[evlatests] [Fwd: Data problem in observation 11B-238_sb6661969_2]

Tue Jan 3 12:28:54 EST 2012

    It I understand that screen-shot correctly -- the blank areas look 
exactly like what I've had.  It looks probable that they have been 
affected by these two 'failure modes'.

    Rick

Data Analysts wrote:
>
>
> ------------------------------------------------------------------------
>
> Subject:
> Data problem in observation 11B-238_sb6661969_2
> From:
> "Dominik A. Riechers" <dr at astro.caltech.edu>
> Date:
> Mon, 2 Jan 2012 10:05:51 -0800
> To:
> analysts at aoc.nrao.edu
>
> To:
> analysts at aoc.nrao.edu
>
>
> Hello,
>
> we have just inspected the data set referenced below, observed last night.
> Unfortunately, about half of the data appear to be missing (see attached
> screen shot).
>
> It is possible that this is a problem with the downloaded file (obtained
> briefly after the track ended), it however appears entirely possible that
> we may be facing a correlator problem.
>
> We will attempt to re-download the file to verify our findings, but given
> the proximate end of D array, I felt that it would be good to report this
> issue as early as possible.
>
> If you come to the same conclusion, I would like to request a repeat of
> this track if possible (i.e., to flag the trial as failed). If not
> possible before the end of D array, DnC observations would be acceptable
> as well.
>
> Thank you,
> Dominik
>
>
> ---------------------------- Original Message ----------------------------
> Subject: EVLA Operator Log: 2012-01-02_1124_11B-238
> From:    "evlaops" <evlaops at nrao.edu>
> Date:    Mon, January 2, 2012 6:05 am
> To:      dr at astro.caltech.edu
>          rji at roe.ac.uk
>          cdd at phobos.caltech.edu
>          alexander.conley at colorado.edu
>          acooray at uci.edu
>          david.clements at imperial.ac.uk
>          duncan at isc.astro.cornell.edu
>          Lingyu.Wang at sussex.ac.uk
>          jwardlow at uci.edu
>          s.oliver at sussex.ac.uk
>          jjb at astro.caltech.edu
>          P.D.Hurley at sussex.ac.uk
>          mrupen at nrao.edu
> --------------------------------------------------------------------------
>
>
> Pointing solutions have been attached.  A description of the file describing
> the corrections can be found at:
> http://science.nrao.edu/evla/observing/specialtopics/refpoint
>
> ********************************************************************************
>
> Log Name:          2012-01-02_1124_11B-238       Date:            02-Jan-2012
> Project Code:      11B-238                       SBID:            6661969
> Observation Type:  Science                       # Subarrays:     1
> Observing Mode:    Mixed Modes                   Configuration:   D
> Bands Used:        Ka C                          Decommissioned:  17
> Source File(s):    11B-238_sb6661969_2
> Observer:          Dr. Dominik A. Riechers
> Observer E-mail:   dr at astro.caltech.edu
> Operator(s):       Sam Gilmore
>
> API (Atmospheric Phase Interferometer) information can be found at:
> http://science.nrao.edu/facilities/evla/observing/specialtopics/API
> Adobe PDF version of this log is located at:
> http://www.vla.nrao.edu/operators/logs/
> Visibility data is updated each day at IAT/UT midnight and is available
> from the
> online archive at: http://archive.nrao.edu
>
>
> ***** WEATHER INFORMATION *****
>
> Time(UTC)       Dew Pt.  Temp.  Wind           Bar. Press.  API RMS
> Phase(degs)
> 02Jan 11:29:53  -11.6    -6.9   Calm           INOP         0.8
> 02Jan 13:00:12  -11.7    -6.8   Calm           INOP         1.1
>
> *** Operator comments for the above weather entries ***
>
> 02Jan 11:29:53     Sky clear.
> 02Jan 13:00:12     Sky clear.
>
>
> ***** COMMENTS AND OUTAGES *****
>
> Outage information format:
> Start, End, Category, Form#, # of Antennas Affected, Downtime(minutes)
> Antenna ID(s) and Data Effect
> Outage Description
>
>
> Number of Antennas Used: 27
>
> 02Jan 11:24:24
> Starting project 11B-238.
>
> 02Jan 11:24:24
> The band(s) used is(are): Ka C.
>
> 02Jan 11:26:00
> On source J1331+3030 with all available antennas.
>
> 02Jan 11:24:24
> Antenna(s): 19 20
> do not have good baseline positions determined for them because they were
> moved to their present location recently.  Please check for any significant
> errors and let the Data Analysts (email - analysts at nrao.edu) know what
> you find. Thank you.
>
> 02Jan 11:24:24
> Your data were taken with the new EVLA computer system controlling the Array.
> Observers should carefully review their observations.
> Data of a small fraction of projects, in particular those involving novel
> use of
> the Widar correlator, will undergo inspection at the NRAO; if that is the
> case you will receive a separate notification to that effect.
> For the latest information about accessing your data from the archive, visit:
> http://science.nrao.edu/facilities/evla/data-archive/evla/index.
> For further questions please use the NRAO helpdesk at:
> http://science.nrao.edu/observing/helpdesk.
>
> 02Jan 11:24:24
> Note: To support our ongoing RFI monitoring efforts, any feedback from your
> program on RFI can be sent to: nrao-rfi at nrao.edu.
> The key information to provide is:
>   - Observation/project code
>   - Frequency and Time of the observations
>   - The characteristics of the RFI signal, in particular if it is
> continuous or
>     intermittent?
>   - If possible, a spectrum of the RFI should be included in the e-mail.
> Thanks very much for your support; this information will be continuously
> updated
> on the EVLA science pages at:
> http://science.nrao.edu/evla/observing/RFI/index
>
> 02Jan 11:24:24
> Antennas in the D-array may be shadowed at low elevations.  If shadowing
> occurs, sensitivity will be affected.
>
> 02Jan 11:24:24   02Jan 13:54:01   FRONT END         C130086       0.86  
> 128.7
> Antenna(s) 1 (Data: Lost):
> Ka-band receiver removed for repair.
>
> 02Jan 11:24:24   02Jan 13:54:01   OPTICAL FIBER     C130481       0.25   37.4
> Antenna(s) 23 (Data: Lost):
> Fringe amplitude weak/dead IF C at Ka and C-bands
>
> 02Jan 11:24:24   02Jan 13:54:01   LO/IF             C130485       0.07   10.5
> Antenna(s) 1 (Data: Lost):
> Fringe amplitudes dead IFs A and C at C-band.
>
>
> End Time                 Total Program Time    % Downtime    Total Downtime
>                          (minutes x 27 ants.)                  (in minutes)
>
> 02-Jan-2012 13:54:01     4039.7                4.4%          176.5
>
>   
> ------------------------------------------------------------------------
>
> ------------------------------------------------------------------------
>
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