Key to Calcodes
_calcodes_ are generated based on observing intents established during the SB creation. These intents are then passed along to the SDM data set. _Note: These will eventually be replaced by scan intents. These are also summarized currently in AIPS by typing:_
Help on CALCODE in AIPS version 31DEC10 CALCODE Type: Adverb (String*4) Use: This string is used to specify a desired calibration source code. ' ' => any calibrator code selected '* ' => any non blank code (calibrators only) '-CAL' => blank codes only (no calibrators) Null value: none The VLA has attached meaning to letters as follows: None = target source, or no potential calcode specified Old style VLA (indicators of positional accuracy): A = positional accuracy <0.002 arcseconds B = positional accuracy 0.002 - 0.01 arcseconds C = positional accuracy 0.01 - 0.15 arcseconds T = positional accuracy >0.15 arcseconds New style EVLA (indicators of scan intents): D = calibrator useful to determine Complex Gains E = calibrator useful to determine the absolute Flux Density Scale; typically only used for 3C48, 3C147, 3C286 (and 3C138, 3C295) F = calibrator useful to determine the spectral Bandpass response G = calibrator useful to determine Polarization Angle H = calibrator useful to determine the instrumental Polarization Leakage I = calibrator for Complex Gain and Bandpass J = calibrator for Complex Gain and Polarization Leakage K = calibrator for Flux Density Scale and Bandpass L = calibrator for Flux Density Scale and Polarization Angle M = calibrator for Bandpass and Polarization Angle N = calibrator for Flux Density Scale, Bandpass and Polarization Angle P = calibrator for Pointing observations Y = recognised as calibrator source in the VLA catalog by the pipeline; only appears when no other calcodes are present and NOT an indication that this calibrator is useful at this frequency or in this array Z = any other non-Target combination of intents Occasional VLBA: V = recognised as VLBI source in the VLBI "sched" catalog Code Gain Flux BP Pang P% D X E X F X G X H X I X X AIPS 1: ** press RETURN for more, enter Q or next line to quit print ** # autarch AIPS (31DEC10) 2492 06-MAY-2010 14:50:41 Page 2 Help on CALCODE in AIPS version 31DEC10 J X X K X X L X X M X X N X X X The VLBA has attached different meanings on occasion as well to some of the EVLA codes.