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

• With no misspointing correction.

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

• With no misspointing correction.

Software Meeting @ Udine 19th-20th April 2004

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