<html><head><meta http-equiv="Content-Type" content="text/html; charset=utf-8"></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; line-break: after-white-space;" class="">Hi Thomas, all,<div class=""><br class=""></div><div class="">just to clarify, the March-October PV planned shutdown is *for year 2022*. In 2021 we are in for all VLBI sessions.</div><div class=""><br class=""></div><div class="">Cheers,</div><div class="">Pablo</div><div class=""><br class=""></div><div class=""><div class="" style="caret-color: rgb(0, 0, 0); color: rgb(0, 0, 0);"><font size="2" class="">-- <br class="">Dr. Pablo Torne <br class="">Astronomy and Science Support Group<br class="">Instituto de Radioastronomia Millimetrica, IRAM</font></div><div class="" style="caret-color: rgb(0, 0, 0); color: rgb(0, 0, 0);"><font size="2" class="">E-18012 Granada, Spain <br class=""><a href="mailto:torne@iram.es" class="">email:torne@iram.es</a> <br class=""></font></div></div><div class=""><div><br class=""><blockquote type="cite" class=""><div class="">On 22 Jan 2021, at 14:47, Thomas Krichbaum <<a href="mailto:tkrichbaum@mpifr-bonn.mpg.de" class="">tkrichbaum@mpifr-bonn.mpg.de</a>> wrote:</div><br class="Apple-interchange-newline"><div class=""><div class="">Hi<br class=""><br class="">sorry for the bad news. According to the eMail below it is very likely<br class="">that we won't have PV for EHT and GMVA in 2021.<br class=""><br class="">best Thomas<br class=""><br class=""><br class="">-------- Forwarded Message --------<br class="">Subject: <span class="Apple-tab-span" style="white-space:pre"> </span>Re: *Urgent* Availability 2022<br class="">Date: <span class="Apple-tab-span" style="white-space:pre"> </span>Fri, 22 Jan 2021 14:13:28 +0100<br class="">From: <span class="Apple-tab-span" style="white-space:pre"> </span>Miguel Sanchez Portal <<a href="mailto:msanchez@iram.es" class="">msanchez@iram.es</a>><br class="">To: <span class="Apple-tab-span" style="white-space:pre"> </span>Remo Tilanus <<a href="mailto:rtilanus@arizona.edu" class="">rtilanus@arizona.edu</a>><br class="">CC: <span class="Apple-tab-span" style="white-space:pre"> </span>Geoff Crew <<a href="mailto:gbc@haystack.mit.edu" class="">gbc@haystack.mit.edu</a>>, Alan Roy<br class=""><<a href="mailto:aroy@mpifr-bonn.mpg.de" class="">aroy@mpifr-bonn.mpg.de</a>>, Ming-Tang Chen <<a href="mailto:mtchen@asiaa.sinica.edu.tw" class="">mtchen@asiaa.sinica.edu.tw</a>>,<br class="">Satoki Matsushita <<a href="mailto:satoki@asiaa.sinica.edu.tw" class="">satoki@asiaa.sinica.edu.tw</a>>, Per Friberg<br class=""><<a href="mailto:p.friberg@eaobservatory.org" class="">p.friberg@eaobservatory.org</a>>, Izumi Mizuno<br class=""><<a href="mailto:i.mizuno@eaobservatory.org" class="">i.mizuno@eaobservatory.org</a>>, Gopal Narayanan <<a href="mailto:gopal@astro.umass.edu" class="">gopal@astro.umass.edu</a>>,<br class="">David Sanchez <<a href="mailto:domars@inaoep.mx" class="">domars@inaoep.mx</a>>, Michael Bremer <<a href="mailto:bremer@iram.fr" class="">bremer@iram.fr</a>>,<br class="">Salvador Sanchez <<a href="mailto:sanchez@iram.es" class="">sanchez@iram.es</a>>, Helge Rottmann<br class=""><<a href="mailto:rottmann@mpifr-bonn.mpg.de" class="">rottmann@mpifr-bonn.mpg.de</a>>, Jonathan Weintroub<br class=""><<a href="mailto:jweintroub@cfa.harvard.edu" class="">jweintroub@cfa.harvard.edu</a>>, Garrett Karto Keating<br class=""><<a href="mailto:garrett.keating@cfa.harvard.edu" class="">garrett.keating@cfa.harvard.edu</a>>, Dan Marrone <<a href="mailto:dmarrone@arizona.edu" class="">dmarrone@arizona.edu</a>>,<br class="">Lynn Matthews <<a href="mailto:lmatthew@franklin.haystack.mit.edu" class="">lmatthew@franklin.haystack.mit.edu</a>>, Michael Lindqvist<br class=""><<a href="mailto:michael.lindqvist@chalmers.se" class="">michael.lindqvist@chalmers.se</a>>, Eduardo, Ros <<a href="mailto:eros@mpifr-bonn.mpg.de" class="">eros@mpifr-bonn.mpg.de</a>>,<br class="">Vincent Fish <<a href="mailto:vfish@haystack.mit.edu" class="">vfish@haystack.mit.edu</a>>, Thomas Krichbaum<br class=""><<a href="mailto:tkrichbaum@mpifr-bonn.mpg.de" class="">tkrichbaum@mpifr-bonn.mpg.de</a>><br class=""><br class=""><br class=""><br class="">Dear Remo, all,<br class=""><br class="">Regarding the 30m, I’m afraid that our telescope upgrade schedule is<br class="">very tight, since all on-site activities must be essentially completed<br class="">by 2022. Hence, we must start the on-site work as soon as possible.