Abstract
During more than 2 years of the GRANAT mission the gamma-ray burst (GRB) cell of the narrow aperture coded mask telescope SIGMA was operating for ∼5300 hr. The coding system of SIGMA is capable to localize with arcmin accuracy the GRB events detected through the 18:1 by 16:8 coded vield of view. The sensitivity of the cell to the on-axis events is very high, ∼3×10 −8 and 8×10 −8 ergs cm −2 in the 40-90 keV band for 0.25 and 2.0 s of integration time. Nevertheless, no bursts were actually found within the coded field of view
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