Status of EPIC-pn Timing Mode calibration

Matteo GuainazziESAC-ESA

M.Guainazzi, "Status of EPIC-pn timing mode calibration", EPIC-BOC, Madrid, 23/3/2010

Implemented rate-dependent CTI for both EPIC-pn Timing and Burst Mode

Align to fix of encircled energy correction bug in arfgen with SASv9.0

Why should we care?Mode used relatively seldom ( 5% of all observations in ≅

the XSA). However, basic mode for the X-ray binaries community

Three main problems reported to the HelpDesk:Poor residuals at the Silicon and Gold edgesEmission line of unknown origin at 1 keV in obscured ≅

sourcesControversy on the very existence of relativistically

broadened iron lines in Galactic Black Hole and Neutron Star systems





Γpn-ΓRXTE

BM: 0.24±0.07

TM: 0.19±0.03TM: 0.15±0.03

Sim

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39-4


Use the whole sample of 245 exposures in pn Timing Mode in the XSA

Retain only sources with a count rate ≤400 s-1 to avoid pile-up

Accumulate RAWY-dependent event listsFit the distributions for singles, doubles,

triples and quadruple events in the 0.7-10 keV band with a function:

PF(E) = a0 + a1 log(PI) + a2 log(PI)2






… doubles fraction





7-9 keV


The recalibration of the PF as a function of RAWY yields on the average an improvement of the agreement between true and CCF

However, full improvement requires the implementation of a spectral dependency of the PF for high (RAWY≥190) source position

Recommendations:Release the CCF Release NoteOpen an SCR on SAS to cope with the HR-

dependency


Documents

Status of EPIC-pn Timing Mode calibration