Search Publications
The first observation of AX J1749.1-2733 in a bright X-ray state—Another fast transient revealed by INTEGRAL
Sunyaev, R. A.; Grebenev, S. A.
An intense outburst of hard radiation (with a peak flux of ∼50 mCrab) was detected from the X-ray transient AX J1749.1-2733 by the IBIS/ISGRI gamma-ray telescope onboard the INTEGRAL observatory when the Galactic center field was monitored on September 8 10, 2003. Previously, this source had never been observed in a bright X-ray state. During the …
4U 0115+63 from RXTE and INTEGRAL data: Pulse profile and cyclotron line energy
Sunyaev, R. A.; Tsygankov, S. S.; Lutovinov, A. A. +1 more
We analyze the observations of the transient X-ray pulsar 4U 0115+63 with the RXTE and INTEGRAL observatories in a wide X-ray (3-100 keV) energy band during its intense outbursts in 1999 and 2004. The energy of the fundamental harmonic of the cyclotron resonance absorption line near the maximum of the X-ray flux from the source (luminosity range 5…
Detection of the first thermonuclear X-ray burst from AX J1754.2-2754
Grebenev, S. A.; Chelovekov, I. V.
When analyzing the archival data of the INTEGRAL observatory, we detected an intense X-ray burst recorded on April 16, 2005, by the JEM-X and IBIS/ISGRI telescopes from the weak and poorly studied source AX J1754.2-2754. Analysis of its time profiles and spectra allows this event to be attributed to type I X-ray bursts associated with thermonuclea…
Study of the fast X-ray transient XTE J1901+014 based on INTEGRAL, RXTE, and ROSAT data
Lutovinov, A. A.; Karasev, D. I.; Grebenev, S. A.
The source XTE J1901+014 discovered by the RXTE observatory during an intense outburst of hard radiation and classified as a fast X-ray transient is studied. The source’s spectral characteristics in the quiescent state have been investigated for the first time both in the soft X-ray energy range (3 20 keV) based on ROSAT and RXTE data and in the h…
Cosmic GRB 060428C detected in the field of view of the IBIS and SPI telescopes onboard the INTEGRAL observatory and its early afterglow
Grebenev, S. A.; Chelovekov, I. V.
While analyzing the archival data of the INTEGRAL observatory, we detected and localized a cosmic gamma-ray burst recorded on April 28, 2006, by the IBIS/ISGRI and SPI telescopes in their fields of view. Since the burst was not revealed by the INTEGRAL burst alert system (IBAS), information about its coordinates was not distributed in time and no …
Development dynamics of intense solar proton flares
Zimovets, I. V.; Struminsky, A. B.
We consider the relationship of electromagnetic radiation in the three most intense flares of solar cycle 23, more specifically, those of October 28, 2003, January 20, 2005, and September 7, 2005, to the acceleration and release of protons into interplanetary space. The impulsive phase of these flares lasted ∼ 20 min and consisted of at least thre…
INTEGRAL observations of the gamma-ray burst on March 11, 2007
Sunyaev, R. A.; Sazonov, S. Yu.; Molkov, S. V.
On March 11, 2007, the INTEGRAL observation discovered and localized a gamma-ray burst in the sky from which an early infrared afterglow was then detected. We present our timing and spectral analyses of the data from the ISGRI detector of the IBIS telescope. The burst consists of one ∼40-s-long peak during which a fluence of ∼3 × 10-6 e…