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Cygnus X-3 radio observations

ATel #1828; Guy Pooley (Cavendish Lab, Cambridge UK)
on 5 Nov 2008; 15:07 UT
Distributed as an Instant Email Notice Request For Observations
Credential Certification: Guy Pooley (ggp1@cam.ac.uk)

Subjects: Radio, X-ray, Gamma Ray, Request for Observations, Binary

Referred to by ATel #: 1830, 1838, 1839

Tavani et al (Atel #1827) report the detection of gamma-ray emission by AGILE, and they suggest that this is likely to be associated with the X-ray binary Cygnus X-3. Radio monitoring at 15 GHz with the AMI Large Array (the reconfigured and reengineered Ryle Telescope, Cambridge UK) shows a peak flux density of 420 mJy on 2008 October 29, falling to a level of 2 to 3 mJy on 2008 November 4 & 5. Such low ('quenched') flux densities are often observed before a major radio flare. The quenched regime may sometimes last for tens of days. A plot of recent flux densities is available at http://www.mrao.cam.ac.uk/~guy/cx3/cx3-08.ps