A new version of the subcollimator response table (SRT_20020522.dat) has been uploaded and should appear in your ssw\hessi\dbase\grid_resp sub directory as part of a subsequent update. The new version includes prelimary values of phases for grids 1 and 2 so as to enable imaging with 2.3 arcseconds angular resolution. Parameters for grids 3-9 are the same as the current default. A few comments... * Since coarser grids can be processed faster than finer grids, you may notice that including grids 1 or 2 in your maps will esult in longer processing times. * Since a given grid only modulates source structure that is finer than about the grid resolution, some bursts may not have fine enough spatial structure to benefit from the use of grids 1 or 2. Their inclusion in such cases will not improve and may in fact slightly degrade the mapping. One option is to make preliminary maps first using grids 3 and higher to see if there are any apparently unresolved sources. * Note that since February, the grid 2 energy threshold has been set at ~20 keV, so it should not be used at energies below this. * You may see artifacts unless the pixel size is chosen to be about 1/2 or less than the FWHM of the finest subcollimator used in the map. This means that if you use grid 2, the pixel size should not be larger than 2 arcseconds, and if you use grid 1, you should use 1 arcsecond pixels or smaller. * An example of a burst that benefits from the use of the finer grids is the 2007 UT event on 25-March. Please let me know if you encounter any problems. Good luck! gordon