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ASCA Data Products from ARNIE | There
are a number of data files, images, help files and calibration files associated
with each observation in the ASCA archive. These files are available via ARNIE,
the LEDAS WWW database query interface. This page describes the layout of the
ARNIE results pages for a query of the ASCAPUB
database and how the data products can be obtained. For details of the contents
of the individual files themselves, see the file-by-file
guide to ASCA data products. The "Results of ASCA Database Search" Page
After a successful query of the ASCAPUB database, the user is presented with a
summary of the search criteria, the number of entries that match the criteria
and a results table displaying the subsample obtained: 
Three sets of data products are available from this page; the UNScreened
data files, the SCReened data files and the
AUXiliary files. For each observation there are a
large number of these files available, so to make downloading easier for the user
these files have been collected into three tar archives. This is a convenient
format for the event files in particular because most users will need to download
all of the screened/unscreened files, rather than just a subset. These
data are stored in our near-line CD-ROM jukebox system. To request a given product
for one of the observations shown, select the relevant checkbox (UNS/SCR/AUX)
at the left, fill in your e-mail address in one of the spaces provided and click
on the "Submit" button next to it. Of course, you can select more than
one checkbox at a time and thereby request multiple products at once. A convenient
way to request the bulk of the products is to select the yellow "Invert Selection"
checkbox, which applies a logical "NOT" to the individual checkboxes for that
column. You will shortly receive an e-mail confirmation when your data
has been copied from the CD-ROM to our anonymous ftp area (this message also includes
instructions on how to retrieve your data). The "On-line Data Products"
Page Clicking on the "Products" button corresponding to one of
the table entries takes the user to a page of on-line data products for that database:
This page provides access to all the ASCA data products for that
observation which are kept on hard disk at LEDAS. For a typical ASCA archive entry,
this will be a set of seven HTML help pages, two
broad-band sky images in GIF format, six FITS format
sky images in three bands, and two FITS format
exposure maps. - The HTML files can
be browsed immediately; a link is given to the top level (home) page of the help
information, from which all the subsidiary pages can be accessed. If users require
a complete set of the HTML files, these can be downloaded as a tar file
using the command-line BROWSE interface.
- The GIF images can be viewed directly over the WWW in the user's browser.
- The FITS files must be copied to the user's own diskspace and then viewed
either with the
XANADU suite of software or the FTOOLS
software package. To download a FITS file, press the shift key and simultaneously
click the left mouse button on the required file.
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