{
  "eventId": "GRB 250219A",
  "circularId": 39379,
  "createdOn": 1740013630458,
  "bibcode": "2025GCN.39379....1K",
  "subject": "GRB 250219A: Swift-XRT observations",
  "body": "J. A. Kennea (PSU), B. Sbarufatti (INAF-OAB), C. Salvaggio (INAF-OAB),\nM. Ferro (INAF-OAB), D.N. Burrows (PSU), M. A. Williams (PSU), S.\nDichiara (PSU), J.P. Osborne (U. Leicester), K.L. Page (U. Leicester)\nand P.A. Evans (U. Leicester) reports on behalf of the Swift-XRT team:\n\nSwift-XRT has performed follow-up observations of the\nSVOM/ECLAIRs-detected burst GRB 250219A, collecting  323 s of Photon\nCounting (PC) mode data between T0+4.9 ks and T0+11.3 ks. \n\nOne uncatalogued X-ray source has been detected within the estimated\n3-sigma SVOM/ECLAIRs error region (557 arcsec), it is below the RASS\nlimit and shows no definitive signs of fading. Therefore, at the\npresent time we cannot confirm this as the afterglow. Details of this\nsource are given below:\n\nSource 1:\n  RA (J2000.0):  173.3707  =  11:33:28.97\n  Dec (J2000.0): +22.7056  =  +22:42:20.2\n  Error: 5.2 arcsec (radius, 90% conf.)\n  Count-rate: 0.072 +/- 0.018 ct s^-1\t\n  Distance: 317 arcsec from SVOM/ECLAIRs position.\n  Flux: (2.19 +/- 0.54)e-12 erg cm^-2 s^-1 (observed, 0.3-10 keV)\n\nThe results of the XRT-team automatic analysis of the XRT observations,\nincluding a position-specific upper limit calculator, are available at\nhttps://www.swift.ac.uk/ToO_GRBs/00021785.\n\nThis circular is an official product of the Swift-XRT team.\n\n",
  "submitter": "Phil Evans at U of Leicester <pae9@star.le.ac.uk>",
  "submittedHow": "email"
}