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From: xyzhang@strw.leidenuniv.nl
Subject: Questions about bad pixels in exposure map
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Date: Wed, 23 Jan 2019 11:19:30 +0100
From: xyzhang@strw.leidenuniv.nl
To: xmmhelp@sciops.esa.int
Subject: Questions about bad pixels in exposure map
Full_Name: Xiaoyuan Zhang
Submission from: (NULL) (193.147.152.102)


I am analysing ID0604960701 data. When I extract a count map of PN CCD with
expression FLAG==0, there are significant non-zero flag pixel streaks. But in
the corresponding exposure map, only a few of them are shown. Is it because not
all non-zero flag pixel are bad pixels? In that case, how can I make an exposure
map only for FLAG==0 events?


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From: Nora Loiseau <xmmhelp@sciops.esa.int>
To: xyzhang@strw.leidenuniv.nl
Subject: Re: Questions about bad pixels in exposure map (PR#84559)
Date: Wed Jan 23 19:21:34 2019
Dear Dr. Zhang,
 
> 
> I am analysing ID0604960701 data. When I extract a count map of PN CCD
with
> expression FLAG==0, there are significant non-zero flag pixel streaks. But
in
> the corresponding exposure map, only a few of them are shown. Is it because
not
> all non-zero flag pixel are bad pixels? In that case, how can I make an
exposure
> map only for FLAG==0 events?
> 
Do you see these same streaks in the pipeline image files? I see that 
the full band EPIC-PN image P0604960701PNS003IMAGE_8000.FTZ   
looks quite clean. And the pipeline filters are less restrictive than FLAG==0

The Pipeline filters defined as #XMMEA_EP:
#XMMEA_EP includes  a selection of flags for PN:
    	                        INVALID_PATTERN
				CLOSE_TO_CCD_WINDOW
				ON_OFFSET_COLUMN
				NEXT_TO_OFFSET_COLUMN
				CLOSE_TO_ONBOARD_BADPIX
				CLOSE_TO_BRIGHTPIX
				CLOSE_TO_DEADPIX
				IN_SPOILED_FRAME
				OUT_OF_FOV
				
FLAG==0 rejects, in addition, events which are close to CCD gaps or bad pixels
				
Are you trying to produce images? did you have a look at the thread:
https://www.cosmos.esa.int/web/xmm-newton/sas-thread-images

Please send us the image with streaks that you obtained, with the log
of the SAS steps that you performed so we can try to reproduce your problem.

Best regards,

Nora
----
Dr. Nora Loiseau
XMM-Newton User Support Group

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