Crab angle

Keywords SBR STAP earth rotation range ambiguity crab angle crab magnitude Doppler dispersion range dependency waveform diversity Doppler warping. 

Fig. 20 shows the crab angle and crab magnitude as a function of SBR latitude for different inclination angles. Once again about 3.77° error can be expected for the crab angle in the worst case. 

Figure 21. Effect of crab angle on range-Doppler profile.

In March 2004, Crab was observed for a total of 3.7 hours ON-source and 4.2 hours OFF-source over a zenith angle range between 25° and 50°. The ALPHA distributions for ON and OFF data samples after selection cuts for SIZE greater than 2000 photons are shown in Figure 6. A clear signal is observed for lower values of ALPHA with an excess of 1302 events and a significance... 

A simulated observation of the Crab pulsar was performed in the energy band between 0.75 and 5 MeV, assuming the 7-rays are 100% linearly polarized with the electric vector 1] at 0 to the x-axis of COMPTEL. Also it was being observed 15° off axis with the azimuth angle as 0° to the x-axis. The data sets obtained contain 10 unpolarized and 10 polarized events. 

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