From fghigo@nrao.edu Mon Apr 5 09:22 MDT 2004 Date: Mon, 05 Apr 2004 11:22:34 -0400 From: Frank Ghigo User-Agent: Mozilla/5.0 (Windows; U; Windows NT 5.0; en-US; rv:1.0.2) Gecko/20021120 Netscape/7.01 X-Accept-Language: en-us, en MIME-Version: 1.0 To: Craig Walker CC: gbtlocal , "analysts@aoc.nrao.edu" Subject: VLBI project BW070 Content-Transfer-Encoding: 7bit X-MailScanner: Found to be clean, Found to be clean X-MailScanner-SpamCheck: not spam, SpamAssassin (score=-5.4, required 7, BAYES_01 -5.40, USER_AGENT_MOZILLA_UA 0.00), not spam, SpamAssassin (score=-5.4, required 7, BAYES_01 -5.40, USER_AGENT_MOZILLA_UA 0.00) X-MailScanner-Information: Please contact postmaster@aoc.nrao.edu for more information X-Lines: 37 Status: RO We observed VLBI project BW070 with the GBT at Q_band (43 GHz). - Weather: The weather did not cooperate. We had repeated waves of snow storms and high winds. Time lost due to wind shutdowns: 02:42 - 03:00 UT 03:57 - 08:21 09:44 - end of run. During the 0400-0800 shutdown, there was also a problem with the realtime antenna controller (CCU), which Tim and Joe came in and fixed. - Pointing: During the periods of benign wind, we were unable to get a sucessful fit to pointing data. We adjusted the pointing by "dead reckoning". We could see the strong pointing source 3C273 showing a reasonable beam pattern in the DCR display, but GFM did not do a good fit. This may have been because the weather caused too much variation in the amplitudes of sucessive scans across the object. I think GFM's criteria should be less strict. We ran with the dynamic corrections on, and since we did see the calibrator in the on-line display, I think that the sources were in the beam during those times when we could observe, but we don't know how well peaked up we were. - Phase cal: The good news is that the phase cals looked to be well-behaved, with amplitudes around 2%. Tapes HST00214 and EVNT0348 will be shipped to Socorro today. -- frank