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- W3100910995 abstract "The sky distribution of gamma-ray bursts (GRBs) has been intensively studied by various groups for more than two decades. Most of these studies test the isotropy of GRBs based on their sky number density distribution. In this work, we propose an approach to test the isotropy of the universe through inspecting the isotropy of the properties of GRBs such as their duration, fluences, and peak fluxes at various energy bands and different timescales. We apply this method on the Fermi/Gamma-ray Burst Monitor (GBM) data sample containing 1591 GRBs. The most noticeable feature we found is near the Galactic coordinates , , and radius . The inferred probability for the occurrence of such an anisotropic signal (in a random isotropic sample) is derived to be less than a percent in some of the tests while the other tests give results consistent with isotropy. These are based on the comparison of the results from the real data with the randomly shuffled data samples. Considering the large number of statistics we used in this work (some of which are correlated with each other), we can anticipate that the detected feature could be a result of statistical fluctuations. Moreover, we noticed a considerably low number of GRBs in this particular patch, which might be due to some instrumentation or observational effects that can consequently affect our statistics through some systematics. Further investigation is highly desirable in order to clarify this result, e.g., utilizing a larger future Fermi/GBM data sample as well as data samples of other GRB missions and also looking for possible systematics." @default.
- W3100910995 created "2020-11-23" @default.
- W3100910995 creator A5053462873 @default.
- W3100910995 creator A5060492044 @default.
- W3100910995 date "2017-12-06" @default.
- W3100910995 modified "2023-10-13" @default.
- W3100910995 title "Testing the Isotropic Universe Using the Gamma-Ray Burst Data of<i>Fermi</i>/GBM" @default.
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- W3100910995 doi "https://doi.org/10.3847/1538-4357/aa9708" @default.
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