The COMPTON-GRO has been a NASA observatory, located in orbit around Earth from April 1991 to June 2000. This observatory was equiped with different instruments, capable to detect high-energy emission, namely gamma-rays, coming from space. You can see below an artist impression of the COMPTON-GRO satellite.

In the figure below you can see the location of each one of the 4 instruments that were part of COMPTON-GRO. The EGRET instrument, which was sensible at energies between 20 MeV and 30 GeV, was 10 times greater and had an angular and energetic resolution much better than the similar instruments available before the launch of this satellite.

It has been recently published the third catalog containing the sources detected by EGRET. We show below the positions of these sources in galactic coordinates, where the galactic plane corresponds to the horizontal line. The position of the gamma-ray source 3EG J1824-1514 has been marked with a white dot near the center of the coordinate grid. As can be seen, most of the sources are still unidentified, especially in the galactic plane zone.

For any question please contact Josep M. Paredes (josep@am.ub.es)