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We observed the BL Lac object 0716+714 at 22 and 43 GHz simultaneously to investigate its radio flux variability. This radio source is well known as an intraday variable (IDV) source which is characterized by rapid flux variations on time scale of a day or less. The observations were performed over three seasons with Korean VLBI Network (KVN) radio telescopes by using singledish observation mode. The first season consists of four epochs between J.D.=2455177 and J.D.=2455364 and each epoch was performed for 24 hours over 3-8 days to search for IDV of 0716+714. But significant fast variations such as IDV was not detected at both frequencies in the first season and only monotonic increases and decreases of flux are detected. In the second and third season, we obtained data a three or four-day interval from J.D.=2455511 to J.D.=2455747, and from J.D.=2455871 to J.D.=2456055 to search for longer term variability of 0716+714. Here, we present results obtained from multi-frequency observations of 0716+714 over three seasons.

Simultaneous multi-frequency flux monitoring of 0716+714 with KVN 21-m radio telescopes