Fermi GBM observes another decrease in hard x-rays from Cyg X-1

Details Fermi GBM observes another decrease in hard x-rays from Cyg X-1 Fermi GBM observes another decrease in hard x-rays from Cyg X-1

Jan 2012

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2012atel.3880....1c&link_type=abstract

The Astronomer's Telegram, #3880

Astronomy and Astrophysics

Astronomy

X-Ray, Gamma Ray, Binary, Black Hole

Scientific paper

Cygnus X-1 has been quite active over the last ~2 years, undergoing two hard-to-soft state transitions. The GBM Earth Occultation Team has been using GBM to monitor Cyg X-1 in hard x-ray and low energy gamma-ray energies (8-1000 keV) during this time. After the most recent soft state transition (ATel #3534, #3616, #3636), GBM observed the Cyg X-1 hard x-ray fluxes to begin recover to the hard state beginning MJD 55890 (ATel #3802).

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