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DC2 IRF Status. Meeting agenda, references at: http://confluence.slac.stanford.edu/display/DC2/060203 Deadlines Feb 10: finish parameterization definitions (functional forms, bins) Feb 13: finish implementation Feb 17: Verification Feb 20: Final report

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dc2 irf status
DC2 IRF Status
  • Meeting agenda, references at: http://confluence.slac.stanford.edu/display/DC2/060203
  • Deadlines
    • Feb 10: finish parameterization definitions (functional forms, bins)
    • Feb 13: finish implementation
    • Feb 17: Verification
    • Feb 20: Final report
  • Event Classes - finalized to be A and B as proposed by Julie
    • DC2Cuts.C now in DataChallenge package, under cvs control.
  • Effective area - Jean
  • Dispersion – Riccardo
  • PSF – Toby (new stuff)
the calibration data updated with new low energy
The calibration data – updated with new low energy
  • Photon response from “allgamma”
    • Version v7r3p4, with reprocess to update CTB variables
    • (4000-2)*50 K generated events into 6 m2:
      • uniformly in log(E) from 18 MeV to 180 GeV (4 decades)
      • uniform in cos() from -1 to 0 (upper LAT hemisphere)
    • (2000-1)*5 K generated 1.25 <log(E) < 3.75. (1.5 decades)
      • Factor of 40/3 more for E<562 MeV
  • Background
    • Version v7r3p5, also CTB updated, and filtered with CTBGAM>0
    • 18675 seconds of live time, distributed uniformly over 3 days of the DC2 orbit

new

psf jean
PSF - Jean

class A

class B

front

back

dispersion cont
Dispersion, cont
  • Parameterization of energy and angle in progress – needs more data at low energy, has not use the new run
  • Class B – big problem!
class b what to do with it
Class B: what to do with it
  • Substantial low energy tail in dispersion
    • These events will not be fit properly!
  • Is it worth it?

 I think not!

But if we include them, we have to treat the analysis properly: the effective area for analyses that depend on the energy must be reduced

?

good energy

psf toby
PSF (Toby)
  • Revise scaling function so that 68% containment is ~1 for class A.
psf cont
PSF, cont

class A back

  • Since the fit is restricted to ~10 68% radii, there is a potential normalization issue, if the predicted tail is different from the measured one.
    • The largest class A deviation is at right
    • class A front fits are all within 0.1%

overestimate: 0.5%

underestimate: 1.6%

addendum new class b
Addendum: new class B

Riccardo suggested to modify the class B definition by requiring CTBGoodEnergyProb>0.3 for all events.

Here are the resulting acceptances.

The blue points are those for which the measured energy is >60% of the actual.