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XMM-Newton Calibration - intro
· Briefly review the ground calibration · Highlight the unique calibration issues of XMMNewton · Review the life-cycle of calibration observations, analysis, and ingestion into SAS · The publication of calibration data and ensuring correct sets used in SAS

XMM-Newton
David Lumb --XMM-SOC 1


Original System Requirements
· Astrometry < 3 arcsec · Absolute effective area 10% · Relative effective area · Energy calibration: · OM photometry · OM astrometry 3%

(ca 1995)

3eV EPIC, better than 10m RGS 10 mMag 1 arcsec

it was said .... "No need to calibrate XMM on-ground ­ AXAF will be calibrated to 1% so just calibrate to them!"

XMM-Newton
David Lumb --XMM-SOC 2


Ground Calibration
· No end-to-end tests feasible with flight mirrors and instruments ­ develop physical models to be verified · Mirrors ­ not in parallel beam, entrance baffle not installed · EPIC CCDs and filters calibrated at the Orsay synchrotron (detection efficiency and redistribution) · RGS gratings and CCDs tested at synchrotron & with FM mirrors (but not in flight location) · OM ­ workmanship tests (some filter & flat field) XMM-Newton
David Lumb --XMM-SOC 3


Status at Launch & CAL/PV phase
· Late deliveries ­ PN FM had failed CCD ­ replaced with FS (physically different!); replaced CCDs in some of MOS & swapped one focal plane, OM began late replacement programme for mirrors - > limited test programme time (filters, stray light tests limited) · In-flight calibration programme planned in detail but not known if Ground Segment would support this ­ low early phase efficiency, need to develop functionality during nominal CAL programme (ODF availability, AHF missing, instrument anomalies etc..) · In-flight cal sources have limited energy leverage XMM-Newton
David Lumb --XMM-SOC 4


XMM ­ Unique features
· Large area - systematics revealed BEFORE other observatories ­ S:N pushes new physics models · Co-aligned instruments operating simultaneously ­ allows cross-check, BUT demands from observers that the cross-calibration is secure · Filter choices: EPIC (THIN/MEDIUM/THICK/CLOSED), OM multiple positions for filter photometry · Instrument modes: different modes for count rate optimisation : EPIC IMAGING/WINDOW/TIMING/OFF modes , OM fast, windows
Guess which modes and filters are now calibrated!

XMM-Newton
David Lumb --XMM-SOC 5


Calibration life cycle
· Routine & periodic calibrations to check stability of gain, wavelength scale, CTI, astrometry · Define non-routine observations to investigate anomalies (planning cycle a limit to speed of implementation) · ODF available ~1 month - instrument teams analyse data · Define new SAS interfaces, CAL? New tasks and testing · Supported by SOC team who man Help Desk and enter the CCF files and generate the Release Notes XMM-Newton
David Lumb --XMM-SOC 6


CCF

(Current Calibration File)

· Release notes are published with each new CCF set to explain what changed and science impact · CALVIEW task used to plot out and export data as interpreted by SAS Calibration Access Layer calls · CIFBUILD ­ ensure to run this task to get complete new CCF set aligned for reprocessing · Can also run individual tasks with ­ -ccffiles" option
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· Subscribe to the calibration mailing list for prompt update XMM-Newton
David Lumb --XMM-SOC 7


Introduction to remainder of talks
· Instrument overviews of current status · Cross calibration between EPICs · Cross calibration EPIC ­ RGS · Cross calibration XMM to other observatories · Mainly a review of current best knowledge, not all currently in SAS · Posters include many details as focus for discussion · Ask the experts here ! XMM-Newton
David Lumb --XMM-SOC 8