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35.3 Paper Products

The term "paper products" refers to the package of text and graphical information that can be generated, for example, for a visit's worth of GHRS data1. The GHRS paper products have been automatically generated as part of the RSDP pipeline process since September, 1996. Also, a task can now be run on any HST data by using pp_dads which is in the hst_calib.paperprod package. Refer to the help file for information on how to run this task. It is often useful to inspect the paper products to obtain a quick overview of data you have retrieved from the Archive.

The GHRS paper products produce title pages for an observation and a one-page summary for each rootname (excluding DEFCALs, which are deflection calibrations) in an observation. The page is divided into quadrants: summaries of the observation, the calibration, the image statistics, and OMS (or jitter) data. Quadrants may contain different information depending on the type of file being displayed.

An example of GHRS paper products is shown below for reference to these remarks (see Figure 35.1 through Figure 35.4). We have not included the title page to save space, but we show an LSA acquisition and an SSA peakup so that you can see an example of both.

35.3.1 Title Pages

The first page produced by pp_dads is a page which lists the proposal number and the name of the Principal Investigator. The next page(s) contains a list of targets for the observations and a list of the observations, similar to the exposure logsheet.

35.3.2 The Observation Summary

A separate sheet is produced for each individual exposure. The Observation Summary in the upper left quadrant contains information from keywords which characterize an exposure, such as the proposal ID, instrument, target and its location, grating, observation mode, exposure time, wavelength information, etc. The information for target acquisitions or images will be slightly different from science observations. For instance, target acquisitions will list the settings of the return-to-brightest indicator (RTBRIGHT) or the bright and faint limits, the size of the spiral search (SRCHSIZE), the highest flux in an RTB acquisition (FLUXFND), and the total flux on the eight target acquisition diodes at the end of the acquisition (ZFLUXM). At the bottom of the quadrant, the number of groups for the image displayed in the quadrant below (Image Statistics Summary) is listed.

35.3.3 The Calibration Summary

The Calibration Summary (upper right quadrant) will be blank for target acquisitions and images. For data that are calibrated, it will contain a list of the calibration images and tables, on the right; and a list of all the calibration switch settings, on the left. Two new additions (SAAHFILE and CCRE) to the headers, if added during any eventual reprocessing, may not show up in this section, since they were added after the paper products task was created. This quadrant also contains the "instrument: rootname" label for the observation being summarized on this sheet.

Figure 35.1: Target and Observation List

Figure 35.2: Observation Summary-LSA Acquisition

Figure 35.3: Observation Summary-SSA Peakup

Figure 35.4: Observation, Calibration, Image, and OMS Summaries

35.3.4 The Image Statistics Summary

The first thing you will notice in the Image Statistics Summary (lower left quadrant) for calibrated data is the plot of flux versus wavelength. Most data are coadded for this plot; the number of groups corresponding to the output display is printed at the bottom of the Observation Summary quadrant. At the top of the plot, image statistics for this observation are found, including the number of pixels, mean and mid-point (similar to a median; see the imstat help file), standard deviation, minimum and maximum. For RTB target acquisitions and SSA ACQ/PEAKUPs, there is a greyscale representation of the spiral search. Images will also be displayed in this quadrant.

35.3.5 The OMS Summary

The lower right corner contains the OMS (Observatory Monitoring System) Summary. Here you will find, if the information is available, the jitter plot (jitter ball) which shows the movement of the HST in V2 and V3 coordinates measured in arcseconds off center. The plot is made to be about the size of the Small Science Aperture (SSA), i.e., 0.25 arcsec on each side, unless the observation is a target acquisition in which case the full resolution of the spiral search is shown (3 x 3 or 5 x 5). Also listed is a summary of the rms jitter in V2 and V3 in milliarcsec, in addition to the number of recenterings and losses of lock during the observation. More information about OMS engineering data is available in Appendix C of -Volume I of this handbook.

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1 A visit is the sequence of observations obtained on a single target during one continuous use of HST.

Copyright © 1997, Association of Universities for Research in Astronomy. All rights reserved. Last updated: 01/14/98 15:45:39