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1.3 Identifying Calibration Reference Files

StarView provides calibration reference file screens for each instrument. These screens let you see which calibration files and tables were used by pipeline processing to calibrate a given dataset at the time the data were taken, which calibration files and tables are currently recommended, and the degree to which the files used differ from the files recommended. You can mark either the used or the recommended reference files and tables for retrieval and retrieve them through StarView.

Note that you can retrieve the calibration reference files for your data very simply, either when you retrieve your data intially or later on, by searching and marking your data for retrieval and clicking on the "Best Reference Files" in the <Retrieval Request - File Options Screen>. (See Figure 1.7.)

In this example, we use a StarView reference file screen to display both the "used" and "recommended" calibration files for an M87 dataset.

From the <Welcome> Screen (Figure 1.3).

Click the [HST Instrument Searches] button.¹ (We want to find the search screen for calibration reference files.) The [HST Instrument Searches] screen will be displayed (Figure 1.12).
Click the [Reference] button on the WFPC2 line to display <WFPC2 Reference Files - Search Specification> screen.
Specify search criteria. We want to specify a particular dataset, so move the cursor to the "Dataset Name" field, then type the dataset name for the observation whose calibration files you desire. For example, enter U2900101T (see Figure 1.13).
Click on the [Begin Search] button to submit your catalog search request. The <WFPC2 Reference Files - Search Results> screen will be displayed for the observation that you specified (Figure 1.14).
Click [Mark USED Files for One Dataset] to mark for retrieval those calibration files actually used to calibrate the dataset. If the files listed in the RECOMMENDED column differ from those in the USED column, then you can click on [Mark RECOMMENDED for One Dataset] to retrieve the calibration files that are now recommended for calibrating the data.
Click the [Retrieve Marked Data] button to begin the retrieval process for the marked reference files. Continue with the data retrieval procedures as outlined in "Retrieving Datasets From the Archive" on page 1-12.

The defaults on the <Retrieval Request-File Option> screen, i.e., "Calibrated", will return the correct files for the specified calibration reference files and tables.

Figure 1.12: HST Instrument Searches Screen

Figure 1.13: WFPC Reference Files - Search Specification Screen (Constrained)

Figure 1.14: WFPC2 Reference Files - Search Results Screen

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¹ Users of the terminal version can use the accelerator E+2.

stevens@stsci.edu