The first Fermi-LAT >10GeV catalog (1FHL)

The time interval analyzed here is from the beginning of Fermi LAT science operations, 2008 August 4 (MET 239557447) to 2011 August 1 (MET 333849586), covering very nearly 3 yr. In this work we analyze gamma rays with energies in the range 10-500 GeV. To limit the contamination from gamma rays produced by cosmic-ray interactions in the upper atmosphere, gamma rays with zenith angles greater than 105 were excluded. To further reduce the residual gamma rays from the upper atmosphere only data for time periods when the spacecraft rocking angle was less than 52 were considered. See section 2 for further explanations. (2 data files).