[GMVAtech 48] Re: Fwd: *Urgent* Availability 2022

[Pablo Torne]

Hi Thomas, all,

just to clarify, the March-October PV planned shutdown is *for year 2022*. In 2021 we are in for all VLBI sessions.

Cheers,
Pablo

-- 
Dr. Pablo Torne 
Astronomy and Science Support Group
Instituto de Radioastronomia Millimetrica, IRAM
E-18012 Granada, Spain 
email:torne at iram.es <mailto:torne at iram.es> 

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