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42.1 Uncertainty in EXPSTART and EXPEND

An uncertainty of ~0.1 seconds was found in the way in which EXPSTART and EXPEND are calculated. The time indicated in the FITS headers for these keywords is only accurate to 1 second. HSP ISR 12 (Percival, 1992) describes in detail the reduction of the five HSP observations of the Crab pulsar [reference 2]. In that document, a detailed description of the correlation of the HST clock with UTC is defined.



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