TITLE: GCN CIRCULAR NUMBER: 15610 SUBJECT: GRB 131224A: Swift-XRT observation DATE: 13/12/25 21:21:07 GMT FROM: Ben Gompertz at U.of Leicester B.P Gompertz, K.L. Page (U. Leicester) and M. De Pasquale (UCL-MSSL) report on behalf of the Swift-XRT team: We report on Swift-XRT observations of the field of the INTEGRAL discovered GRB 131224A (Mereghetti et al. GCN Circ 15607), starting 10.8 ks after the trigger. XRT began observing the field on 2013-12-24 at 19:53:56 UT (10.8 ks after trigger), with an exposure time of of 3.96 ks. No source is detected within the INTEGRAL error circle. The 3-sigma upper limit on the count rate is 3.5E-03 cts/s, which is 1.4E-13 erg cm^-2 s^-1 using a typical flux conversion of 4E-11 erg cm^-2 count^-1. This circular is an official product of the Swift-XRT team.