1. T. Burnett: DC2 kickoff 2-Mar-061 DC2 Orbit and Background Orbit: 55 days Pointing strategy: scan & rock! Background Model generation Interleave with signal Trigger Hardware Onboard filter Deadtime SAA Simulated trigger rate Toby Burnett University of Washington

2. T. Burnett: DC2 kickoff 2-Mar-062 The big picture

3. T. Burnett: DC2 kickoff 2-Mar-063 The Orbit Time references (UT) Mission start 00:00 1-1-2001 This simulation 00:00 1-1-2008 JD 2454466.5 = MJD 54466 MET: 220838400 Stoneking simulator “launch” from lat,lon=(0,0) at -900 s. Altitude 561 km. (6939 km radius) Inclination 28.48  (Cape Canaveral latitude) (next DC: maybe 25.3  ?) Recorded from t=0 to t=56 days in 30 s increments. 161250 entries t=0 theCape “launch”

4. T. Burnett: DC2 kickoff 2-Mar-064 Why 55 days? Precession For the inclination, 55.2 period. Note initial azimuth is 0, an accident.

5. T. Burnett: DC2 kickoff 2-Mar-065 DC2 Backgrounds S. Ritz (at the IA workshop): “Backgrounds are unbelievably unknown” “DC2 background model is about right”

6. T. Burnett: DC2 kickoff 2-Mar-066 Generate an event current time Background tuples source model pseudo-background pointing history Earth location output tuple generate position, orientation select incoming particle trigger? alive? generate output select event replace position info signal no yes background no reconstruct simulate yes in SAA? signal? no yes