Geminga UHE photon spectrum

The recent measurements of Geminga photon flux carried out by the ground based Cerenkov radiation techniques and EAS (extensive air showers) studies together with COS B data have been analyzed to search the form of the energy spectrum of this source. Taking into account the experimental data it is very probable that the photon energy spectrum (I(>E) ≡ E^-&szlig;) of Geminga has a cut off in high energy region or more complicated shape such as: ß = 0.8 for E ⪉ 10⁹eV, ß = 1.2 for 10⁹eV < E < 2×10¹²eV and ß = 1.6 for E ⪆ 2×10¹²eV.