Other
Scientific paper
Dec 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006aas...20916407r&link_type=abstract
2007 AAS/AAPT Joint Meeting, American Astronomical Society Meeting 209, #164.07; Bulletin of the American Astronomical Society,
Other
1
Scientific paper
We performed an absolute time calibration of the Chandra clock through simultaneous observations by Chandra and the Rossi X-ray Timing Explorer (RXTE) of the millisecond pulsar PSR B1821-24. Using an updated clock correlation file, we find that the error in the Chandra clock, with respect to the RXTE clock, is 4±3 μs. Considering that the uncertainty in the RXTE times is typically 2 μs and taking into account other sources of error, we conclude that Chandra time is off by 4±4 μs. We add two caveats to this. First, this is only a single snapshot measurement; although we feel confident about the stability of the Chandra clock, we cannot entirely exclude the possibility of random or systematic variations in this offset. Second, first-version standard production data are typically run by CXC with an extrapolated clock correlation; in this particular case the error in the extrapolated clock correlation was 3±1 μs, but that is not necessarily a typical value. The final conclusion is that with careful processing we may reasonably have confidence that Chandra absolute time can achieve an accuracy of 4 μs.
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