TITLE: GCN CIRCULAR NUMBER: 19205 SUBJECT: GRB 160310A: A further Swift-XRT observation, no afterglow detected DATE: 16/03/17 15:50:36 GMT FROM: Alessandro Maselli at INAF/IASF Palermo A. Maselli (INAF-IASFPA) and P. A. Evans (U. Leicester) report on behalf of the Swift-XRT team: On 2016 March 16, Swift-XRT has carried out a further observation of the field of GRB 160310A detected by Fermi (Vianello et al., GCN Circ. 19158; Toelge and Hui, GCN Circ. 19161), collecting 4.0 ks of data from T0+569 ks to T0+599 ks. The X-ray source reported by Gibson et al. (GCN Circ. 19162) is still detected with a count rate of (5.5+/-1.8)E-03 ct/s, showing no evidence of fading. Therefore, this source is not related to the GRB. The 3-sigma upper limit for the observation carried out between T0+40.3 ks and T0+46.7 ks, computed at the center of the Fermi-LAT error circle, is 3.8E-03 ct/s. We conclude that no afterglow has been identified by Swift-XRT for GRB 160310A. This circular is an official product of the Swift-XRT team.