Acknowledgement
We are grateful to the staff of the KVN who helped to operate the array and to correlate the data. The KVN and a high-performance computing cluster are facilities operated by the KASI (Korea Astronomy and Space Science Institute). The KVN observations and correlations are supported through the high-speed network connections among the KVN sites provided by the KREONET (Korea Research Environment Open NET-work), which is managed and operated by the KISTI (Korea Institute of Science and Technology Information). This work was supported by the National Research Foundation of Korea (NRF) grant funded by the Korea government (MIST) (2020R1A2C2009003). This research made use of Astropy (Astropy Collaboration et al., 2013, 2018), emcee (Foreman-Mackey et al., 2013), Matplotlib (Hunter, 2007), NumPy (Harris et al., 2020), and SciPy (Virtanen et al., 2020).
References
- Astropy Collaboration, Robitaille, T. P., Tollerud, E. J., et al., 2013, Astropy: A community Python package for astronomy, A&A, 558, A33 https://doi.org/10.1051/0004-6361/201322068
- Astropy Collaboration, Price-Whelan, A. M., Sipocz, B. M., et al., 2018, The Astropy Project: Building an Open-science Project and Status of the v2.0 Core Package, AJ, 156, 123 https://doi.org/10.3847/1538-3881/aabc4f
- Bennett, C. L., Larson, D., Weiland, J. L., et al., 2013, Nine-year Wilkinson Microwave Anisotropy Probe (WMAP) Observations: Final Maps and Results, ApJS, 208, 20 https://doi.org/10.1088/0067-0049/208/2/20
- Cornwell, T. & Fomalont, E. B., 1999, Self-Calibration, Synthesis Imaging in Radio Astronomy II, 180, 187
- Folkner, W. M., Williams, J. G., Boggs, D. H., et al., 2014, The Planetary and Lunar Ephemerides DE430 and DE431, Interplanetary Network Progress Report, 42-196, 1
- Foreman-Mackey, D., Hogg, D. W., Lang, D., et al., 2013, emcee: The MCMC Hammer, PASP, 125, 306 https://doi.org/10.1086/670067
- Gildas Team, 2013, GILDAS: Grenoble Image and Line Data Analysis Software, Astrophysics Source Code Library, ascl:1305.010
- Harris, C. R., Millman, K. J., van der Walt, S. J., et al., 2020, Array Programming with NumPy, Natur, 585, 357 https://doi.org/10.1038/s41586-020-2649-2
- Hunter, J. D., 2007, Matplotlib: A 2D Graphics Environment, Computing in Science and Engineering, 9, 90 https://doi.org/10.1109/MCSE.2007.55
- Kim, S. -H., Lee, S. -S., Lee, J. W., et al., 2022, Magnetic Field Strengths of the Synchrotron Self-Absorption Region in the Jet of CTA 102 during Radio Flares, MNRAS, 510, 815
- Lee, J. A., Sohn, B. W., Jung, T., et al., 2017, Korean VLBI Network Calibrator Survey (KVNCS). 1. Source Catalog of KVN Single-dish Flux Density Measurement in the K and Q Bands, ApJS, 228, 22 https://doi.org/10.3847/1538-4365/228/2/22
- Lee, S. -S., Byun, D. -Y., Oh, C. S., et al., 2011, Single-Dish Performance of KVN 21 m Radio Telescopes: Simultaneous Observations at 22 and 43 GHz, PASP, 123, 1398 https://doi.org/10.1086/663326
- Lee, S. -S., Han, M., Kang, S., et al., 2013, Monitoring of Multi-Frequency Polarization of Gamma-ray Bright AGNs, EPJWC, 61, 07007
- Lee, S. -S., Wajima, K., Algaba, J. -C., et al., 2016, Interferometric Monitoring of Gamma-Ray Bright AGNs. I. The Results of Single-epoch Multifrequency Observations, ApJS, 227, 8 https://doi.org/10.3847/0067-0049/227/1/8
- Shepherd, M. C., 1997, Difmap: an Interactive Program for Synthesis Imaging, Astronomical Data Analysis Software and Systems VI, 125, 77
- Urquhart, J. S., Hoare, M. G., Purcell, C. R., et al., 2010, Characterisation of the Mopra Radio Telescope at 16-50GHz, PASA, 27, 321 https://doi.org/10.1071/AS10002
- Virtanen, P., Gommers, R., Oliphant, T. E., et al., 2020, SciPy 1.0: fFndamental Algorithms for Scientific Computing in Python, NatMe, 17, 261
- Weiland, J. L., Odegard, N., Hill, R. S., et al., 2011, Seven-year Wilkinson Microwave Anisotropy Probe (WMAP) Observations: Planets and Celestial Calibration Sources, ApJS, 192, 19 https://doi.org/10.1088/0067-0049/192/2/19