Index of the WSRT ArchiveBrowser help items:
- How to use the WSRT Archive browser
- The project identification field
- The source field
- The MFFE-Band field
- The position Right Ascension (RA) field
- The position Declination (DEC) field
- The reference field
- The search area shape field
- The ΔRight Ascension (RA) field
- The ΔDeclination (DEC) field
- The ΔRadius field
- How to upload a batch file to the WSRT Archive browser
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How to use the WSRT Archive Browser:
The WSRT ArchiveBrowser is a simple interface which allows you to
do simple searches in the archive of WSRT observations. The interface
allows two modes of searching:
- Searching on a source name
- Searching at or around a given position on the sky
Additionally a frequency band (MFFE band) can be selected to narrow
down the search.
After filling in the appropriate fields in the browser window, the "do
query" button (at the bottom left) should be pressed. This will start
a search through the underlying database. The resulting matches are
presented in a separate browser window. For each matching observation,
some details are provided. Also displayed is a button with the text
"more>>>"; this will lead you to a new page that presents all database
fields for the selected observation. For the moment, this is provided
as an unstructured list.
The database on which the Archive Browser operates contains nearly all
observations from the year 2000 up to the last. For these observations
the original datasets can easily be retrieved and, if required,
exported to the interested user. Please contact Tony Foley
(foley@astron.nl) if you have a request for archival data.
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Project:
In this field you can enter a project identification for the project you
are interested in. Wildcards are allowed (see the examples below).
Format:
<project code>/<project number>
A project identication consists of two parts, separated by a
slash character. The first part is the project code (10 characters
max.), and the second part is the project number or semester code (10
characters max.). The search will not differentiate between lowercase
and uppercase characters.
Only the characters a-z, A-Z, 0-9, *, /, - and + are valid;
* is used as the wild-character
/ is mandatory and must only occur once
Example(s):
1)
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Source:
In this field you can enter the source name of the source you are
interested in. Wildcards are allowed (see the examples below). Note,
that the database contains the source name as it was entered while
specifying an observation. This may differ from the IAU
conventions. Also, sometimes specific remarks are added to a
sourcename (e.g. NGC891-36m). To also catch these exceptions,
wildcards can and should be used.
Format:
Only the characters a-z, A-Z, 0-9, * , - and + are valid;
* is used as the wild-character
Example(s):
1) 3c286 , 3C286 , 3C 286, 3 C 2 8 6 or 3 c 2 8 6 all give
the same result.
2) 3C* means all sources with names starting with 3C
3) *28* means all sources with the string "28" in their name
4) 3*286 means all sources with names starting with 3 and ending with 286
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MFFE-Band:
Here you select the MFFE frequency band to query. An MFFE-band is a
frequency band that is accessible by the Multi-Frequency FrontEnds
(MFFEs) of the WSRT. The MFFEs are rotatable frontends that allow
rapid switching between frequency bands. The MFFEs harbour a variety
of receivers that operate over a wide range in frequency (see the list
given below). The L-Band receivers, and those operating at higher
frequencies have 160 MHz instantaneous bandwidth, those bands
operating at frequencies below that of L-Band have 80 MHz bandwidth
(due to filter and feed characteristics). The Low Frequency FrontEnds
(LFFEs) are a separate receiver system with 65 MHz instantaneous
bandwidth.
The available MFFE Bands and their nominal frequency ranges are:
LFFE : " ?>
UHFL : " ?>
92cm : " ?>
49cm : " ?>
UHFH : " ?>
LBand : " ?>
13cm : " ?>
6cm : " ?>
3.6cm : " ?>
If you leave the selection box empty, results from all frequency bands
will be returned.
Example(s):
none
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Position Right Ascension (RA):
Here you can enter the Right Ascension of a position on the sky for
which you request archive information. This option will mostly be used
in combination with a search field (see below).
