long term epic in-orbit calibration plan

Marcus Kirsch, Marcus Kirsch, XMM-Newton XMM-Newton European Space Astronomy CenterEuropean Space Astronomy Center

EPICEPICESACESAC

Long term EPIC in-orbit calibration plan Long term EPIC in-orbit calibration plan

Marcus G. F. KirschMarcus G. F. Kirsch


EPICEPICESACESACCurrent situationCurrent situation

CALCLOSED CALCLOSED every 5.4 revsevery 5.4 revs

Targetes: Targetes:

– 1E0102 (2/year 30 ks)1E0102 (2/year 30 ks)– N132D (2/year 30 ks)N132D (2/year 30 ks)

– RXJ1856 (2/year 35 ks)RXJ1856 (2/year 35 ks)

– Crab (2/year 15 ks)Crab (2/year 15 ks)

– PKS2155 (1/year 30 ks)PKS2155 (1/year 30 ks)

Planned CALCLOSED observations in 1st half of 2005: every 5,4 revolution

0102030405060

925 935 945 955 965 975 985 995 1005

1015

Revolution

ksec

- gain monitoring- CTI determination

- gain monitoring- CTI determination- flux stability

- low energy flux stability

- timing

- Chandra cross cal

550 ks ~ 2 % of XMM time

250 ks (+100 ks OH) ~ 1.5 % of XMM time+ NRCOs+ NRCOs


EPICEPICESACESACfuture CALCLOSED strategyfuture CALCLOSED strategy

Meeting: 05-11-2004 to evaluate the the Meeting: 05-11-2004 to evaluate the the possibility of using slews for CALCLOSEDpossibility of using slews for CALCLOSED

Decision:Decision:– period of 2 months to perform slews in CALCLSOEDperiod of 2 months to perform slews in CALCLSOED– Until a decision is taken about any modified approach Until a decision is taken about any modified approach

ALL CALCLOSED currently mandated for execution in the ALL CALCLOSED currently mandated for execution in the Science Window will continue to be executed nominally.Science Window will continue to be executed nominally.

– Even when we have determined a new scenario we will Even when we have determined a new scenario we will need the current and future CALCLOSED strategies need the current and future CALCLOSED strategies running in parallel for some months of evaluation.running in parallel for some months of evaluation.

test period still runningtest period still running data need to be evaluateddata need to be evaluated


EPICEPICESACESACCALCLOSED test periodCALCLOSED test period

Use all slews longer than 15 minUse all slews longer than 15 min On average: On average:

– MOS: 4 ks/revolution in FFMOS: 4 ks/revolution in FF 740 ks per year 740 ks per year

– pn: more often different modes from FF are pn: more often different modes from FF are used: 2.5 ks/revolution in FFused: 2.5 ks/revolution in FF 450 ks per year 450 ks per year


EPICEPICESACESACfuture CAL-target strategyfuture CAL-target strategy

many variations in setting to establish calibration many variations in setting to establish calibration of different modes/filters etc.of different modes/filters etc.lag of a profound set of reference lag of a profound set of reference measurements with exactly the same settingmeasurements with exactly the same setting

IT IS NOT TO LATE …IT IS NOT TO LATE … establish for the coming XMM years a basic set of establish for the coming XMM years a basic set of

NOT changing observations that guarantee NOT changing observations that guarantee tracking of possibletracking of possible– contaminationcontamination– redistribution changesredistribution changes– all we can think of all we can think of

perform in addition calibration observations for perform in addition calibration observations for special calibration issues special calibration issues


EPICEPICESACESACfuture possible situationfuture possible situation

CALCLOSEDCALCLOSED– MOS using slewsMOS using slews– pn and MOS: parasitically long calclosed on RGS cal pn and MOS: parasitically long calclosed on RGS cal

targets (every 2 month)targets (every 2 month)– no dedicated CALCLOSED ????no dedicated CALCLOSED ????

Targets with Targets with FIXED settingFIXED setting: :

– 1E0102 (2/year 30 ks) TBD1E0102 (2/year 30 ks) TBD SW thin, SW mediumSW thin, SW medium– N132D (1/year 30 ks): N132D (1/year 30 ks):

SW thin, re-center to SW pn, MOS in LWSW thin, re-center to SW pn, MOS in LW– Vela FF thin 60 ks (1/year)Vela FF thin 60 ks (1/year)– Tycho 1 per year TBD 30 ksTycho 1 per year TBD 30 ks

SNRs always same Roll angle, same time of the yearSNRs always same Roll angle, same time of the year

– RXJ1856 (2/year 35 ks): RXJ1856 (2/year 35 ks): SW thinSW thin

– Zeta puppis SW thick(RGS target)Zeta puppis SW thick(RGS target)

– Crab (2/year 15 ks): Crab (2/year 15 ks): Burst/Timing/Burst thick filterBurst/Timing/Burst thick filter

– PKS2155 SW medium (1/year 30 ks)PKS2155 SW medium (1/year 30 ks)

- gain monitoring- CTI determination

- low energy flux stability

- timing- flux stability thick filter

- flux/gain stability

- redistribution

- Chandra cross cal

0 ks

+ NRCOs (+ NRCOs (H1426 1 per year with Chandra 90 ks)

310 ks (+130 ks OH) < 2 % of XMM time

long term epic in-orbit calibration plan

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