FERMI GBM Observes Increase in Hard X-rays from Cyg X-1

Details FERMI GBM Observes Increase in Hard X-rays from Cyg X-1 FERMI GBM Observes Increase in Hard X-rays from Cyg X-1

Dec 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011atel.3802....1c&link_type=abstract

The Astronomer's Telegram, #3802

Astronomy and Astrophysics

Astronomy

1

X-Ray, Gamma Ray, Black Hole

Scientific paper

Cyg X-1 has been in a soft state since MAXI saw a rapid brightening in the low energy x-rays on August 7 (ATel #3534). The transition to the soft state was verified by RXTE (ATel #3616) and FERMI/GBM (ATel #3636). Recently, FERMI/GBM observations using the Earth occultation technique showed an increase in the hard x-ray flux, beginning about November 25 (MJD 55890). The fluxes in the 12-25, 25-50, 50-100, and 100-300 keV bands, averaged over 25 days from MJD 55860-55885, have increased from 260 +/- 11, 183 +/- 16, 90 +/- 23, and 31 +/- 42 mCrab, respectively, to a 5-day average (MJD 55898-55902) of 671 +/- 20, 605 +/- 33, 492 +/- 47, and 395 +/- 89 mCrab, respectively.

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