Up to 24 Feb 2012 Swift has triggered on 638 GRBs. In this work we use the pattern of the missing gamma, X-ray and optical data measured by BAT, XRT, UVOT and ground based measurements of the redshift, collected for the Swift GRBs (). Using the Boolean factor analysis of multivariate statistical methods we studied the missing data patterns of the gamma, X-ray and optical observed quantities of GRBs. We found that the measured gamma properties have some impact on the missing data in the X-ray and optical domains. The missing data pattern depends, however, on random effects as well.
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