Mathematics – Logic
Scientific paper
Sep 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011head...12.0505g&link_type=abstract
American Astronomical Society, HEAD meeting #12, #5.05
Mathematics
Logic
Scientific paper
This is an overview of what we hope to learn from GRB observations with CTA. While GRBs have not yet been clearly detected at TeV energies, Fermi has already detected emission above 30 GeV in two GRBs (one short duration GRB and one long duration GRB), corresponding to energies of up to 94 GeV when correcting for the GRB's cosmological redshift. The much larger effective area of CTA at such energies promises good detection prospects from tens of GeV up to TeV energies. Such very high energy CTA GRB observations, together with complementary observations by other space missions (like Fermi) could greatly improve our understanding of the prompt GRB emission mechanism (e.g. help distinguish between leptonic and hadronic models), and provide important information about the particle acceleration in these sources, as well as valuable constraints on pair opacity within the source, which teach us about the outflow Lorentz factor and emission radius. Detection of TeV emission associated with X-ray flares would shed light on their emission mechanism and radius, thus probing their origin and underlying physics. Afterglow TeV emission could provide valuable new constraints on particle acceleration at relativistic collisionless shocks. In addition to teaching us about GRB physics, CTA GRB observations could also teach us about the extragalactic background light (through its absorption of high energy GRB photons on the way from the source to us) as well as provide sensitive tests of Lorentz invariance.
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