My cosmic ray telescope
Experimental results

I got some long counts from my telescope. With 0 zenith angle, 8 cm distance between tubes, counting for 3 hours and 17 minutes, I got 42 coincidences, that is 0.213 count/min. I also computed spurious coincidences due to the length of the GC pulses, that is 0.04 count/min. So I suppose that the real cosmic coincidence could be 0.17.
I think it is possible to diminish spurious coincidence lowering the pulse length of the GCK-05, that it is much longer than the GCA-04. This can be done modifiing the value of the RC product for the NE555 IC.

I will provide more data in the future!!

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