1. Misspointing corections using DCs from stars. Javier López IFAE Software Meeting @ Udine 19th-20th April 2004

2. ● DCs Spot from Stars. – Analysis Methods – Information Extracted ● Misspointing Corrections. – Field of Views – Results Mrk421 Analysis ● 2004-02-15 ● 2004-03-19 ● Summary & Outlook. Software Meeting @ Udine 19th-20th April 2004 Outline

3. DC Spot From Stars Analysis Methods. –2D (Gausian) Fit. Different ‘image cleaning’ methods: –N Rings around 2 maximum pixels. –Masks (hot pixels, others stars, etc.) Task based. –MPSFFit, MPSFFitCalc –New macro psffit.C –'Hillas' like analysis. Non fitting procedured. –Less cpu demmanding. –Not so starting point dependend. For second order moments very ‘image cleaning’ depending. Macro based: psfhillaslike.C Software Meeting @ Udine 19th-20th April 2004 Cross-Check still on progress

4. Available Information. –Point Spread Function. –Stars Position/Path. Traking test. Misspointing corrections. UMa51 2004-02-15 mean position for each run. DC Spot From Stars Software Meeting @ Udine 19th-20th April 2004

5. Misspointing Corrections Fields of views. –Mrk421 [UMa51] –Crab [  Tauri & Tau 114] Software Meeting @ Udine 19th-20th April 2004

6. Results Analysis: –Cleaning level 3.0/1.5. –Dummy calibration (outter pixels signal x4) –Interpolation for bad pixels. –Cuts (IFAE++) Size > 2000 ADC 0.06 deg < Width < 0.12 deg 0.12 deg < Length < 0.26 deg 0.2 deg < Dist < 1.1 deg –Normalization ON-OFF from alpha dist. 30-80 deg. –Execces & Significance from alpha dist. 0-15 deg Software Meeting @ Udine 19th-20th April 2004

7. Mrk421 2004-02-15 With no misspointing correction. Software Meeting @ Udine 19th-20th April 2004

8. Mrk421 2004-02-15 Rotating of initial misspoiting (J.Rico) Software Meeting @ Udine 19th-20th April 2004

9. Mrk421 2004-02-15 Misspoiting correction from UMa15 DCs. Software Meeting @ Udine 19th-20th April 2004 Exist: MSrcPosFromFile Future: MSrcPosMrk421Calc MSrcPosCrabCalc

10. Mrk421 2004-03-19 With no misspointing correction. Software Meeting @ Udine 19th-20th April 2004

11. Mrk421 2004-03-19 Misspoiting correction from UMa15 DCs. Software Meeting @ Udine 19th-20th April 2004

12. Summary & Outlook We have an alternative to camera rotation. (a least for some sources) Tool to help tracking test. Integrated in Mars. A lot of work to be done. –Apply correction every few seconds instead of every run (synchronisation of DCs and raw data). –Estimate accuracy of misspointing with this method. False source method, etc. –Apply method to fields of view with several visible stars (Crab-Nebula) Software Meeting @ Udine 19th-20th April 2004