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25 September 2005
Francesco Longo reported last week that the times (like TSTART and TSTOP) in the GBM files of simulated bursts are not consistent with the times for the LAT bursts in the Checkout 3 data. This is apparently because the LAT event files and the GBM files have different values for MJDREF; the burst times are the same in the two sets of files, just measured with respect to different references; Johann Cohen-Tanugi tracked this down, and also pointed out that gtbin can be used with the GBM data by not specifying a spacecraft attitude file. The use of different MJDREFs was unintentional, but apparently some or all of the science tools do not check the value, and so the bursts appear to have different times for the two instruments. (Digel)
28 September 2005
I did for the third time the "tutorial" on GRB analysis tools using LAT data. This time I used the version of Science Tools for the Third Checkout.
I didn't find particular problems, except for the issue mentioned by Seth. In particular why the tools ask for the FT2 file while there's no need for it? The results of the analysis on the strongest burst are at this page http://www.ts.infn.it/~longof/grb_tutorial_4.html
Now I'm going to check the joint spectral analysis.
(Longo)