  We present results on two different Gaia-related topics. First, we describe
our efforts to calibrate the three Gaia photometric passbands G, G_BP, and
G_RP. We have built a new spectrophotometric HST/STIS library and used it to
derive new sensitivity curves and zero points for the three bands, including
recipes on how to correct some cases. Second, we present our results on
Galactic runaway stars using Gaia DR1 proper motions: we detect 76 runaway
stars, 17 (possibly 19) of them not previously identified as such.
