definition] 
The dual region type is for GRBs that had the localization defined by two error circle regions. The dual regions are defined by the centers of the two circle region given in RA and Dec and their radii given in degrees.
GRBCAT - The Gamma-Ray Bursts Catalog
Definition