<br class="">Currently, I would expect a shut-down from mid March to maybe late<br class="">October. There is still a level of uncertainty in the schedule (mostly<br class="">due to the uncertainty in the formal start of the project with the<br class="">contractor company -the ITT has not even sent yet) but at this stage it<br class="">is our best guess. <br class=""><br class="">Best regards,<br class=""><br class="">Miguel<br class=""><br class=""><br class=""><br class=""><blockquote type="cite" class="">On 21 Jan 2021, at 20:10, Remo Tilanus <<a href="mailto:rtilanus@arizona.edu" class="">rtilanus@arizona.edu</a><br class=""><<a href="mailto:rtilanus@arizona.edu" class="">mailto:rtilanus@arizona.edu</a>>> wrote:<br class=""><br class="">Dear all,<br class=""><br class="">GMVA needs to fix their observing slot for 2022, unfortunately as<br class="">usual 'urgently'.<br class="">Can you asap. inform me about known operational constraints for your<br class="">station in Mar/Apr of 2022?<br class="">I have learned that the 30M may be down for major refurbishments from<br class="">Mar 15 for about 6 months, which would be very unfortunate. We can<br class="">hope (sorry :) their schedule will slip or GMVA+EHT combined can<br class="">convince IRAM to delay by a few weeks, but we can not count on that.<br class="">It argues for EHT can to queeze in as early as possible in March.<br class=""><br class="">A few pointers:<br class=""><br class=""> * Typically APEX's summer shutdown lasts until Mar 15, which<br class=""> normally sets a lower bound on the dates. As usual, ALMA will be<br class=""> shutdown until Mar 1.<br class=""> Any chance APEX may be made available before Mar 15 in 2022? <br class=""> * Easter in 2022 will be Apr 17, which probably is an upper bound<br class=""> weather-wise for stations like the LMT anyway. But it also means<br class=""> spring break in some countries from Apr 9. This sets a "soft"<br class=""> upper limit: best to be avoided and not very suited to start the<br class=""> EHT window during that week.<br class=""> * One other option is to 'split' a 10-12 day EHT window around the<br class=""> GMVA week. This kind of agile scheduling is of course a long-term<br class=""> objective for the EHT. Are there major reason stations would /not/<br class=""> be able to support such setup in 2022?<br class=""> * It looks like GMVA + EHT VLBI in 2022 may be a back-to-back ~3<br class=""> week event, something we have avoided these past years. Although<br class=""> most stations are only in one or the other, please let me know if<br class=""> this is an issue.<br class=""><br class="">please respond asap.<br class=""><br class="">Remo<br class=""><br class="">-- <br class="">Remo Tilanus<br class="">Research Professor and Astronomer<br class="">Steward Observatory & Department of Astronomy, University of Arizona <br class="">Operations manager Event Horizon Telescope & Project Manager BlackHoleCam<br class="">Operations manager Arizona Radio Observatory<br class=""><a href="mailto:rtilanus@arizona.edu" class="">email: rtilanus@arizona.edu</a> <br class=""></blockquote><br class=""><br class=""><br class="">_______________________________________________<br class="">GMVAtech mailing list<br class=""><a href="mailto:GMVAtech@lists.mpifr-bonn.mpg.de" class="">GMVAtech@lists.mpifr-bonn.mpg.de</a><br class="">https://lists.mpifr-bonn.mpg.de/mailman/listinfo/gmvatech<br class=""></div></div></blockquote></div><br class=""></div></body></html>