  The study of nonstationary processes in the Sun is of great interest, and
lately, multiwavelength observations and registration of magnetic fields are
carried out by means of both ground-based telescopes and several specialized
spacecraft (SC) on near-Earth orbits. However the acquisition of the new
reliable information on their hard X-ray radiation remains demanded, in
particular if the corresponding SC provide additional information, e.g. in
regard to the flare observations from the directions other than the Sun-Earth
direction. In this article we present a catalog of powerful solar flares
registered by the High Energy Neutron Detector (HEND) device designed in the
Space Research Institute (IKI) of Russian Academy of Sciences. HEND is mounted
onboard the 2001 Mars Odyssey spacecraft. It worked successfully during the
flight to Mars and currently operates in the near-Mars orbit. Besides neutrons,
the HEND instrument is sensitive to the hard X-ray and gamma radiation. This
radiation is registered by two scintillators: the outer one is sensitive to the
photons above 40 keV and the inner one to the photons above 200 keV. The
catalog was created with the new procedure of the data calibration. For most
powerful 60 solar flares on the visible and on the far sides of the Sun (in
respect to a terrestrial observer), we provide time profiles of flare
radiation, summed over all the channels of X-ray and in some cases of gamma-ray
bands as well as the spectra and characteristics of their power law
approximation. We briefly discuss the results of the previous articles on the
study of the Sun with HEND instrument and the potential of the further use of
these data.
