What are issues with the photon time accuracy?
Analysis requiring accurate photon timing should take into account the global deadtime effects described in FAQ 103, which vary with the global countrate, which in turn varies as stars go in and out of the fov with spacecraft pointing dither. Such analysis will also need to take into account the drift in event timing that is caused by spacecraft clock drift, which is corrected by weekly updates to spacecraft computers. I.e. photon event timing will drift during the week by up to a second.
