UVFXT (to fix timestamps on GMRT uv data files within AIPS) =========================================================== To correct GMRT visibilites with timestamps near the beginning of the integration period, instead of middle. For example, for 16.9 s integrations, move timestamps on all uv data points forward by 7.4 s, (i.e. to centre of 16.9 s from the centre of the initial 2.1 s integration), and rotate u,v,w coordinates forward. Files: UVFXT.FOR <- source code (adapted from AIPS template, FUDGE.FOR) UVFXT.HLP <- help text To compile (as per Section 12.5.2 of the AIPS Cookbook): source /opt/aips/LOGIN.CSH <- to setup AIPS etc (or whatever, in your setup) $CDTST <- to setup logicals LIBS $APLPGM > UVFXT.OPT <- to create linking options file COMLNK UVFXT UVFXT.OPT <- to compile and link To use: setenv MYAIPS `pwd` <- in directory where compiled and then within AIPS say VERSION 'MYAIPS' to make UVFXT available. APARM(1) is the time (in s) to move the data forward by, and APARM(2) is the number of points to print out old/new U,V,W values, for diagnostics. This has been used successfully on single source UV files (but has not been tried for multi-source UV files). ----------------------------------- If you make use of this task, please cite: Garn et al. 2007, MNRAS, 376, 1251. where this task is briefly described. ----------------------------------- Dave Green (dag9@cam.ac.uk) -- MRAO -- 2007 April 11th