VizieR Online Data Catalog: Radio astrometry of MAXI J1820+070 (Atri+, 2020)

We monitored MAXI-J1820 (see Table 1) with the Very Long Baseline Array (VLBA), using both the Jet Acceleration and Collimation Probe of Transient X-ray Binaries (JACPOT-XRB) programme, proposal code BM467), and a long-running astrometry programme (proposal code BA130), supplemented with a targeted European VLBI Network (EVN) campaign (proposal code EA062). All observations used a combination of J1821+0549 (J1821 hereon) and J1813+065 (J1813 hereon) as the phase reference and astrometric check sources. The calibrator positions were taken from the Radio Fundamental catalogue (rfc2015a1). Our assumed positions (J2000) were RA = 18:21:27.305837, Dec = 05:49:10.65156 for J1821, and RA = 18:13:33.411619, Dec = 06:15:42.03366 for MAXI J1813. We imaged the calibrated data and determined the target position by fitting a point source in the image plane for every epoch.

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