The Role of Ground-Based Robotic Observatories in Satellite Projects

Figure 1

The distribution of optical 𝑉 magnitudes of optically identified INTEGRAL gamma-ray sources. Most are brighter than mag 20, and more than half are brighter than mag 15. Legend dark blue = mag 2–6, orange = mag 5–10, yellow = mag 10–14, green = mag 14–18, purple = mag 18–22, light blue = mag 22–26. The numbers in the plot indicate number of objects with optical 𝑉 magnitude within the indicated range.