Prospects for GRB Observations With CTA from a Phenomenological Model

Details Prospects for GRB Observations With CTA from a Phenomenological Model Prospects for GRB Observations With CTA from a Phenomenological Model

Sep 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011head...12.1402w&link_type=abstract

American Astronomical Society, HEAD meeting #12, #14.02

Mathematics

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Scientific paper

Very high energy photons from GRBs, as high as 90 GeV in the rest frame energy, have been detected by the Fermi Large Area Telescope. This provides hope for a high statistics GRB detection by a ground-based instrument in the VHE domain. In this talk, we report on our recent estimation of the expected GRB detection rate for the Cherenkov Telescope Array (CTA). We investigate the dependence of this expected detection rate on critical design parameters of CTA (energy threshold, slewing time delay, field of view), and we consider as well the rate, time delay, and localization accuracy of triggers that will be provided by current and future satellite instruments such as Swift, SVOM, and Fermi GBM. Our predictions are based on a phenomenological model which uses temporal and spectral characteristics of GRBs detected by Fermi as well as other instruments operating at lower energy. While detection of VHE emission from GRBs has eluded ground-based instruments thus far, our results suggest ground-based detection should be within reach of CTA, albeit with a low rate. Even a limited number of such detections would nonetheless be an important step forward in our understanding of GRB physics, as well as probe the evolving optical-ultraviolet extragalactic background light at relatively high redshifts.

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