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In 2009, Cygnus X-3 (Cyg X-3) became the first microquasar to be detected inthe GeV {\gamma}-ray regime, via the satellites Fermi and AGILE. The additionof this new band to the observational toolbox holds promise for building a moredetailed understanding of the relativistic jets of this and other systems. Wepresent a rich dataset of radio, hard and soft X-ray, and {\gamma}-rayobservations of Cyg X-3 made during a flaring episode in 2010 May. We detect a~3-d softening and recovery of the X-ray emission, followed almost immediatelyby a ~1-Jy radio flare at 15 GHz, followed by a 4.3{\sigma} {\gamma}-ray flare(E > 100 MeV) ~1.5 d later. The radio sampling is sparse, but we use archivaldata to argue that it is unlikely the {\gamma}-ray flare was followed by anysignificant unobserved radio flares. In this case, the sequencing of theobserved events is difficult to explain in a model in which the {\gamma}-rayemission is due to inverse Compton scattering of the companion star's radiationfield. Our observations suggest that other mechanisms may also be responsiblefor {\gamma}-ray emission from Cyg X-3.

The 2010 May Flaring Episode of Cygnus X-3 in Radio, X-Rays, and {\gamma}-Rays