"Fast" Fourier Transform / Spectrum Analysis Problem / SGR Analysis
As I listened to the scientists in the weekly Friday x-ray group meeting recall how long running fast Fourier transforms on a computers used to take, I was amused by the fact that I was at that moment running an FFT in my office which was taking far longer than I thought it should. Being away from my computer when it finished, I don’t know how long it took to run an FFT on a segment of the SGR with 100 times the minimum time resolution, but I would guess tens of minutes. It hasn’t given me a memory error yet, so I can’t say if it’s the same problem I ran into before or whether this is a new problem.
I went back through the first wt data set and fixed a problem I had been having making an ancillary response file. Unfortunately, I couldn’t do much with that spectrum once I made it due to lack of photon counts. I also fixed up two other sets and found two more bursting events in one of the later observations, also due to the whole detector. As luck would have it, I also couldn’t do any kind of modeling with that spectral profile because of lack of photon counts. It’s a little frustrating, but there’s nothing I can do. I can only work with what I have.
I tallied up what I’ve achieved with SGR1900+14 and decided that I’m essentially done with everything but the timing analysis. I would like to confirm the spin period so I know my method is correct. However, unless I can get the FFTs to run in a more timely manner, I don’t know how much I’ll be able to accomplish.




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