Fermi LAT detection of increasing gamma-ray activity from the microquasar Cygnus X-3

Details Fermi LAT detection of increasing gamma-ray activity from the microquasar Cygnus X-3 Fermi LAT detection of increasing gamma-ray activity from the microquasar Cygnus X-3

May 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010atel.2646....1c&link_type=abstract

The Astronomer's Telegram, #2646

Astronomy and Astrophysics

Astronomy

4

Gamma Ray, >Gev, Request For Observations, Black Holes, Neutron Stars, Transients

Scientific paper

Cygnus X-3 has recently been undergoing a transition from the hard state to the soft state. Whereas the transition already started late April (ATel #2609), the transition is still ongoing as indicated by the almost continuous decrease of hard X-ray emission of Cyg X-3 from Swift/BAT lightcurve or INTEGRAL analysis (ATel #2644, see also ATel #2635). The Large Area Telescope (LAT), one of the two instruments on the Fermi Gamma-ray Space Telescope, has observed an increasing gamma-ray flux from a source consistent with Cygnus X-3.

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