misspointing corections using dcs from stars. javier lópez ifae software meeting @ udine 19th-20th...
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Misspointing corections using DCs from stars.
Javier López
IFAE
Software Meeting @ Udine 19th-20th April 2004
● 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
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.CSoftware Meeting @ Udine 19th-20th April 2004
Cross-
Check
still
on
prog
ress
• 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
Misspointing Corrections
• Fields of views.– Mrk421 [UMa51]
– Crab [ Tauri & Tau 114]
Software Meeting @ 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. 30-80 deg.– Execces & Significance from alpha dist. 0-15 deg
Software Meeting @ Udine 19th-20th April 2004
Mrk421 2004-02-15
• Rotating of initial misspoiting (J.Rico)
Software Meeting @ Udine 19th-20th April 2004
Mrk421 2004-02-15
• Misspoiting correction from UMa15 DCs.
Software Meeting @ Udine 19th-20th April 2004
Exist:MSrcPosFromFile
Future:MSrcPosMrk421CalcMSrcPosCrabCalc
Mrk421 2004-03-19
• Misspoiting correction from UMa15 DCs.
Software Meeting @ 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 Meeting @ Udine 19th-20th April 2004