Table of contents
- 1. C251B Correlation Report
- 1.1. General information
- 1.2. Status
- 1.3. Fringes
- 1.4. Notes
- 1.5. Post-Correlation checks
- 1.5.1. Residuals
- 1.5.2. FITS completeness (pclist)
C251B Correlation Report
General information
- Contains 3mm projects MP014B, POLCAL1, MH007 part1 (with ALMA)
- Session info: http://www3.mpifr-bonn.mpg.de/div/vlbi/globalmm/
- Session feedback: https://www3.mpifr-bonn.mpg.de/div/vlbi/globalmm/sessions/apr25/feedback_apr25.asc
- ANTAB and log files are available at
- Station feedback:
- ATCA scheduled but could not observe
- GBT is apparently late on source in many scans
- Mopra's KASI OCTAD away for repair, observed with 1 Gbps LBA system (4 channels = 2 IF x 2 pol x 64 MHz). Correlation: 3 out of 4 channels turned out good, but LCP IF#2 has strong RFI(?) and barely any fringes
- Mopra "the first 2 hours of c251b at 3mm went smoothly", then rain? The first 2h would be scans No0001 2025y115d15h00m00s to No0016 2025y115d16h49m30s. Only No0001 has any fringes.
Status
| what | date |
|---|---|
| Clock search for stations available so far | 22.05.2025, xx.09.2025 |
| Started full clock search and DiFX setup | 12.02.2026 |
| Loaded GLT modules, completed clock search and DiFX setup for all stations | 18.02.2026 |
| Production correlation v1 started, with a few pauses for mj008 c251z and geodesy | 18.02.2026 |
| Production correlation v1 finished | 22.02.2026 |
Fringes
| Station | Code | Fringes | Plots | Comments |
|---|---|---|---|---|
| ALMA-APEX-JCMT-VLBA | yes | No0099 | ||
| ALMA-NOEMA-GBT-EVN | yes | No0062 | ||
| GLT-NOEMA-ALMA-On | yes | No0065 | ||
| GLT-NOEMA-ALMA wideband | yes | No0065 wb | 8 additional IFs (16 x 64 MHz total) for the wideband stations | |
| NOEMA-KVN, KVN-KVN | yes | No0023 | ||
| Mopra | poor | No0001 | weak fringes and only at the start of track, and LCP IF#2 corrupted/RFI as in C251A | |
Notes
This track has three wideband stations (ALMA, NOEMA, GLT) hence in addition to the standard 8 GMVA IFs, correlation adds 8 additional IFs common to the ALMA-NOEMA-GLT triangle. The frequency coverage is illustrated below; wedges are recorded channels, colored vertical bars are DiFX correlation output IFs.
Comments