Fermi GBM detects a rapid hard X-ray decline in Cyg X-1

Details Fermi GBM detects a rapid hard X-ray decline in Cyg X-1 Fermi GBM detects a rapid hard X-ray decline in Cyg X-1

Jul 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010atel.2721....1w&link_type=abstract

The Astronomer's Telegram, #2721

Astronomy and Astrophysics

Astronomy

5

X-Ray, Gamma Ray, Binaries, Black Holes

Scientific paper

Recent GBM data show gradual spectral softening of the black hole candidate Cyg X-1 since 8 June 2010, consistent with the recent measurements by MAXI/GSC at soft x-ray energies (Atel #2711). Five day average 50-100 keV and 100-300 keV fluxes have decreased from 1040+/-50 and 920+/-100 mCrab, respectively, for 8-12 June 2010 to 760+/-40 and 470+/-80 mCrab, respectively, for 29 June - 1 July 2010. At the same time, the lower energy flux has increased, from 390+/-50 to 620+/-50 mCrab in the 8-12 keV band and 510+/-20 to 642+/-20 mCrab in the 12-25 keV band.

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