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

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Presentation transcript:

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

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

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 Udine 19th-20th April 2004 Cross-Check still on progress

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

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

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 deg. –Execces & Significance from alpha dist deg Software Udine 19th-20th April 2004

Mrk With no misspointing correction. Software Udine 19th-20th April 2004

Mrk Rotating of initial misspoiting (J.Rico) Software Udine 19th-20th April 2004

Mrk Misspoiting correction from UMa15 DCs. Software Udine 19th-20th April 2004 Exist: MSrcPosFromFile Future: MSrcPosMrk421Calc MSrcPosCrabCalc

Mrk With no misspointing correction. Software Udine 19th-20th April 2004

Mrk Misspoiting correction from UMa15 DCs. Software Udine 19th-20th April 2004

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 Udine 19th-20th April 2004