Abstract
WE have investigated the gamma-ray emission from the Crab Nebula in a series of balloon flights of a multiplate spark chamber triggered by a Cerenkov detector-scintillator coincidence system1. The previously quoted gamma-ray energy threshold for pulsed emission from the Nebula and NP 0532 (refs. 1, 2) is ∼50 MeV; a detailed investigation of the telescope efficiency as a function of energy has now shown that the efficiency extends down to 20 MeV.
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