SAS2MAPS Catalog
This database is a collection of maps created from the 28 SAS-2 observation
files. The original observation files can be accessed within BROWSE by
changing to the SAS2RAW database. For each of the SAS-2 observation files,
the analysis package FADMAP was run and the resulting maps, plus GIF images
created from these maps, were collected into this database. Each map is a
60 x 60 pixel FITS format image with 1 degree pixels. The user may
reconstruct any of these maps within the captive account by running
FADMAP from the command line after extracting a file from within the
SAS2RAW database.
The parameters used for selecting data for these product map files are
embedded keywords in the FITS maps themselves. These parameters are set
in FADMAP, and for the maps in this database are set as 'wide open' as
possible. That is, except for selecting on each of 3 energy ranges, all
other FADMAP parameters were set using broad criteria. To find more
information about how to run FADMAP on the raw event's file, the user
can access help files within the SAS2RAW database or can use the 'fhelp'
facility from the command line to gain information about FADMAP.
SAS2RAW Catalog
The SAS2RAW database is a log of the 28 SAS-2 observation intervals and
contains target names, sky coordinates start times and other information
for all 13056 photons detected by SAS-2. The original data came from
2 sources. The photon information was obtained from the Event Encyclopedia,
and the exposures were derived from the original "Orbit Attitude Live Time"
(OALT) tapes stored at NASA/GSFC. These data sets were combined into FITS
format images at HEASARC. The images were formed by making the center pixel
of a 512 x 512 pixel image correspond to the RA and DEC given in the
event file. Each photon's RA and DEC was converted to a relative pixel
in the image. This was done by using Aitoff projections. All the raw data
from the original SAS-2 binary data files are now stored in 28 FITS files.
These images can be accessed and plotted using XIMAGE and other columns of
the FITS file extensions can be plotted with the FTOOL FPLOT.
