Table from Steve, Bob and Eduardo Last Revision February 04, 2003

The idea of this table is to determine the knowledge we need for every parameter

Science Requirements

Parameter LAT requirements Knowledge Goal EGRET
Aeff

(>100 MeV)

 @ 100 MeV
  • > 3000 cm2

@ 300 GeV (TBR)

  • > 6400 cm2
20 % 10 % 10-15% > 70 MeV
Aeff

(<100 MeV)

@ 20 MeV (TBR)
  • > 300 cm2
50 % 10 % 50-100% < 70 MeV (contamination)
Beam Flux

---

crucial for

effective area

 TBD

E_resolution

 (>100 MeV)

< 10%
  • (100-10000 MeV)

< 20% (TBR)

  • (10 GeV-300 GeV)
need input from CAL 10% of resolution ~10% of resolution
E_resolution

(<100 MeV)

 < 50% (TBR) need input from CAL 10% of resolution ~10% of resolution
PSF68% @100 MeV
  • < 3.5 deg front
  • < 6 deg back

E = 10 GeV-300 GeV

  • < 0.15 front
  • < 0.3 back (TBR)
20 % (BT99/00)

 

 10 %

(TBR)

 

PSF95%  < 3 x PSF 68% need to revisit need to revisit Sum of Gaussians, better method was using pulsars
Angle of Incidence of the beam

---

we do not

know yet

0.1 degree 0.1 degree

fish-eye effect

Beam divergence about 0.006 degrees
Field of View > 2 sr
Deadtime important for livetime