Left plot: map of significances of the gamma ray emission using the formalism proposed by Li & Ma (1983) in the region around FRB150418. The circle in the center has a diameter of 0.24° and denotes the width of the Parkes beam in which the burst was observed. Right plot: distribution of significances (black histogram) compared to the distribution obtained by excluding a circular region of 0.25° radius (red histogram). The red line and the shown parameters correspond to a Gaussian function fit to the latter distribution.