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An episode of ultrahigh energy radiation from the gamma -ray source Geminga: GRAPES I observations at Ooty during 1984-1987.

A study of showers arriving from the direction of the γ-ray source Geminga (1E0630 + 178) has shown evidence for emission of ultrahigh energy radiation during the one week interval October 10-16, 1986. 83 showers were observed in the source bin as against an expected background of 44.1. The probability of observing this excess based on Monte Carlo simulations is less than 10 −4 . The flux observed during this period (1.00±0.24)×10 −11 cm −2 s −1 at energies ≥10 14 eV corresponds to a time-averaged luminosity of 6×10 32 erg s −1