Dear RHESSI software users,

On Friday, March 3, we put some new RHESSI data accumulation software online in the SSW hessi atest directory. For the most part, the changes should be transparent to almost every user. The main changes are

* Since January 2014, electronic errors in the detectors moved some events to energies up to 100-150 keV higher than their actual energy. These events are now identified and removed. This effect was getting worse with time. If you found higher energy emission than expected, you should look again with this new software. * Livetime accumulations at very small time bins (<512 binary microseconds) were not being reported correctly. Fine time bins of that order are generally only necessary for real spatial structure on the order of a few arcseconds. If you were imaging sources far from the spin axis with Grid 1 this might have affected your results. * Accumulations across packet bunch boundaries were occasionally problematic. (The software can't process the full data request at once - it reads and processes groups or bunches of packets sequentially to accomplish that.) The effect was minor - an extremely short time interval of incorrect data at the boundary. Packet boundaries are now handled correctly.

More detail is provided at this link https://hesperia.gsfc.nasa.gov/ssw/hessi/doc/software/changes/sw_3-mar-2017....

(the full software change history is here: https://hesperia.gsfc.nasa.gov/ssw/hessi/doc/software/changes/sw_changes.htm...)

Richard and Kim