The instrument in question is the gamma ray burst monitor (GBM) on the Fermi gammay ray telescope. The GBM does provide some directional data but because it's a

The instrument in question is the gamma ray burst monitor (GBM) on the Fermi gammay ray telescope. The GBM does provide some directional data but because it's an all-sky instrument it is fairly crude but not terrifically so, it's able to determine the direction of a signal to within several degrees.