Highlights from Fermi Gamma-Ray Space Telescope observations of Gamma-Ray Bursts

Details Highlights from Fermi Gamma-Ray Space Telescope observations of Gamma-Ray Bursts Highlights from Fermi Gamma-Ray Space Telescope observations of Gamma-Ray Bursts

Feb 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010aps..apr.g3001g&link_type=abstract

American Physical Society, APS April Meeting 2010, February 13-16, 2010, abstract #G3.001

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The Fermi Gamma-Ray Space Telescope has more than doubled the number of Gamma-Ray Bursts (GRBs) detected at high energies (>100;MeV) within its first year of operation. Thanks to the very wide energy range covered by Fermi's Gamma-ray Burst Monitor (GBM; 8;keV to 40;MeV) and Large Area Telescope (LAT; 25;MeV to >300;GeV) it has measured the prompt GRB emission spectrum over an unprecedentedly large energy range (from ˜8;keV to ˜30;GeV). I will present highlights from Fermi GRB observations focusing mainly on the prompt emission phase. Interesting new observations will be discussed along with some of their possible implications, including: (i) What can we learn from the Fermi-LAT GRB detection rate, (ii) A limit on the variation of the speed of light with photon energy (for the first time beyond the Planck scale for a linear energy dependence from direct time of arrival measurements), (iii) Lower-limits on the bulk Lorentz factor of the GRB outflow (of ˜1000 for the brightest Fermi LAT GRBs), (iv) The detection (or in other cases, lack thereof) of a distinct spectral component at high (and sometimes also at low) energies, and possible implications for the prompt GRB emission mechanism, (v) The later onset (and longer duration) of the high-energy emission (>100;MeV) compared to the low-energy (< 1;MeV) emission that is seen in most Fermi-LAT GRBs. )

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