{
  "bibcode": "2009GCN.10181....1D",
  "body": "V. D'Elia, M. Perri (ASDC), J. Cummings (GSFC/CRESST)  report\non behalf of the Swift-XRT team:\n\nWe have analysed further 4.0 ks of XRT data for GRB 091117 (Cummings\net al. GCN Circ. 10171), from 161.3 ks to 172.4 ks after the trigger.\nThe data are entirely in Photon Counting (PC) mode.\n\nWe found that Source #1 (Berger, GCN Circ. 10173; D'Elia et al.,\nGCN Circ. 10177; Fox, GCN Circ. 10179) is detected with a count rate of\n(1.9+/-0.9)e-3 cts/s, thus showing some evidence of fading with respect\nto the first Swift follow-up observation (errors are given at the\n1-sigma level). We note that the photon statistics is low and further\nobservations are needed to firmly assess that this source is the X-ray\nafterglow of the burst.\n\nSource #2 (D'Elia et al., GCN Circ. 10177; Fox, GCN Circ. 10179) is\ninstead\nnot detected. The derived 3-sigma upper limit value on its count rate,\n~3.3e-3 cts/s, does not allow to constrain the temporal behavior of this\nsource.\n\nThis circular is an official product of the Swift-XRT team.",
  "circularId": 10181,
  "createdOn": 1258674465000,
  "email": "perri@asdc.asi.it",
  "subject": "GRB 091117: Swift-XRT observations",
  "submitter": "Matteo Perri at ISAC/ASDC  <perri@asdc.asi.it>",
  "eventId": "GRB 091117"
}