{
  "subject": "GRB 160310A: A further Swift-XRT observation, no afterglow detected",
  "eventId": "GRB 160310A",
  "bibcode": "2016GCN.19205....1M",
  "createdOn": 1458229836000,
  "circularId": 19205,
  "submitter": "Alessandro Maselli at INAF/IASF Palermo  <maselli@ifc.inaf.it>",
  "email": "maselli@ifc.inaf.it",
  "body": "A. Maselli (INAF-IASFPA) and P. A. Evans (U. Leicester) report on behalf \nof the Swift-XRT team:\n\nOn 2016 March 16, Swift-XRT has carried out a further observation of the \nfield of GRB 160310A detected by Fermi (Vianello et al., GCN Circ. \n19158; Toelge and Hui, GCN Circ. 19161), collecting 4.0 ks of data from \nT0+569 ks to T0+599 ks. The X-ray source reported by Gibson et al. (GCN \nCirc. 19162) is still detected with a count rate of (5.5+/-1.8)E-03 \nct/s, showing no evidence of fading. Therefore, this source is not \nrelated to the GRB. The 3-sigma upper limit for the observation carried \nout between T0+40.3 ks and T0+46.7 ks, computed at the center of the \nFermi-LAT error circle, is 3.8E-03 ct/s. We conclude that no afterglow \nhas been identified by Swift-XRT for GRB 160310A.\n\nThis circular is an official product of the Swift-XRT team."
}