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EPIC-pn Timing Mode calibration status
Matteo Guainazzi1, Frank Haberl2, Benjamin Mck3, Konrad Dennerl2, Michael Freyberg2, Michael Smith1
1

ESA-ESAC, Villafranca del Castillo; 2MPE, Garching;
3

University of Tbingen


Community issues

The count rate pile-up threshold is lower than reported in the User's documents (800 cts/s) The instrumental edges are badly calibrated The energy-scale correction embedded in epfast ("Rate-Dependent CTI", RDCTI) is wrong Systematic soft excesses in different X-ray obscured astrophysical sources Systematic X-Ray Loading (XRL):
(Guainazzi et al., 2012, XMM-SOC-CAL-TN-0083)

full re-calibration of the mode

EPIC-pn Timing Mode calibration status | Matteo Guainazzi et al. | EPIC-BOC | Leicester, 6/3/2012 |


Pile-up

EPIC-pn Timing Mode calibration status | Matteo Guainazzi et al. | EPIC-BOC | Leicester, 6/3/2012 |

(Guainazzi et al., 2012, XMM-SOC-CAL-TN-0083)


Energy reconstruction accuracy

EPIC-pn Timing Mode calibration status | Matteo Guainazzi et al. | EPIC-BOC | Leicester, 6/3/2012 |

(Guainazzi et al., 2012, XMM-SOC-CAL-TN-0083)


Instrumental edges modeling

EPIC-pn Timing Mode calibration status | Matteo Guainazzi et al. | EPIC-BOC | Leicester, 6/3/2012 |

(Guainazzi et al., 2012, XMM-SOC-CAL-TN-0083)


Spectral impact of XRL
· NRCO#83 (September 2011): two observations of the Crab Nebula ­ one with the offset map in THICK filter (XRL), the other with the offset map in CLOSED filter (no XRL) · One spectrum extracted for each of the 15 columns around the boresight (included) · PHA: the shift (in PHA space) to re-align the XRL'd to the no-XRL'd spectrum · Results consistent with the expected behaviour Decisions: · epreject (as of SASv12) applies the XRL correction to the PHA event values · New EPN_CTI CCF extension with the linear coefficients (a,b) of the: PHA=a+bXRL relation (currently: a=0; b=1) · Reference CLOSED offset maps in extensions of the EPN_REJECT CCF · Operational change: offset maps calculated in CLOSED filter (for both Burst and Timing Mode) as of the public release of SASv12

EPIC-pn Timing Mode calibration status | Matteo Guainazzi et al. | EPIC-BOC | Leicester, 6/3/2012 |

(Guainazzi & Smith, XMM-CAL-TN-0094)


RDCTI in the post-XRL era

(i.e., public RDCTI calibration)

EPIC-pn Timing Mode calibration status | Matteo Guainazzi et al. | EPIC-BOC | Leicester, 6/3/2012 |


NRCO#85: 1E0102-72
(against the IACHEC model)
(Guainazzi et al., 2012, XMM-SOC-CAL-TN-0083)

SW
1.38 (-7%) 1.380 (-0.6%) 4.39 (+4%) 1.31 (-7%)

EPIC-pn Timing Mode calibration status | Matteo Guainazzi et al. | EPIC-BOC | Leicester, 6/3/2012 |


Recalibration of the "special gain correction"

EPIC-pn Timing Mode calibration status | Matteo Guainazzi et al. | EPIC-BOC | Leicester, 6/3/2012 |

(Guainazzi & Smith, XMM-CAL-TN-0096)


Recalibration of the "special gain correction"

EPIC-pn Timing Mode calibration status | Matteo Guainazzi et al. | EPIC-BOC | Leicester, 6/3/2012 |

Extrapolation above 2 keV largely different between public and new NRCO#87: Mkn3

(Guainazzi & Smith, XMM-CAL-TN-0096)


Recalibration of the "special gain correction"

?

EPIC-pn Timing Mode calibration status | Matteo Guainazzi et al. | EPIC-BOC | Leicester, 6/3/2012 |

Extrapolation above 2 keV largely different between public and new NRCO#87: Mkn3

(Guainazzi & Smith, XMM-CAL-TN-0096)


1E0102-72: Timing versus Small Window

EPIC-pn Timing Mode calibration status | Matteo Guainazzi et al. | EPIC-BOC | Leicester, 6/3/2012 |

(Guainazzi & Smith, XMM-CAL-TN-0096)


Blank fields - concept
Problem: the field-of-view in EPIC-pn fast modes is too small (and the sources often too bright) for a meaningful source photons free region to be available for background extraction This may lead to big uncertainties, especially in obscured X-ray binaries (e.g.: Ng et al., 2010, A&A, 522, 96) Solution: EPIC-pn Timing Mode blank fields Study done by Benjamin Mck · 30 observations identified as bona fide blank fields on the basis of the RAWX profile · "Contamination" from residual weak sources removed through simultaneous MOS exposure in imaging modes · Resulting spectra studied as a function of the position (in Galactic coordinates) and radiation level (as measured by the RGS background counts)
RAWX RAWX

RAWY

RAWY

T h is i s n o t a bl an k f ie ld

Th i s i s (potentially) a bl an k f ie ld

EPIC-pn Timing Mode calibration status | Matteo Guainazzi et al. | EPIC-BOC | Leicester, 6/3/2012 |


Blank fields - results

EPIC-pn Timing Mode calibration status | Matteo Guainazzi et al. | EPIC-BOC | Leicester, 6/3/2012 |


Summary of present and future activities
SASv12 · Implementation of the XRL correction (epreject/EPN_CTI/EPN_REJECT) · Update of the special timing mode gain correction (EPN_CTI:TIMING_GAIN) · Calculation of offset maps with the CLOSED filter (Burst and Timing Mode alike) · Testing and delivery of blank fields event lists >SASv12 · Post-XRL recalibration of the RDCTI · Mode-dependent redistribution tuning · Refereed paper on the calibration status of the EPIC-pn Timing Mode

EPIC-pn Timing Mode calibration status | Matteo Guainazzi et al. | EPIC-BOC | Leicester, 6/3/2012 |


Additional material

EPIC-pn Timing Mode calibration status | Matteo Guainazzi et al. | EPIC-BOC | Leicester, 6/3/2012 |


Timing
(EPIC Consortium, 2011, XMM-CAL-TN-0018)

EPIC-pn Timing Mode calibration status | Matteo Guainazzi et al. | EPIC-BOC | Leicester, 6/3/2012 |