V1357 Cygni

B. A. Harmon, G. J. Fishman, B. C. Rubin, and C. A. Wilson, Marshall Space Flight Center, NASA; and W. S. Paciesas, University of Alabama at Huntsville, report for the Compton Observatory BATSE Team: "Hard x-ray emission from the black-hole candidate V1357 Cyg (Cygnus X-1), measured using the earth-occultation method, decreased gradually in the band 45-140 keV from a flux level of 0.12 to about 0.05 photon cmE-2 sE-1 between early September and Oct. 10, and remained at a low flux level as of Oct. 17. The two flux levels correspond roughly to the gamma2 (higher flux) and gamma1 (lower flux) states observed in 1979-1980 by HEAO-3 (Ling et al. 1987, Ap.J. 321, L117). The September-October light curve is similar to that observed in May-June (IAUC 5813)."