Thalhammer: /* Chandra */

2025-03-06T17:03:04Z

Chandra

Thalhammer: /* Chandra */

2025-03-06T17:02:40Z

Chandra

Ballhausen at 11:50, 11 April 2018

2018-04-11T11:50:43Z

Ballhausen: Created page with " Category:Data Extraction ====== Chandra ====== ===== HETG ===== As of Aug 2014, the old Chandra HETG extraction scripts by Manfred are deprecated. They were good for..."

2018-04-11T11:36:49Z

Created page with " Category:Data Extraction ====== Chandra ====== ===== HETG ===== As of Aug 2014, the old Chandra HETG extraction scripts by Manfred are deprecated. They were good for..."

New page

[[Category:Data Extraction]]

====== Chandra ======

===== HETG =====

As of Aug 2014, the old Chandra HETG extraction scripts by Manfred are deprecated. They were good for Ciao Versions up to 4.2. Ciao 4.3 already has a bug that does not cause error messages with this script but whose bug fix is not implemented. On top of that a lot has changed. We have newer extraction scripts working with Ciao-4.6 that should be much easier to maintain with future changes to data preparation with Ciao, as the data preparation is now based on ''chandra_repro''.

Data preparation and data extraction are two separate steps, i.e., the data only needs to be prepared / reprocessed once (making sure the newest and most appropriate CALDB information is used for each observation), but then can be used for extration of spectra, lightcurves, and images multiple times, e.g., with different GTIs. The scripts can be found at:
<code>
/data/system/software/scripts/chandrascripts/
</code>
and are called ''chandraprepare'' and ''gratingsextract''. Calling the scripts with no option or with ''--help'' will print a description of available options / arguments to STDOUT.

==== Caveats ====
<code>
The scripts currently have issues with data in CC mode.
</code>

<code>
If there are multiple event1 files in the archive directory, the script will exit with a warning.
</code>
Correct use of multi-event1 file observation is pending implementation. Talk to the Remeis Chandra-point of contact.

==== chandraprepare ====
Example bash script to call chandraprepare (update the Ciao version if applicable):
<pre>
#!/bin/bash

. /data/system/software/chandra/ciao-4.6/ciao-4.6/bin/ciao.bash

export CHANDRATOOLS=/data/system/software/scripts/chandrascripts

chandraprepare=${CHANDRATOOLS}/chandraprepare

cdata=/eu/X-ray/Chandra/archive/${obsid}/
obsid=1600
datadir=${cdata}/${obsid}

${chandraprepare} --datadir=${datadir} --prepdir=test${obsid}
</pre>

==== gratingsextract ====
Example bash script to call gratingsextract (update the Ciao version if applicable):
<pre>
#!/bin/bash

. /data/system/software/chandra/ciao-4.6/ciao-4.6/bin/ciao.bash

export CHANDRATOOLS=/data/system/software/scripts/chandrascripts

extract=${CHANDRATOOLS}/gratingsextract

obsid=1600
name=full

${extract} --prepdir=${obsid} --name=${name} --heg --meg --order=-1,1 --dt=25.5 --energyband=500,1500,3000,10000
</pre>

==== Loading data in ISIS ====
The above scripts create individual files for each arm/order, even for lightcurves. While the old Manfred-scripts wrote loadscripts to ease loading the data in ISIS, the new script do not provide ''loaddata.sl'' scripts anymore. The naming scheme for the extracted data changed slightly and is now generic enough to allow for common load functions for HETG data. Talk to Natalie for functions that easily load spectral data (preserving the order established by the old extraction scripts to allow for compatibility with old isis ''par'' files), individual lightcurves and the sum over lightcurves.

Eventually, these function will make it into the ''isisscripts''.

----

===== LETG =====

Theoretically, the new scripts described above can handle LETG observations. However, this is largely untested.

----

===== ACIS-I =====
Global scripts are yet missing.

@@ Line 1: / Line 1: @@
 ====== Chandra ======
-If you run into errors, try and unload HEASoft.
+Generally, if you run into errors, try and unload HEASoft.
 ===== HETG =====

← Older revision		Revision as of 17:02, 6 March 2025
Line 1:		Line 1:
	====== Chandra ======		====== Chandra ======
		+
		+	If you run into errors, try and unload HEASoft.

	===== HETG =====		===== HETG =====

@@ Line 1: / Line 1: @@
 ====== Chandra ======
@@ Line 78: / Line 74: @@
 ===== ACIS-I =====
 Global scripts are yet missing.

Chandra - Revision history

Thalhammer: /* Chandra */

Thalhammer: /* Chandra */

Ballhausen at 11:50, 11 April 2018

Ballhausen: Created page with " Category:Data Extraction ====== Chandra ====== ===== HETG ===== As of Aug 2014, the old Chandra HETG extraction scripts by Manfred are deprecated. They were good for..."