{
  "bibcode": "2021GCN.30379....1D",
  "body": "A. D'Ai (INAF-IASFPA), J.A. Kennea (PSU), A. Tohuvavohu (U. Toronto),\nB. Sbarufatti (PSU), K.L. Page (U. Leicester), A.P. Beardmore (U.\nLeicester), A. Melandri (INAF-OAB), T. Sbarrato (INAF-OAB) and P.A.\nEvans (U. Leicester) report on behalf of the Swift-XRT team:\n\nSwift-XRT has performed follow-up observations of the\nFermi/LAT-detected burst GRB 210704A (Berretta et al. GCN Circ. 30375),\ncollecting 2.6 ks of Photon Counting (PC) mode data between T0+53.5 ks\nand T0+61.1 ks. \n\nAn uncatalogued X-ray source is detected and is above the 2SXPS 3-sigma\nupper limit at this position, and is therefore likely the GRB\nafterglow. Using 2378 s of PC mode data and 2 UVOT images, we find an\nenhanced XRT position (using the XRT-UVOT alignment and matching UVOT\nfield sources to the USNO-B1 catalogue): RA, Dec = 159.02219, +57.21636\nwhich is equivalent to:\n\nRA (J2000): 10h 36m 05.33s\nDec(J2000): +57d 12' 58.9\"\n\nwith an uncertainty of 3.2 arcsec (radius, 90% confidence). This\nposition is 5.9 arcmin from the Fermi/LAT position.  We cannot\ndetermine at the present time whether the source is fading.\n\nThe results of the XRT-team automatic analysis are available at\nhttp://www.swift.ac.uk/xrt_products/00021454.\nThe results of the full analysis of the XRT observations are available\nat https://www.swift.ac.uk/ToO_GRBs/00021454.\n\nThis circular is an official product of the Swift-XRT team.",
  "circularId": 30379,
  "createdOn": 1625499255000,
  "email": "pae9@leicester.ac.uk",
  "subject": "GRB 210704A: Swift-XRT afterglow detection",
  "submitter": "Phil Evans at U of Leicester  <pae9@leicester.ac.uk>",
  "eventId": "GRB 210704A"
}