OGLE-2015-BLG-1319

It was discovered during June–July 2015 using the gravitational microlensing detection method through the joint effort between Swift, Spitzer Space Telescope, and the ground-based Optical Gravitational Lensing Experiment, the first time two space telescopes have observed the same microlensing event. This method was possible because of the large separation between the two spacecraft: Swift is in low Earth orbit while Spitzer is more than one AU distant in an Earth-trailing heliocentric orbit. This separation provided significantly different perspectives of the brown dwarf, allowing for constraints to be placed on some of the object's physical characteristics.^[2][3]