| VS03q Results
Submitted checklist.txt and checklist.tex is also available |
[Summary | AIPS | Difmap ] |
| Observation code | : | VS03q | AIPS Version | : | 15APR99 |
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| Date of Observation | : | 1998/218 | Difmap Version | : | 2.3c | |||
| Source Name | : | J0339-0146 | vsop_difmap used | : | No | |||
| Calibration Source(s) | : | 0420-014 | ||||||
| Ground telescopes | : | CEDUNA, SESHAN25 | Model Fitted to data | : | Yes | |||
| Tracking Station(s) | : | TZ, RZ, UZ | Image made | : | Yes | |||
| Correlator | : | Pentincton |
| Abstract
Only two GRTs were in the experiment. Ceduna performance was bad between ~21h-23h UT. The source was not detected on the longest space baselines (23h-01h UT). Imaging was possible with phase-only calibration (HALCA provided some data on short spacings!). The correlated flux density at 100 Mlambda was a bit less than in the VLBApls dataset. The relative amplitude calibration between the telescopes was OK. The calibrator source was not splitted as the data were not enough for checking the absolute amplitude calibration. The source was resolved; a single Gaussian component was fitted to the data. |
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| FITLD | douvcomp 1 |
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Data received on DAT tape from Leonid Gurvits (JIVE). |
| FIXWT | bif = 1 bchan = 100 detime = -1 |
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| INDXR | cparm = 0, 0, 0.25, 0 |
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Input scan break taken from PI letter. |
| TABED | bcount = 2 ecount = 3 keyval = 2 |
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Correct antenna type for HALCA (MNTSTA: orbiter->2) |
| ANTAB | tyver = 1 gcver = 1 |
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Gain curve information from VSOP calibration web page. Nominal Tsys used for Ceduna and HALCA. |
| APCAL |
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| CLCAL | opcode = 'cali' interpol = '2pt' |
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| TACOP |
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| CLCOR | timer 1 1 18 0 1 1 48 15 opcode 'sbdl' antennas 2 0 gainver 3 clcorprm -500, -500 |
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Fringes were not found in the 3rd tracking pass. Shift HALCA delays by 500 ns-- this way the delay window may be decreased in FRING. |
| FRING | docalib = 1 flagver = 1 refant = 1 search = 1,3 solint = 5 aparm = 2, 0, 0, 0, 2, 1, 4, 0, 1 dparm = 3, 400, 100, 0.7 |
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Ceduna was not good reference antenna. |
| FRING | docalib = 1 flagver = 1 refant = 3 search = 3,1 solint = 5 aparm = 2, 0, 0, 0, 2, 1, 4, 0, 1 dparm = 3, 400, 100, 0.7 |
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Reference antenna was Shanghai. |
| CLCAL | opcode = 'cali' interpol = 'ambg' refant 3 |
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| TACOP |
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| CLCOR | opcode = 'gain' antenn = 0 clcorprm = 0.906, 0 |
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Gain correction for Penticton data correlated before 14 Feb 1999. |
| SPLIT | aparm = 2, 0.7, 0, 1, 0 sources 'J0339-01' '' |
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The calibrator source was not splitted. |
| FITTP |
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Data written out for analysis in Difmap. |
AIPS Input Files
| ANTAB.TXT INDXR.TXT |
Comments - None - |
Additional Files
| Name | Description |
| processing.log | AIPS data reduction log file with detailed notes. |
AIPS Output Files
| Phase selfcal applied? | Yes |
| Global amplitude selfcal (gscal) applied? | No |
| Amplitude selfcal on non-global timescales used? | No |
| Modelfit made and saved? | Yes |
| Image Made and saved? | Yes |
| Comments on Difmap processing
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| Image | ||||
| Ampl, Phase vs (u,v) Distance PS (26 kb) JPEG (40 kb) |
Ampl, Phase vs Time PS (105 kb) JPEG 1, 2 |
(u,v) Coverage PS (13 kb) JPEG (25 kb) | Closure Phase vs Time PS (57 kb) JPEG 1 |
Clean Image PS (38 kb) JPEG (47 kb) |
| Modelfit | ||||
| Ampl, Phase vs (u,v) Distance PS (20 kb) JPEG (39 kb) |
Ampl, Phase vs Time PS (97 kb) JPEG 1, 2 |
(u,v) Coverage PS (13 kb) JPEG (25 kb) | Closure Phase vs Time PS (56 kb) JPEG 1 |
Image with model components PS (825 bytes) JPEG (0 bytes) |
More details on the Images and Modelfits are found in this page.
