BATSE Earth Occultation Observations of Cygnus X-1 in 1993

Details BATSE Earth Occultation Observations of Cygnus X-1 in 1993 BATSE Earth Occultation Observations of Cygnus X-1 in 1993

May 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994aas...184.6703l&link_type=abstract

American Astronomical Society, 184th AAS Meeting, #67.03; Bulletin of the American Astronomical Society, Vol. 26, p.971

Astronomy and Astrophysics

Astronomy

2

Scientific paper

We present preliminary results of approximately 250 days of BATSE Earth-occultation observation of the 20 keV to 1.8 MeV gamma-ray emission of Cygnus X-1 between April and December of 1993. Cygnus X-1 underwent several transitions in this period. The 45-140 keV flux first decreased from near the normal gamma_2 level to gamma_1 around the middle of May. The recovery to gamma_2 took nearly two months followed by a second transition to gamma_1 in early October. The flux then remained near the gamma_1 level until early December, before decreasing by nearly a factor of 2 by the end of December to the lowest level, which has only rarely been seen previously. Details of these flux changes and corresponding spectral changes will be presented. We will also report results of a search for episodes of emission above ~ 1 MeV, as have been reported by several previous investigators.

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