Luxury fashion group Burberry has enjoyed an excellent run since joining the ranks of the FTSE 100 and its good fortune continues today after JP Morgan raised its target price on the group.After yesterday's well-received trading update, in which Burberry reported a better-than-expected 5% rise in second quarter sales thanks to a good performance in Europe and Asia, the broker has lifted its target price on the group to 540p from 480p.JPM says its new view of Burberry reflects better like-for-like sales and higher margins.