In this case, astronomers using the European Southern Observatory's 2.2m telescope at La Silla and Very Large Telescope at Paranal (both in Chile) targeted the afterglow.
The telescope is operated by the European Southern Observatory (Eso) organisation, which oversees the La Silla facility and the Very Large Telescope (VLT), which is also in Chile.
"Eso's La Silla Observatory on the outskirts of the Atacama Desert is certainly one of the best astronomical sites in the world, " said Michael Gillon, who leads the exoplanet survey for Trappist.