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We present the results of the search for a correlation between giant radiopulses (GRPs) at 1.4 GHz and hard X-rays at 15-75 keV from the Crab pulsar. Wemade simultaneous ground and satellite observations of the Crab pulsar over 12hours in three occasions in April 2010, March and September 2011, and got asample of 1.3*10^4 main-pulse phase GRPs. From these samples we have foundstatistically marginal enhancement (21.5%, 2.70 sigma) of hard X-ray fluxwithin +/- 1.5 degree phase angle of the synchronous peak of main-pulse phaseGRPs. This enhancement, if confirmed, implicates that GRPs may accompany plasmadensity increases in the pulsar magnetosphere.

Search for a correlation between giant radio pulses and hard X-ray emissions in the Crab pulsar