High state of Mkn 421 in the hard X-rays
RXTE/ASM data revealed an increased activity in the 3-10 keV energy of the TeV gamma-ray loud blazar Mkn 421. Its intensity began to rise in the middle of April 2006, reached a maximum around mid May and decreased since then. Its intensity began to increase again around 10th of June, 2006. This second increase led to the triggering of a target-of- opportunity observation with INTEGRAL. The observation of this blazar by INTEGRAL started on June 14, 2006.