Timing Calibration of the USA Experiment

Details Timing Calibration of the USA Experiment Timing Calibration of the USA Experiment

Oct 2000

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000head....5.4309r&link_type=abstract

American Astronomical Society, HEAD Meeting #5, #43.09; Bulletin of the American Astronomical Society, Vol. 32, p.1260

Astronomy and Astrophysics

Astronomy

Scientific paper

The USA Experiment on ARGOS is an X-ray proportional counter timing experiment, launched in January 1999, which is carrying out a broad program studying X-ray binaries, rotation-powered pulsars, and other bright X-ray sources. Photon events are time tagged to an accuracy of 2 μ s by reference to an onboard GPS receiver built by Boeing (then Rockwell International). Unfortunately, the GPS receiver has an anomaly that causes it to drop out of lock after a few hours. We describe the procedures developed to work around the GPS anomaly and recover accurate absolute time. Simultaneous observations of several rotation-powered pulsars with RXTE were made for comparison with contemporaneous radio timing measurements and to explore time transfer from satellite to satellite. Basic research in X-ray Astronomy at the Naval Research Laboratory is supported by NRL/ONR. Work on USA at SLAC is supported by Department of Energy contract DE-AC03-76SF00515.

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