Dear PI Due to power perturbations at the VLA which occurred during the observation of BD099A on August 12, 2004, the clock was resynced one or more times during the experiment. This has caused a large delay offset which at this time is indeterminent. In several clock trials run during preparation for correlation, the real delay in effect during the observation has not been found, therefore no fringes have been detected to the VLA antenna in use for this experiment. It seems at this time unlikely that we will "find" this antenna. If the VLA antenna is critical to your science in this experiment, you may choose to abandon correlation of this observation and petition schedsoc@nrao.edu for a re-observation of this program. If you choose to have this observation correlated, it is likely there will be no data for the VLA antenna and the case for re-observation will be weakened. Regards, Ken Hartley NRAO Data Analyst From bclark@nrao.edu Thu Aug 26 11:57:33 2004 Return-Path: Date: Thu, 26 Aug 2004 11:57:32 -0600 (MDT) From: Barry Clark To: analysts@nrao.edu, schedsoc@nrao.edu, pperley@nrao.edu, julvestad@nrao.edu Subject: Re: bd099a X-Sun-Charset: US-ASCII Content-Length: 2755 X-Lines: 76 Status: RO I believe this is a request to abandon the observation. Looks to me like we should reschedule this before antenna 16 goes away. Rather short timescale, but I suggest September 6, 0530-1630 UT. If nobody objects I'll arrange that. ----- Begin Included Message ----- >From ddallaca@ira.cnr.it Thu Aug 26 03:07:16 2004 Return-Path: Date: Thu, 26 Aug 2004 11:07:05 +0200 (CEST) Subject: Re: bd099a From: "Daniele Dallacasa" To: , In-Reply-To: <200408252248.QAA06536@terminus.aoc.nrao.edu> References: <200408252248.QAA06536@terminus.aoc.nrao.edu> X-Priority: 3 Importance: Normal Cc: , Reply-To: ddallaca@ira.cnr.it X-Mailer: SquirrelMail (version 1.2.11) MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Virus-Scanned: by amavisd-new at ira.cnr.it X-MailScanner-Information: Please contact postmaster@cv.nrao.edu for more information X-MailScanner: Found to be clean X-MailScanner-SpamCheck: not spam, SpamAssassin (score=-4.9, required 7, autolearn=not spam, BAYES_00 -4.90) X-MailScanner-From: ddallaca@ira.cnr.it X-Lines: 41 Status: RO > Dear PI > > Due to power perturbations at the VLA which occurred during the > observation of BD099A on August 12, 2004, the clock was resynced one or > more times during the experiment. This has caused a large delay offset > which at this time is indeterminent. In several clock trials run during > preparation for correlation, the real delay in effect > during the observation has not been found, therefore no fringes have > been detected to the VLA antenna in use for this experiment. > > It seems at this time unlikely that we will "find" this antenna. If the > VLA antenna is critical to your science in this experiment, you may > choose to abandon correlation of this observation and petition > schedsoc@nrao.edu for a re-observation of this program. If you choose to > have this observation correlated, it is likely there will be no data for > the VLA antenna and the case for re-observation will be > weakened. > Dear all, what a pity..... all the other antennas worked well.... Indeed the VLA antenna is critical to this experiment since we need a bunch of good short spacings for relatively extended components and for spectral work at high frequencies. Therefore we ask for reobservation, although we are aware that not correlating the successful 10 VLBA antennas is a waste. Best Regards, Daniele