EVLA, VLA, VLBA Archive Search Parameters
| Parameter | Example | Default | URL Parm | Comments |
|---|
| General Search Parameters |
| Program ID | AB973 | All | PROJECT_CODE | Observing Program Name (Project Code) |
| Project Segment | A | All | SEGMENT | Note 1. |
| Observer Name | Benson | All | OBSERVER | Name : Last, First |
| Archive File Name | vla2007-10-12.dat | All | ARCHIVE_VOLUME | < Note 2 |
| Observe Start Time | 2007-Oct-12 12:0:0 | All | TIMERANGE1 | Note 3 |
| Observe Stop Time | 2007-Oct-12 18:0:0 | All | TIMERANGE2 | Note 3 |
| Object Search Field: |
| Object Name | 3C120 | All | SOURCE_ID | Target source name |
| Search Type | NED Resolver | SIMBAD then NED | SRC_SEARCH_TYPE | Note 4 |
| Calibrator Src. Type | All Srcs | CALIB_TYPE | All Srcs | |
| Directed Search Field: |
| RA or Longitude | 13:31:23.54 | All | CENTER_RA | Note 5 |
| DEC or Latitude | 21:13:34.56 | All | CENTER_DEC | Note 5 |
| Coord Frame | Ecliptic | Equatorial | FRAME | Equatorial, Ecliptic or Galactic |
| Equinox | B1950 | J2000 | EQUINOX | J2000 or B1950 |
| Search Radius | 0.0 | 1.0 | SRAD | Note 6 |
| Sensitivity and Resolution: |
| Min. Exposure | 600.0 | All | MIN_EXPOSURE | Time on source/freq/project (secs) |
| Image Sensitivity | 10.0 | All | SENS | Image rms (mJy/beam) |
| Image Resolution | 0.1 | All | RESOL | Restoring beam minor axis (arcsec) |
| Observing Configurations: |
| Telescope | VLA | All | TELESCOPE | VLA, VLBA, GBT (trace amounts) |
| Telescope Config. | A, AB, BnA | All | TELESCOPE_CONFIG | VLA array configurations |
| Telescope Subarrays | 1,2 | All | SUBARRAY | VLA, VLBA subarray id numbers |
| Observing Bands | X,K,Q | All | OBS_BANDS | Note 7 |
| Observing Mode | Line | All | OBS_MODE | All, line or continuum |
| Correlator Mode | 2AB | All | CORR_MODE | VLA Correlator Mode |
| Polarization | RR,LL pair | All | OBS_POLAR | Note 8 |
| Freq. Range Min. | 1665.0 | All | OBSFREQ1 | Frequency (MHz) |
| Freq. Range Max. | 1668.0 | All | OBSFREQ2 | Frequency (MHz) |
| BandWD Range Min. | 12.5 | All | OBSBW1 | Frequency (MHz) |
| BandWD Range Max. | 50.0 | All | OBSBW2 | Frequency (MHz) |
| Output Control Parameters |
| Query Return Type | Obs. Scans | Archive Files | QUERYTYPE | Note 9 |
| Archive Data Type | Raw Data | All | DATATYPE | Note 10 |
| Output Tbl Format | VOTable | HTML | PROTOCOL | HTML, VOTable, Text |
| Max Output Rows | 1000 | No Limit | MAX_ROWS | |
| Sort Order Col.1 | Time On Src | Starttime | SORT_ORDER | Note 11 |
| Sort Order Col.2 | Project Code | Starttime | SORT_ORDER2 | Note 11 |
Notes
| Reference | Note |
|---|
| Note 1 | Program Segment : Character code in range of A to ZZ. Program observing sessions separated by 12 hours have distinct segment codes. |
| Note 2 | Archive File Name : The archive system is presented with many different file types from telescopes and processes. The file names are generated before the files are available to the archive, so the physical file names do not follow a unified convention. In order to the make the file names more understandable, we have created a logical file name : telescope/container/physical_filename. For files that were transfered from archive tapes, the container is the tape volume name and the file name is file_1, file_2..etc. For the past several years, the VLA has delivered daily raw data files to a staging area in the AOC. These files are logically named like : VLA/2007-10/vla2007-10-12.dat, where the container is a subdirectory for data from that month. Data files from AIPS processing are generally FITS files, and have unpredictable file names. The Archive File Name query element will resolve archive files by partial string matches. So for example, the VLA data file for Oct 12, 2007 may be found using a string segment like this : '2007-10-12'. |
