Fermi GBM observes another decrease in hard x-rays from Cyg X-1
Abstract
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).
- Publication:
-
The Astronomer's Telegram
- Pub Date:
- January 2012
- Bibcode:
- 2012ATel.3880....1C
- Keywords:
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- X-ray;
- Gamma Ray;
- Binary;
- Black Hole