Abstract
The relative response of the five segments of the HEAO 3 gamma-ray-spectroscope anticoincidence shield (a 6.62-cm-thick 33.1-cm-OD 27.4-cm-high CsI cylinder) is used to estimate the directions of gamma-ray bursts on February 13, 1980 and September 29, 1979. The operation of the instrument and the data-analysis procedures are described, and the results are presented graphically. The 1980 event is located in an error box centered on alpha = 104.5 deg and delta = -15 deg (error box A of Atteia et al., 1987). The position of the 1979 event (alpha = 75 deg and delta = 40 deg) is shown to be consistent with ISEE 3 and Pioneer Venus Orbiter arrival times.
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