Stefan Immler, Swift, GSFC, NASA Larger and jumbo X-ray images of GRB 090423's afterglow (image is 6.3 arcminutes wide). (members.nova.org)
Project leader Celine d'Orgeville explains that Gemini's Multi-Conjugate Adaptive Optics (MCAO) system should allow the observatory's 8.1 - metre aperture to record ultrasharp views over fields up to 2 arcminutes across [1/15 of the apparent width of the moon]. (newscientist.com)
Those atoms then fluoresce at the same wavelength to create five artificial stars, each about 1 arcsecond across, at the corners and center of a 1 - arcminute square. (newscientist.com)