Fermi LAT Xspec Analysis (version 1.1.0) The Latspec is a graphical interactive analysis tool designed for reduction and analysis of the Fermi/LAT (http://fermi.gsfc.nasa.gov/ssc) data using Xspec astrophysical spectral fitting package (http://heasarc.gsfc.nasa.gov/docs/xanadu/xspec). The tool is integrated with Fermi Science Tools, FTOOLS, Xspec and DS9 imaging tool (hea-www.harvard.edu/RD/ds9) to provide fast and convenient analysis steps from LAT server data to spectral modeling. To install: # verify that you have installed ds9 and that the Fermi # Science tools, FTOOLS and Xspec are properly installed and set up # unpack the source tar file and change to the source directory > tar zxvf latspec-1.1.0.tar.gz > cd latspec-1.0 # install in the default python directory in the Fermi Science # tools directory > python setup.py install To run: > latspec For more detailed help press "Help" button in the lower part of the program window. Note: Latspec lightcurve extraction relies on the cpflux Xspec model to estimate fluxes. To make sure lightcurve part of the program is working properly, please, install Xspec version 12.8.1 or later before using Latspec. Contact nikolai.v.shaposhnikov@nasa.gov for any questions. Nikolai Shaposhnikov