{
  "bibcode": "2013GCN.15206....1G",
  "body": "Dirk Grupe (PSU) reports on behalf of the Swift team:\n\nWe report on two follow-up observations of the field of GRB 130828A\nwhich was discovered by the FERMI LAT as reported by Vianello & \nSonbas (GCN circ 15128). The first Swift observation was performed \non 2013-09-04 (obsID 20293) for 2.6ks and was centered on the \nX-ray source reported in Grupe et al. (GCN circ. 15135). This X-ray\nsource is still present in the new observation suggesting that \nthese X-rays are emitted from the Seyfert 1.9 galaxy \nSDSS J171855.44+275947.4 as suggested by Grupe et al. Support\nfor this assumption comes from new IPN measurements by \nHurley et al. (GCN circ. 15138) who published a new IPN error box. \nThe X-ray source associated with SDSS J171855.44+275947.4 is \nsignificantly outside this error box.\n\nWe re-examined the Swift observation of the field which contains \nthe IPN error box (obsID 20289) and found enhanced X-ray emission \nwithin the IPN error  box reported by Hurley et al. Applying the \nBayesian statistics as  described by Kraft et al. (1991, ApJ, 374, \n344) suggesting a source  detection at the 3sigma level of \n(2.4+4.2-2.1)e-3 counts/s. The position of this marginally \ndetected source is:\n\nRA(hh mm ss.s) = 17h19m09.24s\nDec(dd mm ss.s) = +28:13:14.05\n\nwith an uncertainty of 8\".\n\nWe re-observed the position of this source with Swift on 2013-09-07 \nfor a total of 5157s (obsID 20295). No source was detected in this\nobservation. The 3sigma upper limit at the position of the \npreviously detected X-ray source within the IPN error box is \n1.3e-3 counts/s. This may suggest that the X-ray source found \nwithin the IPN error box during observation 20289 is the X-ray \nafterglow of GRB 130828A. Note, however, that considering the\n3sigma errors given above, this upper limit is non-conclusive. \n\nNo further Swift  observations are planned of this GRB.\n\nThis circular is an official product of the Swift team.",
  "circularId": 15206,
  "createdOn": 1378761193000,
  "email": "dxg35@psu.edu",
  "subject": "GRB 130828A: Further Swift XRT observations",
  "submitter": "Dirk Grupe at PSU/Swift-XRT  <dxg35@psu.edu>",
  "eventId": "GRB 130828A"
}