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Global Characteristics Of Gamma-Ray Bursts Observed With Integral
KTH, School of Engineering Sciences (SCI), Physics.
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2009 (English)In: Baltic Astronomy, ISSN 1392-0049, Vol. 18, no 3-4, 279-283 p.Article in journal (Refereed) Published
Abstract [en]

The gamma-ray instruments on board INTEGRAL have detected and localized 62 gamma-ray bursts (GRBs) to date. The peak flux distribution of these bursts shows that INTEGRAL detects proportionally more weak GRBs than Swift because of its higher sensitivity in a smaller field of view. Spectral lags, i.e., the time delay in the arrival of low-energy gamma rays with respect to high-energy gamma rays, are measured for 31 of the GRBs. Two groups are identified in the spectral lag distribution of INTEGRAL GRBs, one with short lags < 0.75 s (between 25-50 keV and 50-300 keV) and one with long lags > 0.75 s. Most of the long-lag GRBs are inferred to have low redshifts because of their long spectral lags. They are mainly observed in the direction of the supergalactic plane and hence reflect the local large-scale structure of the Universe. This low-luminosity population appears to be distinct from typical cosmological GRBs.

Place, publisher, year, edition, pages
2009. Vol. 18, no 3-4, 279-283 p.
Keyword [en]
gamma rays: bursts
National Category
Astronomy, Astrophysics and Cosmology
URN: urn:nbn:se:kth:diva-32205ISI: 000276474400007ScopusID: 2-s2.0-77950550675OAI: diva2:410055

QC 20110411

Available from: 2011-04-12 Created: 2011-04-11 Last updated: 2014-10-01Bibliographically approved

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