Left: Chandra 0.5–8.0 keV X-ray image of GRB 170817A at 15.6 days post-burst, in a 93.4 ks observation from Haggard et al. (2017). X-ray emission from GRB 170817A is clearly detected, along with the host galaxy NGC 4993 and two other sources in the field. Chandra observations beyond this observations were Sun-constrained until early 2017 December. Middle: a subsequent 98.8 ks Chandra image at ∼109.2 days post-burst, immediately after Sun constraints were lifted. The X-ray emission from GRB 170817A is still detected and has brightened. Right: a difference image in which the 15.6 day image is subtracted from the 109.2 day image, scaled by their respective exposures. GRB 170817A is clearly brightening, as indicated by its excess emission (white), while the emission deficit (black) from the variable source CXOU J130948 indicates its decrease in flux. All images are shown on a linear scale, smoothed with a 2-pixel Gaussian kernel.