Format:
HH:MM:SS.ss, with
HH : Hours, range 0 .. 23
MM : Minutes, range 0 .. 59
SS : Integer Seconds, range 0 .. 59
ss : Decimal Seconds, range 0 .. 99
Example(s):
15:34:23.89
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Position Declination (DEC):
Here you can enter the Declination of a position on the sky for which
you request archive information. This option will mostly be used in
combination with a search field (see below). Note, that the WSRT
cannot observe sources below -37 degree declination.
Format:
(+/-)DD:MM:SS.ss
DD : Degree, range -37 .. 90
MM : Minute, range 0 .. 59
SS : Integer second, range 0 .. 59
ss : Decimal second, range 0 .. 99
Example(s):
-23:45:12.91
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Reference:
Here you can select a specific epoch for the position you have filled
in. Supported are B1950 and J2000. Important to realize is that
if an epoch is selected, only observations originally specified in
that epoch are returned. There is no on-the-fly conversion of the
filled in coordinates! To prevent this, select the "all" button.
Format:
Select a value by toggling a radiobutton of this item
J2000 : Search only for sources specified in J2000
B1950 : Search only for sources specified in B1950
all : Ignore any epoch specification
Check the box 'Epoch conversion' if the ra/dec range should be
converted before searching the database.
Example(s):
1. To search the database for sources specified in J2000 only,
select J2000 and uncheck Epoch conversion
2. To search the database for sources specified in J2000 and
B1950, using the entered coordinates 'as-is', select Any
and uncheck Epoch conversion
3. To search for sources specified in B1950, but also the J2000
sources, but with the coordinates converted to J2000, select
B1950 and check Epoch conversion
none
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Search Area Shape:
This allows you to specify a search area shape around the coordinates
entered in the position fields. We offer the following options:
none : Search only for the exact position given above.
: Use a rectangular shape of size
Δ RA in Right Ascension and
Δ DEC in declination.
: Use a circle shape with a radius of
Δ Radius degree.
: Use a search area given by the approximate half-power beam width (HPBW).
This is, of course, strongly frequency dependent and therefore a
MFFE band must thus be selected. The HPBW is determined at the
central frequency of the selected MFFE band and as given in the
following table:
LFFE : " ?>
UHFL : " ?>
92cm : " ?>
49cm : " ?>
UHFH : " ?>
LBand : " ?>
13cm : " ?>
6cm : " ?>
3.6cm : " ?>
Example(s):
none
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Δ RA (Right Ascension):
Fill in the size of the Right Ascension axis of the rectangular search
area. You will also have to fill in the Δ DEC field.
Format:
HH:MM:SS.ss
HH : Hours, range 0 .. 23
MM : Minutes, range 0 .. 59
SS : Integer Seconds, range 0 .. 59
ss : Decimal Seconds, range 0 .. 99
Example(s):
00:05:00.15
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Δ DEC (Declination):
Fill in the size of the Declination axis of the rectangular search
area. You will also have to fill in the Δ RA field.
Format:
Δ DEC: Integer degree
Example(s):
4
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Δ Radius:
Fill in the size of the search radius of a circular search area.
Format:
Δ Radius : Integer degree
Example(s):
5
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Batch processing:
The Archive Browser can also process a batch file containing request information.
You can upload the file by browsing your local environment and upload a text (!) file
to the server. The file can contain a number of record types: S (Source record types),
P (Project ID record types) and C (Coordinate record types). All three types can be
present together in the same file. The record type is indicated by the first character
of each line, followed by a space. The rest of the record depends on the type of
record. The record ends with a newline character.
Note 1: if a batch file is uploaded, the other input in the query-form is ignored.
The query will be composed only from the contents of the batch file.
Note 2: the C record only works with radius shaped areas (hence the delta radius, see
format).
Format:
The S-record: S <A Source code (object name)>
The P-record: P <A Project Code>/<A Project Number>
The C-record: C <J2000 right ascension (HH:MM:SS.ss)> <J2000 declination ([-]DD:MM:SS.ss)> <Δ Radius>
Example(s):
S 3C286
S V404CYG
S NGC 4013
P R*/5
C 11:22:33.44 -11:22:33.44 5
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