Retrieve module pointing

[matteani]

Hi everyone,

I was able to find the mean/median (?) pointing information of the instrument in the eROSITA FITS file for a EDR dataset.
Where can I find the module specific pointing information (e.g. the module-specific deviation from the mean/median specified in the EVENTS file)?

Thank you very much.

All the best,
Matteo

[MiriamRamos]

Dear Matteo,

The information you are looking for can be found in the CORRATTx extensions of the event file. This will give you the pointing direction for each telescope module (TM).

Best wishes,

Miriam

[matteani]

Dear Miriam,

Thank you for your answer. Unfortunately, I still have some additional questions.
I am looking at EDR data, specifically at the LMC_SN1987A dataset (but I have observed the same also with eFEDS).
When I look into the CORATTx extensions of the data files (e.g. pm00_700161_020_EventList_c001.fits), I notice that all modules have the same pointing. For instance, for the aforementioned dataset, I get:

Code: Select all

EXTNAME   RA_PNT    DEC_PNT
CORRATT1: 83.836375 -69.311388888889
CORRATT2: 83.836375 -69.311388888889
CORRATT3: 83.836375 -69.311388888889
CORRATT4: 83.836375 -69.311388888889
CORRATT5: 83.836375 -69.311388888889
CORRATT6: 83.836375 -69.311388888889
CORRATT7: 83.836375 -69.311388888889

It seems a bit weird to me that all modules are pointing at the exact same location. Is this correct? Am I looking at the correct thing?
Is some kind of module average performed? If so, is it possible to retrieve the individual pointings?

Thank you very much.

Best,
Matteo

[MiriamRamos]

Dear Matteo,

You are looking at the header keywords in the CORRATT extensions, right? The RA_PNT and DEC_PNT header keywords are the scheduled pointing direction. If you open the CORRATT extensions, you will have a column for RA and a column for DEC of where each telescope module was pointing.

Best wishes,

Miriam

[matteani]

Dear Miriam,

Thank you for your answer, this is what I needed.

All the best,
Matteo