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Localization of Gamma-Ray Bursts Using the Fermi Gamma-Ray Burst Monitor
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2015 (English)In: The Astrophysical Journal Supplement Series, Vol. 216, no 2Article in journal (Refereed) PublishedText
Abstract [en]

The Fermi Gamma-ray Burst Monitor (GBM) has detected over 1400 gamma-ray bursts (GRBs) since it began science operations in 2008 July. We use a subset of over 300 GRBs localized by instruments such as Swift, the Fermi Large Area Telescope, INTEGRAL, and MAXI, or through triangulations from the InterPlanetary Network, to analyze the accuracy of GBM GRB localizations. We find that the reported statistical uncertainties on GBM localizations, which can be as small as 1°, underestimate the distance of the GBM positions to the true GRB locations and we attribute this to systematic uncertainties. The distribution of systematic uncertainties is well represented (68% confidence level) by a 3.°7 Gaussian with a non-Gaussian tail that contains about 10% of GBM-detected GRBs and extends to approximately 14°. A more complex model suggests that there is a dependence of the systematic uncertainty on the position of the GRB in spacecraft coordinates, with GRBs in the quadrants on the Y axis better localized than those on the X axis.

Place, publisher, year, edition, pages
2015. Vol. 216, no 2
Keyword [en]
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Astronomy, Astrophysics and Cosmology
URN: urn:nbn:se:kth:diva-184444DOI: 10.1088/0067-0049/216/2/32ISI: 000350899000011ScopusID: 2-s2.0-84923384641OAI: diva2:916031

QC 20160408

Available from: 2016-03-31 Created: 2016-03-31 Last updated: 2016-04-08Bibliographically approved

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Burgess, J. Michael
Astronomy, Astrophysics and Cosmology

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