Exercise 6: Putting It All Together

You can treat the LAT data file just like a GBM file. The main difference is that you have very low background. rmfit would still like you to pick a background interval, so just select an interval before and after the burst and use a 0-order polynomial (i.e., average) to fit it.

With the LAT data, it is worth binning the spectra up quite a lot as there are few counts in each channel and the residuals can look misleading.

Use the time interval in the paper: 0.5 s to 1.0 s.
Try a Band function.
Try adding a power law component.

You will find these fits are far more sensitive to the starting parameters than the simpler fits you used with the GBM data alone.

Try using reduced time intervals, if necessary refining the GBM TTE time bins to match the LAT 100 ms bin boundaries.

You may want to include more than just n6,7 and b1 on the GBM side.

Let me know if you are struggling!

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