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

Mészáros, Attila and Bagoly, Zsolt and Horváth, István and Balázs, Lajos György and Vavrek, Roland (2000) A Remarkable Angular Distribution of the Intermediate Subclass of Gamma‐Ray Bursts. The Astrophysical Journal, 539 (1). pp. 98-101. ISSN 0004-637X

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Abstract

We develop a method of testing the null hypothesis of intrinsic randomness in the angular distribution of gamma-ray bursts collected in the Current BATSE Catalog. The method is a modified version of the well-known counts-in-cells test and fully eliminates the nonuniform sky-exposure function of the BATSE instrument. Applying this method to the case of all gamma-ray bursts, we found no intrinsic nonrandomness. The test also did not find intrinsic nonrandomness for the short and long gamma-ray bursts. However, using the method on the new, intermediate subclass of gamma-ray bursts, the null hypothesis of intrinsic randomness for 181 intermediate gamma-ray bursts is rejected on the 96.4% confidence level. Taking 92 dimmer bursts from this subclass, we obtain a surprising result: this "dim" subclass of the intermediate subclass has an intrinsic nonrandomness on the 99.3% confidence level. On the other hand, the 89 "bright" gamma-ray bursts show no intrinsic nonrandomness.

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