Do not forget to rebin the background file in exactly the same manner. The TGS spectra are not background-subtracted. A background spectrum is provided for each source spectrum. The response matrix was calculated for the negative and positive orders separately, and subsequently folded to give the effective area as a function of energy for the folded spectra of 1024 channels. This is listed as yr.day, where yr is the last two digits of the year and day is the day of the year, e.g., day 300 of 1984 is 84.300.
Times are accurate to the nearest second.
The end time of the observation. RA The RA of the target. Dec The declination of the target. The declination of the pointing. This includes all dead time effects, interruptions in coverage etc.