Add to ORKGA very high activity of Cygnus X-1 on 1999 April 19-21 was recorded by BATSE Large Area Detectors onboard the Compton Gamma-Ray Observatory. The peak luminosity was one order of magnitude higher than the normal luminosity of Cyg X-1. This fact can be critical for models of the hard state of Cyg X-1. The longest outburst lasted 1000 s and demonstrated very unusual temporal and spectral behavior which indicates the presence of two emission components. One component is relatively soft (with a cutoff below 100 keV) and highly variable, and the other one is hard (extending above 100 keV), with much slower variability
Continuing the observational campaign initiated by our group, we present the long term spectral evol...
We have analyzed approximately 1100 days of Cygnus X-1 hard X-ray data obtained with BATSE to study ...
Rapid variability in X-ray sources implies a compact object such as a white dwarf, neutron star or b...
Context. Cygnus X-1 (Cyg X-1) is a high mass X-ray binary system, known to be a black hole candidate...
Continuing the observational campaign initiated by our group, we present the long term spectral evol...
We report the results from our timing analysis of 15 RXTE observations of Cygnus X-1 throughout its ...
We present the results from the RXTE observations of Cygnus X-1 in its high state. In the energy ran...
We present the results of multi-year gamma-ray observations by the AGILE satellite of the black hole...
In previous work, we have used data from the first three years of the CGRO mission to assemble a bro...
Continuing the observational campaign initiated by our group, we present the long term spectral evo...
We report RXTE/PCA observations of the black hole candidate Cygnus X-1. In 1996 February the source ...
We report on the 0.5--200 keV spectral properties of Cyg X-1 observed at different epochs with the N...
We present four X-ray/gamma-ray spectra of Cyg X-1 observed in the hard ('low') state simultaneously...
Continuing the observational campaign initiated by our group, we present the long term spectral evol...
We have analyzed approximately 1100 days of Cygnus X-1 hard X-ray data obtained with BATSE to study ...
Rapid variability in X-ray sources implies a compact object such as a white dwarf, neutron star or b...
Context. Cygnus X-1 (Cyg X-1) is a high mass X-ray binary system, known to be a black hole candidate...
Continuing the observational campaign initiated by our group, we present the long term spectral evol...
We report the results from our timing analysis of 15 RXTE observations of Cygnus X-1 throughout its ...
We present the results from the RXTE observations of Cygnus X-1 in its high state. In the energy ran...
We present the results of multi-year gamma-ray observations by the AGILE satellite of the black hole...
In previous work, we have used data from the first three years of the CGRO mission to assemble a bro...
Continuing the observational campaign initiated by our group, we present the long term spectral evo...
We report RXTE/PCA observations of the black hole candidate Cygnus X-1. In 1996 February the source ...
We report on the 0.5--200 keV spectral properties of Cyg X-1 observed at different epochs with the N...
We present four X-ray/gamma-ray spectra of Cyg X-1 observed in the hard ('low') state simultaneously...
Continuing the observational campaign initiated by our group, we present the long term spectral evol...
We have analyzed approximately 1100 days of Cygnus X-1 hard X-ray data obtained with BATSE to study ...
Rapid variability in X-ray sources implies a compact object such as a white dwarf, neutron star or b...