Calibrating using two different phase calibrators
Posted: Thu Apr 07, 2016 4:50 pm
We have a set of 4cm CABB observations covering many sources across the southern sky. The observer scheduled the observations such that each source has its own nearby phase calibrator, which is visited only once per cycle, before the source, and which is followed by a scan of another calibrator, nearby the next source. We're interested in only one source, which happens to be followed by 1934-638. Therefore, we can use 1934-638 for flux density and bandpass calibration.
As for phase calibration, we'd ideally interpolate between the bracketing scans using the two phase calibrators. Is this possible? Alternatively, we could possibly extrapolate from all ~2 mins of the scan of the phase calibrator before hand, although the sources are typically observed for ~8 mins, so the phases may significantly change. Presumably you could do this with gpaver.
As for phase calibration, we'd ideally interpolate between the bracketing scans using the two phase calibrators. Is this possible? Alternatively, we could possibly extrapolate from all ~2 mins of the scan of the phase calibrator before hand, although the sources are typically observed for ~8 mins, so the phases may significantly change. Presumably you could do this with gpaver.