From gtaylor@cv3.cv.nrao.edu Mon Mar 5 10:14:39 2001 Date: Sun, 4 Mar 2001 09:51:58 -0700 (MST) From: gtaylor To: gtaylor Cc: Steven T. Myers , AIPS++ Core Testing Group , dshepher@zia.aoc.NRAO.EDU, Frazer Owen , efomalon@cv3.cv.nrao.edu, gmoellen@zia.aoc.NRAO.EDU, gtaylor@zia.aoc.NRAO.EDU, gvanmoor@zia.aoc.NRAO.EDU, jbenson@zia.aoc.NRAO.EDU, jhibbard@cv3.cv.nrao.edu, julvesta@zia.aoc.NRAO.EDU, tcornwel@zia.aoc.NRAO.EDU Subject: aips++ testing log of Feb 28-Mar 2 Testing AIPS++ Detailed Log Feb 28-Mar 2, 2001, session: note: TTT = trouble BBB = bug QQQ = question Flux calibration first real attempt: Set the flux density scale using reference calibrators Flux density for 0319+415 (spw=1) is: 33.733 +/- 1.297 Jy Flux density for 0319+415 (spw=2) is: 23.649 +/- 0.129 Jy Flux density for 0521+166 (spw=1) is: 1.579 +/- 0.059 Jy Flux density for 0521+166 (spw=2) is: 1.081 +/- 0.006 Jy Flux density for 0713+438 (spw=1) is: 2.797 +/- 0.095 Jy Flux density for 0713+438 (spw=2) is: 2.054 +/- 0.007 Jy Must be some bad data. Now trying to edit away some bad data. TVFLG function in visplot (show vis as image) seems to find no data regardless of selection criteria. Went to the NAUG meeting and found out (among other things) that the antenna numbers I was specifying weren't what I thought they were. After the meeting Debra showed me some features in the new msplot. Unfortunately it wouldn't actually allow any edits. Found Tim and he patched it up. We succeeded in flagging 'antenna 2'. BBB: Bug AOCso02338 Most VLA users spot bad data by plotting a 3 point (or more) rms of amplitude in TVLFG. It is essential to have this capability in the msplot "display data as an image" option. finally punted antenna id2 and id17. And used id27=antenna 6 as reference but the results are still wrong: Flux density for 0319+415 (spw=1) is: 35.562 +/- 1.467 Jy Flux density for 0319+415 (spw=2) is: 23.649 +/- 0.129 Jy Flux density for 0521+166 (spw=1) is: 14.082 +/- 0.566 Jy Flux density for 0521+166 (spw=2) is: 8.905 +/- 0.048 Jy Flux density for 0713+438 (spw=1) is: 2.901 +/- 0.106 Jy Flux density for 0713+438 (spw=2) is: 2.054 +/- 0.007 Jy Tried to apply this calibration anyway, but it crashes: BBB: Bug AOCso02342 While trying to apply a calibration table just determined, calibrater crashes and gives the following message: "Server 'calibrater' has failed unexpectedly! You will need to create the relevant tool again. If that causes unexpected behavior, please restart AIPS++ Please submit a bug-report using bug() if you can reproduce the problem. LocalExec::SetStatus: abnormal child termination for /home/cluster/aips++/weekly/linux_gnu/bin/calibrater" I repeated this twice with identical behaviour. George told me that he encountered the same problem in weekly, so I have to use stable to apply calibration. But the editing has to be done in weekly so some version hopping is necessary at the moment. Applied the calibration and noticed several interesting things about the calibration tables. (1) Some solutions in 'plotcal' are plotted where there are no data. Turns out that the reference antenna has its times misinterpreted. George is working on a fix. (2) If one IF the gains on 3C286 appear systematically depressed. This must be related to the miscalculated flux densities. George is looking into the causes for 3C286's severe depression. --- end of testing. Frustration meter reads: |************** | low high