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SIGMA Observations of the Bursting Pulsar GRO J1744-28
J. Mejia, T. Villela, P. Goldoni +13
We present the results of the GRANAT/SIGMA hard X-/soft gamma-ray long-term monitoring of the Galactic Center (GC) region concerning the source GRO J1744-28, discovered on 1995 Dec…
Timing Spectroscopy of Quasi-Periodic Oscillations in the Low-Mass X-ray Neutron Star Binaries
Lev Titarchuk, Vladimir Osherovich, Sergey Kuznetsov
Precise simultaneous measurements of the frequencies of the two kiloHertz quasi-periodic oscillations (referred in the literature as upper and lower kHz QPOs) cast doubts on the va…
Two Distinct Modes In The Low (Hard) State Of Cyg X-1 And 1E1740-294
S. Kuznetsov, M. Gilfanov, E. Churazov +12
The entire dataset of the GRANAT/SIGMA observations of Cyg X-1 and 1E1740.7-294 in 1990-1994 was analyzed in order to search for correlations between primary observational characte…