Fermi GBM Observes Decrease in Hard X-rays from Cyg X-1

Details Fermi GBM Observes Decrease in Hard X-rays from Cyg X-1 Fermi GBM Observes Decrease in Hard X-rays from Cyg X-1

Sep 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011atel.3636....1c&link_type=abstract

The Astronomer's Telegram, #3636

Astronomy and Astrophysics

Astronomy

2

X-Ray, Gamma Ray, Binary, Black Hole

Scientific paper

Recent x-ray observations of Cyg X-1 by MAXI (ATel #3534) and RXTE (ATel #3616) have indicated that this source has again made the transition to the soft state. The GBM instrument on Fermi is being used to monitor the hard x-ray/low energy gamma-ray sky in the 8-500 keV energy range using the Earth occultation technique. We report that Cyg X-1 has been decreasing in hard x-rays, coincident with the rise in soft x-rays seen by MAXI and RXTE.

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