... mode

While the XRT has a number of different observing modes, only Imaging and PC event mode data provide 2-dimensional images of the sky necessary for determining GRB positions.

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... cases

At the time of writing, we have derived UVOT-enhanced XRT positions for 84 out of 120 GRBs detected by Swift since April 2006 when the current filter sequence was implemented, and for 148 bursts in total (see Table 2).

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...$\langle$targetID

The target ID is the trigger number padded to 8 digits with leading zeroes. e.g. GRB 070531 was trigger 280958, so has target ID 00280958.

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