Figure 12 shows the delay in the time tags for the SXT images. There is a delay between the major frame time and the time that SXTE-J triggers an exposure (exposures are taken on the major frame boundaries). The SXTE-J delay is included in the time saved in the index. The delay in the SXTE-U between receiving the exposure trigger and the actual start of integration is not included in the time in the index. The user must get the exposure latency from the GT_EXPLAT routine, whose values typically range from 50 to 100 millisec.
The first example below shows how to get the true start of integration time of an
image. The second example shows how to get the mid point of the integration time.
IDL> start = anytimts(index, off=gt_explat(index)/1000.)
IDL> mid = start + gt_expdur(index)/1000./2.)