| Note 3 | Observe Start or Stop Times : Query parameters which return data, images or information that are entirely or partly within the specified time range. Dates and times currently must be entered in one format. Dates like : yyyy-mmm-dd (2007-Oct-10), times like : hh:mm:ss (10:45:30). The start/stop time parameters MUST contain a date, a time is optional. Test versions of the archive system now also support MJD.day_fraction (54385.44792). |
| Note 4 | Search Type : You may request the query tool to search for a partial string match of object names in the archive, or let the system send the object name to the SIMBAD or NED Name Resolvers. The Search Type parameter offer several options : SIMBAD if no results followed by NED, NED if no results followed by SIMBAD, SIMBAD only, NED only. SIMBAD and NED return a RA, Dec (J2000) pair. In this case a cone search is initiated centered on the SIMBAD/NED position with a search radius using the Search Radius parameter. |
| Note 5 | Search Longitude, Latitude : A search field on the sky may be explicitly specified. The query tool will return a list of images or observing scans whose reference position is inside the search field. The center of a search field is specified by longitude and latitude angles : RA, Dec in B1950 or J2000 frame (ecliptic longitude and latitude, or galactic or super-galactic latitudes and longitudes - Not Yet Implemented). The search radius may be set by specifying the radius parameter.
The entry format for RA, Dec, lontitude, latitude may be hours-mins-secs (12h30m25.5s, 12:30:25.5, 12 30 25.5), degrees-arcmins-arcsecs (21d35'18.5", 21:35:18.5, 21 35 18.5), or decimal degrees.
|
| Note 6 | Search Radius : The radius on the sky about a specified field center position in which all cataloged observations will be returned.
The entry format can be anyone of the following angle formats: 2d30'20.5" or simply 2 (degrees) or the default value 1.0' (arcminutes). An entry without units defaults to degrees. The maximum search radius is 45.0 degrees.
Automatically scalable search radius: A search radius on the sky whose radius is equal the the half-power angular radius of a VLA antenna primary beam. This radius is scalable with the inverse of the observing frequency. Archive data within this radius surrounding the observed sky position is considered usable.
The scaled search radii for the VLA are (freq_band/search_rad in arcmins) : 4/700.0, P/150.0, L/30.0, C/9.0, X/5.4, U/3.0, K/2.0, Q/1.0
For all VLBA observations, the scalable search radius is set to one arc-min.
|
| Note 7 | Observing Bands : The VLA and VLBA observing bands are : 4, P, L, S, C, X, U, K, Q |
| Note 8 | Polarization search options :
RR, LL, RL, LR
RR, LL pair
RR or LL
RR only
LL only
All |
| Note 9 | Query Return Types : Archive users and processes may select a type of tabular results
List of Downloadable Archive Data Files
List of Individual Observing Scans
Observing Scans Summary - Single rows of summed scans per project/source/frequency/subarray
List of Archive Image Files
List of Observing Projects
List of Observing Project Segments |
| Note 10 | Archive Data Type(s) : All, Raw Data, Calibrated Data |
| Note 11 | Output Sort Order : starttime, source_id, project_code, subarray_id, Stoptime, obs_bands, telescope_config, arch_file_name, vlba_job_number, time_on_source. The sort order may be ascending or descending. |
-- JohnBenson - 16 Oct 2007
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