A Simultaneous GBT/Fermi Study of Crab Giant Pulses

Details A Simultaneous GBT/Fermi Study of Crab Giant Pulses A Simultaneous GBT/Fermi Study of Crab Giant Pulses

May 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010aas...21642816k&link_type=abstract

American Astronomical Society, AAS Meeting #216, #428.16

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Scientific paper

We report on the last results from the correlation analysis of the Crab radio giant pulses (GPs) with Fermi photons. Radio observations were carried out with the 100-m Robert C. Byrd Green Bank Telescope at the frequency of 8.9 GHz for about of 10.5 h of contemporaneous time with Fermi Space Telescope. These observations are part of the ongoing campaign with two other telescopes, the 140-ft telescope at Green Bank Observatory (WV) and 42-ft telescope at Jodrell Bank Observatory (UK). No correlation found between photons and 2-min bursts of radio GPs up to a 40-min formally possible lag between them. Using the Bayesian approach we put a conservative limit on average gamma-ray flux increase during GPs to be less than 10 integral fluxes of the Crab pulsar. The lack of correlation, if genuine, implies that radio GPs are primarily caused by enhanced coherence rather than enhanced pair creation.

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