Bright flare of Cyg X-1 in hard X-ray band

Details Bright flare of Cyg X-1 in hard X-ray band Bright flare of Cyg X-1 in hard X-ray band

May 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008atel.1533....1n&link_type=abstract

The Astronomer's Telegram, #1533

Astronomy and Astrophysics

Astronomy

3

X-Ray, Gamma Ray, Request For Observations

Scientific paper

ESA's INTEGRAL/ISGRI instrument has detected a bright flare from the persistent black-hole binary Cyg X-1 during Key Program observations of the Cygnus region. During the first four days of the monitoring program the source flux was at a more or less constant level of about 1 Crab (20-80 keV). On top of this, INTEGRAL has detected a flare lasting about 8 hours and reaching a maximum of about 2 Crab in the 40-80 keV band in a pointing taken on April 18, 2008 between 15:02 and 15:36 UT.

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