Hard X-ray observations of X-ray Nova Ophiuchi 1993 (GRS 1716-249) with GRANAT/SIGMA.

Details Hard X-ray observations of X-ray Nova Ophiuchi 1993 (GRS 1716-249) with GRANAT/SIGMA. Hard X-ray observations of X-ray Nova Ophiuchi 1993 (GRS 1716-249) with GRANAT/SIGMA.

Feb 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996rftu.proc..185r&link_type=abstract

International Conference on X-ray Astronomy and Astrophysics: Röntgenstrahlung from the Universe, p. 185 - 186

Astronomy and Astrophysics

Astrophysics

1

X-Ray Novae: X-Ray Binaries, X-Ray Novae: X-Ray Spectra, X-Ray Novae: Gamma Rays

Scientific paper

The results of observations of X-ray Nova Ophiuchi 1993 (GRS 1716-249) in hard X-ray/low γ-ray energy domain with the SIGMA telescope aboard the GRANAT observatory are reported. The hard X-ray emission from the source has been observed by SIGMA during a bright flare in 1993 and one year later - during the reappearance of the source in 1994. Combining the SIGMA data with results of quasi contemporaneous TTM (MIR-KVANT) observations the spectral behavior of the source is studied in the 2-400 keV energy band. Both in 1993 and 1994 the broad-band spectrum of GRS 1716-249 was quite similar to the low (hard) state spectrum of Cyg X-1, although subtle spectral variations, possibly correlated with the luminosity, were clearly detected.

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