SEE PROFILE

We present multi-wavelength observations of the afterglow of the short GRB 111117A, and follow-up observations of its host galaxy. From rapid optical and radio observations, we place limits of r 25.5 mag at δt ≈ 0.55 days and Fν(5.8 GHz) 18 μJy at δt ≈ 0.50 days, respectively. However, using a Chandra observation at δt ≈ 3.0 days we locate the absolute position of the X-ray afterglow to an accuracy of 0.′′22 (1σ), a factor of about six times better than the Swift/XRT position. This allows us to robustly identify the host galaxy and to locate the burst at a projected offset of 1.′′25 ± 0.′′20 from the host centroid. Using optical and near-IR observations of the hos