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Hard X-ray bursts detected by the IBIS telescope onboard the INTEGRAL observatory in 2003 2004

Sunyaev, R. A.; Grebenev, S. A.; Chelovekov, I. V.

All of the observations performed with the IBIS telescope onboard the INTEGRAL observatory during the first one and a half years of its in-orbit operation (from February 10, 2003, through July 2, 2004) have been analyzed to find X-ray bursts. The time history of the IBIS/ISGRI total count rate in the energy range 15-25 keV revealed 1077 bursts of …

New nearby active galactic nuclei among INTEGRAL and RXTE X-ray sources

Bikmaev, I. F.; Sunyaev, R. A.; Revnivtsev, M. G. +1 more

We present the first results of a campaign to optically identify X-ray sources discovered in the all-sky surveys of the RXTE and INTEGRAL observatories. Six newly discovered sources proved to be hitherto unknown nearby active galactic nuclei (z < 0.1). Spectrophotometric studies of these sources were performed with the Russian-Turkish 1.5-m tel…

Multiple acceleration of protons on the Sun and their free propagation to the Earth on January 20, 2005

Struminsky, A. B.

We analyze the observations of solar protons with energies >80 MeV near the Earth and the January 20, 2005, solar flare in various ranges of the electromagnetic spectrum. Within approximately the first 30 min after their escape into interplanetary space, the solar protons with energies above 80 MeV propagated without scattering to the Earth and…

Constraints on the late X-ray radiation from the low-energy gamma-ray burst of December 3, 2003: INTEGRAL data

Sunyaev, R. A.; Sazonov, S. Yu.; Lutovinov, A. A. +1 more

Comparison of the INTEGRAL upper limits on the hard X-ray flux before and after the low-energy GRB 031203 with the XMM measurements of the dust-scattered radiation at lower energies suggests that a significant fraction of the total burst energy could be released in the form of soft X-ray radiation at an early afterglow stage with a characteristic …