Abstract
An 80-second gamma-ray burst was detected over the energy range 42-205 keV by a balloon-borne gamma-ray telescope at 23:00:22 UT on May 11, 1988. Assuming a uniformly distributed source model, a 30 keV energy threshold, and a 3 delta detection threshold, it is estimated that the burst rate is 39,000 + 90,000 - 32,000/yr. It is found that the emission originated from the direction of Ursa Major. The event displays a marginal periodicity with a fundamental period 2.17 + or - 0.12 s.
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