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Diego Alvarez-Ortega <dalvarez@physics.uoc.gr> </td>
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Awaiting Agent
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Redhat 7-64bit
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Hello, I've encountered the following issue while calibrating some VLBA data from the NRAO Archive: I'm following the suggested calibration steps from the AIPS Cookbook and I'm trying t...
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<div>Hello,</div><div><br></div><div>I've encountered the following issue while calibrating some VLBA data from the NRAO Archive:</div><div><br></div><div>I'm following the suggested calibration steps from the AIPS Cookbook and I'm trying to correct the instrumental delays by running a fringe fit on a short and bright scan. However, despite finding good solutions during the coarse search (SNR= 999), FRING seems to ruin them during the LS part (SNR< 3, <b>see fring.txt</b> attached). </div><div>If I disable it with dparm(5) 1, then I get the right solutions (<b>see fring_noLS.txt</b>). The change in delays between these two steps seems tiny, so I don't understand why this is happening.</div><div><br></div><div>The dataset is VLBA_BL292B_bl292b_BIN0_SRC0_1_220324T143728.idifits, but it has happened also in VLBA_BL292Q_bl292q_BIN0_SRC0_1_220628T191400.idifits and VLBA_BL292W_bl292w_BIN0_SRC0_1_220411T141507.idifits.</div><div><br></div><div>It only happens in the 8GHz portion of the data (last 2 IFs), and it does not occur in other files from the same project and frequency (e.g. VLBA_BL292O_bl292o_BIN0_SRC0_1_220318T141738.idifits)</div><div><br></div><div>I ran FRING with the following parameters, rest is default:</div><div>CALSOUR "J0237+2848"</div><div>TIMERANG 0 22 8 30 0 22 9 30</div><div>DOCALIB 1</div><div>GAINUSE 0</div><div>REFANT 4</div><div>SOLINT -1</div><div>APARM 2 0 0 0 0 2 5</div><div>DPARM 1 500 0 0 0 0 0 0 1 </div><div><br></div><div>Before this step I've run TECOR, CLCOR (for EOPS and PANG), and ACCOR.</div><div><br></div><div>Thank you for your time,</div><div>Diego Alvarez</div><div><br></div><div> </div>
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<strong>Attachments</strong>
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• <a href="https://help.nrao.edu/file.php/6188SAKZBBHWGM6187969D52738T/fring_noLS.txt?access_token=sml8b0-tqxkowahxw-743746f205e09b9b3bea23f3282d599593b0f8db" style="color: #0065A3; font-family: Helvetica, Arial, sans-serif; font-weight: normal; padding: 0; margin: 0; text-align: left; line-height: 1.3; text-decoration: underline;">fring_noLS.txt</a> (5.61 KB)
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• <a href="https://help.nrao.edu/file.php/6188YCWAYMRWYP6187970871DC1T/fring.txt?access_token=sml8b0-fxakaoyyxg-1d07be14a98d45525c21d57d07bd97746589b799" style="color: #0065A3; font-family: Helvetica, Arial, sans-serif; font-weight: normal; padding: 0; margin: 0; text-align: left; line-height: 1.3; text-decoration: underline;">fring.txt</a> (14.69 KB)
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