FERMI OBSERVATIONS OF HIGH-ENERGY GAMMA-RAY EMISSION FROM GRB 090217A
2010 (English)In: ASTROPHYS J LETT, ISSN 2041-8205, Vol. 717, no 2, L127-L132 p.Article in journal (Refereed) Published
The Fermi observatory is advancing our knowledge of gamma-ray bursts (GRBs) through pioneering observations at high energies, covering more than seven decades in energy with the two on-board detectors, the Large Area Telescope (LAT) and the Gamma-ray Burst Monitor (GBM). Here, we report on the observation of the long GRB 090217A which triggered the GBM and has been detected by the LAT with a significance greater than 9 sigma. We present the GBM and LAT observations and on-ground analyses, including the time-resolved spectra and the study of the temporal profile from 8 keV up to similar to 1 GeV. All spectra are well reproduced by a Band model. We compare these observations to the first two LAT-detected, long bursts GRB 080825C and GRB 080916C. These bursts were found to have time-dependent spectra and exhibited a delayed onset of the high-energy emission, which are not observed in the case of GRB 090217A. We discuss some theoretical implications for the high-energy emission of GRBs.
Place, publisher, year, edition, pages
2010. Vol. 717, no 2, L127-L132 p.
gamma-ray burst: individual (GRB090217A)
Astronomy, Astrophysics and Cosmology
IdentifiersURN: urn:nbn:se:kth:diva-27249DOI: 10.1088/2041-8205/717/2/L127ISI: 000279430700011ScopusID: 2-s2.0-77954013067OAI: oai:DiVA.org:kth-27249DiVA: diva2:381864
QC 201012292010-12-292010-12-092016-04-21Bibliographically approved