Whats coords channel mod12/11/2023 ![]() Which enclose as much of the total PSF as possible The intrinsic PSF of the GIS depends on energy.Īnd 10 keV (the effective bounds of the GIS pass band) is 2 and 0.4Īrcmin, respectively.Should be no smaller than 3 arcmin (12 pixels for the GIS Spurious variability in light curves, the radius of the region filter ![]() Thus, to avoid inaccurate flux determinations and Because of the broad PSF, the jittering of the spacecraft can appear onĪrcminute scales.Image by a factor of four, i.e., xybinsize When an SIS image is extracted in XSELECT, Response matrices is limited (see also § 10.6).Ĭircular region filters will yield the most accurate spectral fittingĬase for GIS PH mode with standard bit assignments. Although the XRT PSF has considerable azimuthal structure, the.When creating a region filter, please consider the Will erase the saved regions, allowing you to start again beforeĪfter it is created, a region filter file is applied with the filterĬommand followed by the name of the region file. The region file when you hit the write button. That you can build up quite complicated regions by drawing multiple Finally, hit the write button, as before. Then, size the inner circle and type eĮxclusionary region. To create an annular region, first position and size the outer circleĪnd type s. Prompt give the filename (e.g., source_gis2.reg) for the region Positioned and sized the region according to your wishes, type s Region, and the right button changes the orientation. The center of the region, the middle button changes the size of the Then manipulate the region using the cursor. To define the region, click on the circle button and There are two sets of cursor buttonsĪvailable - toggle between them using the region button at the Change the appearance of the plot, if you like, using the Scale,.Plot the image with the plot image command which invokes.Extract an image from your screened events with the extract.SKY, use the XSELECT command set image sky. Using SKY coordinates can give you an incorrectĮspecially when attitude excursions are large.Įxtraction regions from other missions. Since the spectral response depends on the location in detector Decide first whether you want to work in SKY coordinates orįor spectra work it is strongly advised to use.To create region filters in XSELECT, execute Points to be borne in mind when creating region filters for the GIS and SIS.ħ.3.1 Using SAOimage to Create Region Filters The procedure is straightforward, but there are a few In XSELECT, region filters are usually created by examining an extracted Is a useful precaution to take before extracting anything. To check what filters are in place, use the show filters.Recently entered region filter, while clear region all To remove a filter, use the clear command.Intensity filter, all three filters will be applied when you next ForĮxample, if you set a region filter, then a time filter, then an Multiple filters entered successively are applied together.Rather,įilters are applied when the extract command is next used. ![]()
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