A Remarkable Angular Distribution of the Intermediate Subclass of Gamma‐Ray Bursts

In the article a test is developed, which allows to test the null-hypothesisof the intrinsic randomness in the angular distribution of gamma-ray burstscollected at the Current BATSE Catalog. The method is a modified version of thewell-known counts-in-cells test, and fully eliminates the non-uniformsky-exposure function of BATSE instrument. Applying this method to the case ofall gamma-ray bursts no intrinsic non-randomness is found. The test also didnot find intrinsic non-randomnesses for the short and long gamma-ray bursts,respectively. On the other hand, using the method to the new intermediatesubclass of gamma-ray bursts, the null-hypothesis of the intrinsic randomnessfor 181 intermediate gamma-ray bursts is rejected on the 96.4% confidencelevel. Taking 92 dimmer bursts from this subclass itself, we obtain thesurprising result: This "dim" subclass of the intermediate subclass has anintrinsic non-randomness on the 99.3% confidence level. On the other hand, the89 "bright" bursts show no intrinsic non-randomness.Comment: 14 pages, 2 figures, Accepted for publication in Astrophysical Journal, typo change