Comments (1)
Hmmm. Good question. I didn't write waterfaller.py (or several of the python modules it uses), and so I'd have to dig into the code. Looking quickly, it looks like they might use the center of the top subband as the reference frequency for the timing. PRESTO, in general, uses the center of the highest frequency channel as the time (and dedispersion) reference. There could also be an issue with how the dedispersion is done.
It might be worth making some fake data with a known short pulse in it and running it through single_pulse_search.py (after dedispersion) and the waterfaller.py to see if you can figure out where the offset is. Note that I haven't heard of this issue before, so it is possible that it was fixed in a more recent version of PRESTO! PRESTO 2 is very old now!
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