1. Data Analysis Markarian 421 – 14.-15.02.2004 Crab Nebula – 27.01.2004 Crab Nebula – 15.02.2004  2 dim plots : false source analysis  Miss-pointing study  Light Curves Data:

2. Applied Cuts (David’s Talk) 0.12 < LENGTH < 0.32 0.06 < WIDTH < 0.15 0.6 < DIST < 1.3 SIZE > 3000 ( photons) Calculate significance: Li&Ma (1983) formula #17 ALPHA(max) = 10 degrees

3. False source analysis Calculate once source independent parameters: LENGTH, WIDTH, SIZE, etc For each assumed source position calculate source dependent parameters: DIST, ALPHA The movement of the sky (derotation) The same procedure for ON and OFF

4. 2 dim sky plot Camera coordinatesSky coordinates

5. 2 dim sky plot (N ex) Camera coordinates Sky coordinates

6. Why is the spot not very narrow? Center of the camera is not the center of the rotation? Divide the ON sample in several sub-samples No derotation Use the whole OFF sample to calculate significance

7. Tracking / Miss-pointing

8. Estimation of the source position in each of the sub-samples Several criteria: Significance Number of excess events Alpha plot: signal and background shape Alpha plots of the nearby positions

9. Estimated source positions

10. First light curve Markarian 421

11. Fine binning: 25 samples Normal spotAbnormal spot (1 run)

12. Closer look to this sub-sample 2 minutes, 1 Run, no reports in the runbook First 5633 eventsLast 5633 events

13. Following the miss-pointing

14. Mrk421: 2 nd ON sample Derotation around the center of the camera Displacement from the center of around 0.3 deg Roundish spot

15. Second light curve

16. Zenith and azimuth angle

17. Crab: 27th January 2004

18. Crab: 14 th - 15 th February 2004

19. Conclusion / outlook All three samples: clear detection Weak sources (even Crab!) still difficult to analyze. Possible reasons: miss-pointing unstable movement many “dead” pixels

20. Mrk 421 OFF

21. ASYMMETRY

22. Asymmetry: MC photons 73% 27%

23. Asymmetry: MC protons 40% 60%

24. Asymmetry: Mrk 421 ON 44% 56%

25. Asymmetry: Mrk 421 OFF 39% 61%

26. Asymmetry: Crab ON 40% 60%

27. Asymmetry: Crab OFF 38% 62%