; CALCODE ;--------------------------------------------------------------- ;! specifies the type of calibrator to be selected ;# ADVERB CALIBRATION ;----------------------------------------------------------------------- ;; Copyright (C) 1995, 2010 ;; Associated Universities, Inc. Washington DC, USA. ;; ;; This program is free software; you can redistribute it and/or ;; modify it under the terms of the GNU General Public License as ;; published by the Free Software Foundation; either version 2 of ;; the License, or (at your option) any later version. ;; ;; This program is distributed in the hope that it will be useful, ;; but WITHOUT ANY WARRANTY; without even the implied warranty of ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the ;; GNU General Public License for more details. ;; ;; You should have received a copy of the GNU General Public ;; License along with this program; if not, write to the Free ;; Software Foundation, Inc., 675 Massachusetts Ave, Cambridge, ;; MA 02139, USA. ;; ;; Correspondence concerning AIPS should be addressed as follows: ;; Internet email: aipsmail@nrao.edu. ;; Postal address: AIPS Project Office ;; National Radio Astronomy Observatory ;; 520 Edgemont Road ;; Charlottesville, VA 22903-2475 USA ;----------------------------------------------------------------------- CALCODE LLLLLLLLLLLLUUUUUUUUUUUU CCCCCCCCCCCCCCCCCCCCCCCCCCCCC ---------------------------------------------------------------- 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 O = calibrator for Complex Gain and Flux Density Scale P is reserved for pointing scans Q = calibrator for Complex Gain, Flux Density Scale and Bandpass R = calibrator for Complex Gain, Flux Density Scale, Bandpass and Polarization Angle 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 (a source recognition only) 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 J X X K X X L X X M X X N X X X O X X Q X X X R X X X X The VLBA has attached different meanings on occasion as well to some of the EVLA codes. ----------------------------------------------------------------