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From: ameer@science.uva.nl
Subject: Is it possible that emproc find badcolumns in case of heavy pile-up?
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Private message: yes  no

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Date: Wed, 4 Sep 2002 13:16:06 GMT
From: ameer@science.uva.nl
To: xmmhelp@xmm.vilspa.esa.es
Subject: Is it possible that emproc find badcolumns in case of heavy pile-up?
Name: Arjen van der Meer

Email_Address: ameer@science.uva.nl

Topic: tasks

Other_Topic: 

Usage_Mode: command line

SAS_Release: xmmsas_20020605_1701 - aka 5.3.3

Task_Version: 

Type: report a nuisance

Title: Is it possible that emproc find badcolumns in case of heavy pile-up?

Description: Dear XMMhelp,

Running emproc in the default mode (i.e. searchforbadcolumns=yes) gives for one
of my observations a lot of dark colums while checking the image.
searchforbadcolums=no gives a good image.

The data however has a lot of pile-up. Is it possible that the algorithm
searching for bad columns gets confused by this?
If, with the eye, there seem to be no strange columns with
searchforbadcolumns=no, is it save to assume there are indeed no badcolumns?

Cheers Arjen

Operating_System: RedHat 7.x

Other_Operating_System: 

Instrument: emos2

Data_Type: imaging

Observation_Identifier: 0219_0083280201

Exposure_Identifier: 

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Reply 1

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From: Rosario Gonzalez Riestra <xmmhelp@xmm.vilspa.esa.es>
To: ameer@science.uva.nl
Subject: Re: Is it possible that emproc find badcolumns in case of heavy pile-up? (PR#5845)
Date: Fri Sep  6 12:18:35 2002
Dear Arjen,

According to the EPIC calibration scientist, pile-up does not increase the
number of bad columns.

In your observation, the task "badpixfind" - which is called by emproc -
identifies four columns (at RAWX 297,298, 305 and 307) as "hot".

Please refer to the task documentation for more details and for comments about
its use made by the developers.

As you can see there, the default parameters are a "best guess" and might not
be
applicable to all the observations and may require some fine-tuning . 
It is also possible that a full column is flagged because of a few pixels.

Regards,

			Rosario
			

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