Fermi-LAT gamma-ray map using data with E > 1 GeV from the time period and selection criteria stated in the text. The figure uses Galactic coordinates and Mollweide projection with the Galactic center in the middle. The rectangle and zoom displays an example 10° ×10° patch that we use as input to the detection algorithm. The sky is evenly distributed into these patches based on the HEALPix pixelization scheme. The all-sky and zoom-in image have been smoothed with a 1° Gaussian kernel.