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Aims. We analyze and characterize the angular distribution of selectedsamples of gamma ray bursts (GRBs) from Batse and Swift data to confirm thatthe division in two classes of short- and long-duration GRBs correspond also tothe existence of two distinct spatial populations. Methods. The angulardistribution is analyzed by using multifractal analysis and characterized by amultifractal spectrum of dimensions. Different spectra of dimensions indicatedifferent angular distributions. Results. The spectra of dimensions of shortand long bursts indicate that the two populations have two different angulardistributions. Both Swift and BATSE long bursts appear to be homo- geneouslydistributed in the sky with a monofractal distribution. Short GRBs followinstead a multifractal distribution for both the two samples. Even if BATSEdata may not give a secure in- terpretation of their angular distributionbecause of the instrumental selection effects that mainly favor the detectionof near GRBs, the results from Swift short GRBs confirm this behavior, alsowhen are included GRBs corrected by the redshift factor. The distributionstraced by short GRBs, up to z = 1, depict a universe with a structure similarto that of a disordered porous material with uniformly distributedheterogeneous irregular structures, appearing more clustered than whatexpected.

z=1 Multifractality of Swift short GRBs?