From schedsoc@aoc.nrao.edu Tue Dec 20 17:21:54 2005 Date: Tue, 20 Dec 2005 17:21:42 -0700 (MST) From: Scheduling Officer To: "VLBI Observers (Aspen only)" Cc: Laurent Loinard , Barry Clark , pperley@aoc.nrao.edu, amiodusz@aoc.nrao.edu Subject: Re: Request for reobservation Lisa: Please go ahead and arrange a makeup segment. Thanks. - Joan *********************************************************************** VLA/VLBA Scheduling Officers schedsoc@nrao.edu NRAO, Socorro, New Mexico, USA http://www.aoc.nrao.edu/~schedsoc/ *********************************************************************** On Tue, 20 Dec 2005, Laurent Loinard wrote: > > Hello, > > I am the PI of the project BL128 which is a program designed to > measure the trigonometric parallax of several sources in Taurus and > Orion through multi-epoch VLBA observations. After the first > observation of the source DoAr21 (that was observation BL128CA), we > realized that the position we entered (which was based on old VLA > data) was off by almost 5 arcsec from the target. So we requested that > the remaining 5 observations be done with new, corrected > coordinates. The second observation (BL128CB) was obtained about a > month ago, and correlated recently (it got in the archive late last > week), and I just reduced it. Unfortunately, although the pointing > position was indeed corrected, the correlation position was not. From > what I understand, the correlator used a position taken from a > database that was not updated, although we had specifically requested > in the schedule that the new position should be used for all purposes. > > So, I was wondering if this source could be reobserved soon (say > within two weeks), so as to keep the project on schedule. Since the > data will be used for a PhD thesis, it is important that the > observations be complete on a timely fashion, so the student won't be > delayed in her work. > > With best regards, > Laurent >