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Direct your browser to https://mast.stsci.edu/ to use the MAST Por= tal web application. The Portal graphical user interface (GUI) is annotated= in Fig. 1 and described in the following sub-sections.
Figure 1 =E2=80=94 The MAST Portal web application, sho= wing the main components (after a successful search) with shaded/numbered b= oxes: the Search= Panel (1: top), the Search Status and Action Bar<= /em> (2: second from top, left); the Filters Panel= (3: left), the Search Results Table= (4: center), and the AstroView Tool (5: right).
The Search Panel is the only panel visible at the beginning of a session= , apart from a Home Page with status information, until a successful search= is executed.
<= /p>
The set of data collections available via the Portal is listed in the co= llection pull-down menu at upper left. The most often used is searching for= a target by name or coordinates, which is described in Basic Search.
Targets may be searched by name or by celestial coordinates. Note that t= he search radius may optionally be specified. The allowed formats for targe= t name and for coordinate syntax are described in Basic Search.
Click the Search button to execute the search, or the Advanced Search text to refine the search.
A list of targets, including a name and the celestial coordinates, one p= er row, may be uploaded to the results grid. You can then cross-correlate t= hem with MAST holdings all at once, as explained in Special Searc= hes.
The My Download Basket button displays the current numb= er of files in the Basket; click it to bring up the Downlo= ad Manager. Two shortcuts to download manager functiona= lity are available in the search panel: clear the download basket of all co= ntents, and (if you are logged in) bring up your download history.
=
At the far right of the search panel you can log in. If you are logged i=
n you may subscribe to notifications about the status of programs (e.g., whe=
n the data become public, or have been reprocessed) by clicking the
The results of each search are preserved during a Portal session. View e= ach search by clicking the tab at the top of the search results panel. The = footprints from all searches will appear in AstroView.
If the search is successful, the number of matching records, the (resolv= ed) target name, the target coordinates (if the target name in the action b= ar is clicked), and the search radius will be displayed in the status area = above the results table. Buttons in the Action Bar (to the right) provide additional functionality, as described in Search Results Grid.
The Filters Panel enables a finer selection of matching= observations using values or ranges of select metadata.
These metadata are identical in function to those available in the Advanced Search= a> window (see the descriptions of filter types in the Filters Panel section). This panel may be hidden by clicking the left double arrow = (). Each filter can be hidden or unhidd= en by either clicking Edit Fil= ters at the top, or clicking up/down arrows next to each fi= lter name.
The Keyword/Text Filter dialog near the top searches ov= er all metadata values (including some values hidden from the user), and ac= cepts case-insensitive regular expressions in Javascript format (see the w3schools definition of the RegExp object).= For example:
ngc=
em>
will match all records containing the string "ngc"
ngc|m101
=
will find "ngc" or "m101"<=
br>odk369=
fdq
will find this HST program identifierObservations in MAST that match the search criteria, as modified by the = selections in the Filters Panel, are presented in a table,= like the one below.
User-facing metadata for the observations are presented in separate colu=
mns; you may show or hide individual columns by clicking the Edit Columns... text and che=
cking boxes next to the column names of interest. These choices will persis=
t for the duration of your Portal session. Preview images will be displayed=
(if available, as they are in the figure) for each row by checking the
Preview images are not produced for certain types of data (e.g., long-sl= it spectra). Previews will not be displayed for Exclusive Access data excep= t for authorized users.
The AstroView Tool displays a region of a (selectable) = sky survey centered on the coordinates of the target. The tool may be hidde= n by clicking the double-right arrow
The advanced search window provides a way to fine-tune a search using ad= ditional metadata, as shown in Fig. 2 below. Access this from the main Port= al GUI by clicking the Advanced Search text.
Figure 2 =E2=80=94 The Advanced Search GUI<= /strong> consists of metadata filters which may be used to constrain t= he search results. The number of matches to observations with the applied f= ilters is displayed (1: top), the Applied Filters Panel displays the names and values (2: second from top), the ava= ilable filter Columns Panel (3: lower left), and = the selected Filter dialogs (4: lower right).
Only a few MAST collections support an advanced search option.
The main elements of the advanced search are listed below, and explained= in detail on the Advanced Se= arch page.
Clicking the basket icon will add one or mo= re selected observations to the basket and bring up the Download Ma= nager window. This GUI shows all files that are associated with ea= ch observation and provides various tools for selecting files of interest, = and provides multiple methods to download the selected files. See the Download Basket page for detai= ls.
Figure 3 =E2=80=94 The Download Manager GUI, with compo= nents denoted with shaded boxes: an Action Bar (1: top= ), a Filters Panel (2: left), a File= Selector Panel (3: center), and a file Details P= anel (4: right). A history of your download activity (if = you were logged in) may be viewed by clicking the Download History<= /strong> tab (upper left).