Gamma ray observations of the gamma ray burst object GRB 090429B supplemented by infrared observations from the Gemini North telescope and United Kingdom Infra Red Telescope, both on Mauna Kea, place the object at a redshift of z=9.4, as reported by Emily Baldwin at Astronomy Now. (Also at Cosmos by Miles Gough).
In the cosmological model, that would mean the scale of the universe was 9.6% of it's current size at the time the gamma rays and IR were emitted. (1 / z + 1).
Also, see: Cosmological Distances and Gains of Salt
Image credit: Gemini Observatory / AURA / Levan, Tanvir, Cucchiara.