J/AJ/126/2562       Second VLBA calibrator survey: VCS2      (Fomalont+, 2003)
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Beginning of ReadMe : J/AJ/126/2562 Second VLBA calibrator survey: VCS2 (Fomalont+, 2003) ================================================================================ The second VLBA calibrator survey: VCS2. Fomalont E.B., Petrov L., Macmillan D.S., Gordon D., Ma C. <Astron. J., 126, 2562-2566 (2003)> =2003AJ....126.2562F ================================================================================ ADC_Keywords: Radio sources ; Surveys ; Positional data Keywords: astrometry - catalogs - quasars: general - radio continuum - reference systems - techniques: interferometric Abstract: This paper presents an extension of the Very Long Baseline Array Calibrator Survey, called VCS2, containing 276 sources. This survey fills in regions of the sky that were not completely covered by the previous VCS1 calibrator survey. The VCS2 survey includes calibrator sources near the Galactic plane, -30deg<DE<-45deg, and VLA calibrators. The positions have been derived from astrometric analysis of the group delays measured at 2.3 and 8.4 GHz using the Goddard Space Flight Center CALC/SOLVE package. From the VLBA snapshot observations, images of the calibrators are available, and each source is given a quality code for anticipated use. The VCS2 catalog is available from the NRAO Web site. Description: The VCS2 observations were carried out in two 24hr sessions: 2002 January 31 and 2002 May 14. The observations used the VLBA dual-frequency geodetic mode, observing simultaneously at 2.3GHz (S band) and 8.4GHz (X band). The data for each of these two frequencies were separated into four 8MHz channels, which spanned 140MHz at 2.3GHz and 490MHz at 8.4GHz, in order to provide precise measurements of the group delays for astrometric processing.