Similarity of GRBs 150101B (left panel) and 170817A (right panel) in a single image: the spectrally separated waterfall plots from the GBM Targeted Search runs. Times are relative to the trigger times of the respective bursts. The four templates used here include three GRB-like spectra (the hard shown in blue, normal in green, and soft in red) and one very soft thermal template (shown in purple; kT = 10 keV). The color maps show the log likelihood ratio for that template; all are fixed to the same range. This last template was added in response to the discovery of the soft tail in GRB 170817A. The bursts are phenomenologically similar.