Bright flare of Cyg X-1 in hard X-ray band
Abstract
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.
- Publication:
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The Astronomer's Telegram
- Pub Date:
- May 2008
- Bibcode:
- 2008ATel.1533....1N
- Keywords:
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- X-ray;
- Gamma Ray;
- Request for Observations