About IMAPS Data
Currently, only the IMAPS-1 data is releaseable. IMAPS-2 was expected to become available but the data was never archived at MAST.
The original IMAPS data was stored as IDL unformatted data
sets. The raw data
was later converted to FITS format files by the staff members at the
ADF (see NSSDC).
The FITS headers were extensively modified by Goddard LASP personnel,
and the resulting raw image files are now available
via the WEB or anonymous FTP at archive.stsci.edu
IMAPS data sets are uniquely defined using the "Exposure Sequence Number". The first archived file is number 079 and the last image is number 721. The current naming convention is imaps1_0nnn.fits, where nnn is the exposure sequence number. The coadded files will use the naming convention imaps1_0nnn-0mmm.fits where nnn is the first coadded image and mmm is the last coadded image. (It is assumed that all intervening images are included in the coaddition.)
A table of the IMAPS1 observations (obtained from the EXPOLOG.DAT file written by Ed Jenkins) is shown below. The total integration time is an estimate for the total amount of observation time devoted to each object. The exposure sequence numbers describe the number and sequence of the individual observations. The numbers in parentheses indicate the number of frames used in the eta UMa exposures (511 frames were used for all others). Background exposures are not included in the table. in the table.
Spectral Resolution and SensitivityThe plot below shows the spectral sensitivity and resolution of IMAPS compared to other recent UV detectors (courtesy of Derck Massa, Raytheon STX, Goddard Space Flight Center).