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We aim to search for evidence of annual modulation in the time scales of theBL Lac object S5 0716+714. The intra-day variability (IDV) observations werecarried out monthly from 2005 to 2009, with the Urumqi 25m radio telescope at4.8 GHz. The source has shown prominent IDV as well as long-term fluxvariations. The IDV time scale does show evidence in favor of an annualmodulation, suggesting that the IDV of 0716+714 is dominated by interstellarscintillation. The source underwent a strong outburst phase between mid-2008and mid-2009; a second intense flare was observed in late 2009, but nocorrelation between the total flux density and the IDV time scale is found,implying that the flaring state of the source does not have seriousimplications for the general characteristics of its intra-day variability.However, we find that the inner-jet position angle is changing throughout theyears, which could result in an annual modulation noise in the anisotropic ISSmodel fit. There is also an indication that the lowest IDV amplitudes (rms fluxdensity) correspond to the slowest time scales of IDV, which would beconsistent with an ISS origin of the IDV of 0716+714.

Intra-day variability observations of S5 0716+714 over 4.5 years at 4.8 GHz