Evidence for the Galactic Origin of Gamma-Ray Bursts

Details Evidence for the Galactic Origin of Gamma-Ray Bursts Evidence for the Galactic Origin of Gamma-Ray Bursts

Apr 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997apj...479l..31b&link_type=abstract

Astrophysical Journal Letters v.479, p.L31

Astronomy and Astrophysics

Astronomy

18

Gamma Rays: Bursts

Scientific paper

We propose a new criterion to divide the classical gamma-ray bursts into two classes on the basis of their distribution in the duration-hardness plane. We study the two proposed classes separately, dividing them into subsets of different hardness-ratio ranges. The intensity distribution (log N vs. log S) and the corresponding space distribution of the subsets provide us with a different scenario for each of the two classes. For the first time, in both cases, clear indications for a Galactic origin of gamma-ray bursts have been found. Two possibilities are favored: (1) two kinds of Galactic gamma-ray bursts coming from the disk and from the halo, respectively, and (2) two kinds of gamma-ray bursts deriving from two distinct source populations located at different positions in the Galactic disk.

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