How to exclude regions when filtering

[xPecax]

Hello everyone,

I am trying to filter the eFEDS event files using the following basic expression:

Code: Select all

evtool eventfiles="fm00_300007_020_EventList_c001.fits" outfile="fm00_300007_020_EventList_c001_filtered.fits" 
region="ds9.reg"

The ds9.reg file is a simple circle:

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# Region file format: DS9 version 4.1
global color=green dashlist=8 3 width=1 font="helvetica 10 normal roman" select=1 highlite=1 dash=0 fixed=0 edit=1 move=1 delete=1 include=1 source=1
fk5
circle(8:41:45.8382,+2:36:36.253,2570.572")

And the task works. However, I would like to exclude the `ds9.reg` instead of excluding everything outside it. Basically, I want a hole in the region position. In DS9 this is done by simply adding a minus before the expression, like:

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-circle(8:41:45.8382,+2:36:36.253,2570.572")

But this does not work with `evtool`, and the final product is a black fits file when opened with DS9.

Any suggestion?

[MiriamRamos]

Hello,

At the present, you can not do that with evtool. We hope that that feature will be included in the future. You could use some ftools or the xmm/chandra package for achieving what you want.

Best wishes,
Miriam