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Anomalies of the cosmic microwave background (CMB) maps have been widelyacquainted nowadays from the Wilkinson Microwave Anisotropy Probe (WMAP)satellite to the Planck satellite. One of the anomalies is a multipolealignment from $l=2$ to $l=5$. In our work, we investigate the angulardistribution of gamma-ray bursts (GRBs) to find whether there is the sameanomaly of GRB as CMB. We perform spherical harmonics expansion on GRB samplesto derive coefficients of a few first terms of the expansion terms and findthat there is rough multipole alignment from $l=2$ to $l=4$ while the dipoleand $l=5$ multipole is in a distant direction, and that the quadrupole isobviously planar and the other ones are normal.

The signature of an anisotropic distribution of gamma-ray bursts