Umbral brightening of September 30, 2012 in selected AIA bands. 1600 and 304 Å images are at the peak of the brightening, 94, 335, and 211 Å images are at the peak of the associated coronal loop. 94 and 335 Å images are 1-min averages to reduce noise. The bottom row shows difference images. The first column shows HMI images of continuum intensity and longitudinal magnetic field. The time evolution of this loop and its footpoins is shown in movie 2 of the electronic version of the journal. Each frame of the movie shows difference images in the 1600 and 304 Å bands (top row) as well as in the 94 and 335 Å AIA bands (bottom row).