{
  "bibcode": "2019GCN.24062....1D",
  "body": "P. D'Avanzo (INAF-OAB), J.A. Kennea (PSU), B. Sbarufatti\n(INAF-OAB/PSU), D.N. Burrows (PSU), J.P. Osborne (U. Leicester), K.L.\nPage (U. Leicester), A.P. Beardmore (U. Leicester), V. D'Elia (ASDC),\nA. D'Ai (INAF-IASFPA) and P.A. Evans (U. Leicester) report on behalf of\nthe Swift-XRT team:\n\nSwift-XRT has conducted further observations of the field of the\nMAXI-detected burst GRB 190404C  (Yamada et al., GCN Circ. 24049). The\nobservations now extend from T0+7.4 ks to T0+335.5 ks. \n\nOf the sources reported by D'Avanzo et al. (GCN Circ. 24054), \"Source\n3\" is fading with 3-sigma significance, and is therefore likely the GRB\nafterglow. Using 1249 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 = 220.84256, -22.66386\nwhich is equivalent to:\n\nRA (J2000): 14h 43m 22.21s\nDec(J2000): -22d 39' 49.9\"\n\nwith an uncertainty of 2.8 arcsec (radius, 90% confidence). This\nposition is 4.1 arcmin from the MAXI position. \n\nThe light curve can be modelled with a power-law decay with a decay\nindex of alpha=0.72 (+0.39, -0.22).\n\nThe results of the XRT-team automatic analysis are available at\nhttp://www.swift.ac.uk/xrt_products/00020887.\nThe results of the full analysis of the tiled XRT observations are\navailable at http://www.swift.ac.uk/xrt_products/TILED_GRB00079.\n\nThis circular is an official product of the Swift-XRT team.",
  "circularId": 24062,
  "createdOn": 1554735466000,
  "email": "valerio.delia@ssdc.asi.it",
  "subject": "GRB 190404C: Swift-XRT afterglow detection",
  "submitter": "Valerio D'Elia at ASDC  <valerio.delia@ssdc.asi.it>",
  "eventId": "GRB 190404C"
}