Fermi Gamma-ray Space Telescope

Orbital Phase

The pulsar may be in a binary system, and thus events can be assigned both a pulsar spin and a binary phase; the gtophase tool assigns an orbital phase to each count. The Binary Orbital Phase Calculation analysis thread demonstrates how this tool is run.

In this case the binary ephemeris must be extracted from a pulsar ephemerides database, such as the database provided by the Fermitools installation. As with gtpsearch and gtpphase, the tool prompts for the ephemeris filename, and the name of the pulsar should be entered at the 'Pulsar name' query. As with gtpphase, the input and output files are the same. An ORBITAL_PHASE column will be added to the output file.


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