HEAD 2000, November 2000
Session 43. Missions and Instruments
Display, Friday, November 10, 2000, 8:00am-6:00pm, Bora Bora Ballroom

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[43.09] Timing Calibration of the USA Experiment

P. S. Ray, K. S. Wood, R. M. Bandyopadhyay, G. Fritz, P. Hertz, M. P. Kowalski, M. N. Lovellette, M. T. Wolff, D. Yentis (E. O. Hulburt Center for Space Research, Naval Research Laboratory), E. Bloom, W. Focke, B. Giebels, G. Godfrey, K.T. Reilly, P. Saz Parkinson, G. Shabad (Stanford Linear Accelerator Center, Stanford University), J. Scargle (NASA/ Ames Research Center, Moffett Field), D. Backer, A. Somer (Astronomy Department, U. of California, Berkeley), USA Experiment Science Working Group

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 \mus 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.

If you would like more information about this abstract, please follow the link to http://xweb.nrl.navy.mil. This link was provided by the author. When you follow it, you will leave the Web site for this meeting; to return, you should use the Back comand on your browser.

The author(s) of this abstract have provided an email address for comments about the abstract: Paul.Ray@nrl.navy.mil

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