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Status of the EPIC long term cal plan
M.G.F. Kirsch
European Space Agency

Marcus G. F. Kirsch
XMM-Newton EPIC Page 1


current calibration situation

Effect
Astrometry PSF rel. effective area abs. effective area energy scale relative timing absolute timing cross cal RGS cross cal Chandra

max error
1-2 arcsec 2 % on axis +/- 5 % +/- 10 % +/- 10 eV < 3E-8 < 100 E-6 sec +/- 15 % +/- 20 %

status
done off axis pending ok
systematic low/high energy differences
for some modes NOT

done
done (some GS issues to be checked)

still time dep. effects

?
Marcus G. F. Kirsch
XMM-Newton EPIC Page 2


CAL campaign 2007

The EPIC consortium together with the XMM-SOC will start a major (cross)calibration campaign in order to try to resolve pending calibration issues and to bring the EPIC calibration to the next higher level of quality.

set of objectives local MOS and pn cal meetings be-weekly telecons
Marcus G. F. Kirsch
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objectives

· Objective O1: Solve flux discrepancies · Objective O2: Provide off axis calibration · Objective O3: Refine energy correction · Objective O4: Clarify timing situation · Objective O5: Calibrate slow slew mode · Objective O6: Calibrate MOS timing mode

Marcus G. F. Kirsch
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status of tasks-1
· Objective O1: Solve flux discrepancies ­ task O11: redistribution for line rich sources need to be checked and refined (main topic for January CAL WS) --> MOS CCF for redistribution for Off axis to be issued now --> pn work ongoing

­ task O12: for testing purposes MOS will provide a QE/redistribution fudge to be aligned with pn (SS by 31.12.2006) --> new qe file tested (QE 50) MOS now consistently ~ 7 % higher than pn ­ task O13: implement pn FIFO overflow correction (MJF, RS, EK, CCF by 15.01.2007, SW by end Feb 2007) ­ task O14: High energy flux lower than MOS, mirror measurements soon at PANTER (MJF, EK MID 2007) ­ task 015: Chandra XMM flux comparison (MS by 31.01.2007) DONE ­ task 016: IACHEC inputs on cross calibration (all) ­ taks 017: REFINE ON-AXIS PSF AT HIGH ENERGIES (AMR BY 31.02.2007)

Marcus G. F. Kirsch
XMM-Newton EPIC Page 5


status of tasks-2
· Objective O2: Provide off axis calibration ­ task O21: provide off axis PSF (AMR by 15.02.2007) ­ task O22: Spatial dependence of very low energy response of MOS ­ task O23: Spatial variation of low energy QE (SFS BY 31.03.2007) ­ task O24: Astrometry: possible residual in the position angle rotation (Euler ? angle) of the order of 0.1 deg. (considered to be low priority)

Marcus G. F. Kirsch
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status of tasks-3
· Objective O3: Refine energy correction ­ task O31: provide MOS column dependent CTI (DB, MST by 31.01.2007) ­ task O32: refine pn Timing Mode CTI/Gain (FH, MK by 31.12.2006) DONE ­ task O33: refine pn Burst Mode CTI/Gain (MK by 31.12.2006) DONE --> test FRAME NUMBER treatment versions in SAS (GS) ­ task O34: refine pn eFF Mode CTI/Gain (MK by 15.01.2007) DONE ­ task O35: implement temperature dependent CTI/Gain (KD, MK by 15.01.2007) --> observation needed --> value from CC is 0.43,, not confirmed by Eta Carinae (but doubtful obs) consistent with 1e0102 --> archive CAS should be check to available with different temperatures ­ TASK 036: REPORT ON MOS RATE DEPENDENT CTI EFFECT USING DEDICATED VELA DATA AND OTHER RELEVANT OBSERVATIONS (???) ­ task O37: Special CTI due to vent hole (KD report on next CAL meeting Palermo) ­ task O38: special CTI for various double events (KD ???) ­ task O39: refine pn Burst rate dependent CTI (FH via GS by 31.02.2007) ­ task o39b INVESTIGATE SMALL NUMBER OF MOS OBSERVATIONS WHICH SHOW GAIN SHIFTS (DB, MSt by 31.01.2007 --> TBD with MSt)
Marcus G. F. Kirsch
XMM-Newton EPIC Page 7


status of tasks-4
· Objective O4: Clarify timing situation ­ task O41: time jump detection refinement (MK, MJF, RS by 31.01.2007) ­ task O42: further investigation of pn absolute timing (systematic < 100 microsec) ­ task O43: MOS rel and absolute timing evaluation (MK after June 2007) · Objective O5: Calibrate slow slew mode ­ task O51: Vela PWN nebula observation of 50 ks to check QE/pattern setting for pn: SW medium filter · Objective O6: Calibrate MOS timing mode ­ task O61: calibrate "no gatti" effects (DB by 31.03. 2007) ­ task O62: provide statistics on flux instabilities (MST by 31.05. 2007) ­ task 063: Analyze MOS timing with respect to pn (MK by End 2007)

Marcus G. F. Kirsch
XMM-Newton EPIC Page 8


· 2007 (CAL accuracy 10 %)
­ cal campaign as described

future calibration issues and timescale

­ build up Suzaku cross cal + more CHANDRA cross cal

· 2008-2010 (Goal: Cal accuracy ~ statistical uncertainty)
­ pn new redistribution and rate dependent CTI --> deeper investigation and SAS development ­ MOS patch calibration currently rather crude --> deeper investigation and SAS development ­ full EPIC off axis calibration --> deeper investigation and SAS development ­ pn double effect behaviour + pn-vent hole effects --> deeper investigation and SAS development

sufficient expertise in SAS support in combination with calibration is needed at least till 2011 (ESAC: 2.5 FTE EPIC calibration + 1 FTE EPIC SAS)

· as of 2011
­ routine instrument monitoring (CTI, BAD PIX, offset) --> routine CAL updates (CTI, BAD PIX, offset) ­ contingency calibration....(if possible at all?)
Marcus G. F. Kirsch
XMM-Newton EPIC Page 9