{
  "bibcode": "2020GCN.27640....1P",
  "body": "M. Perri (ASDC), V. D'Elia (ASDC), A. D'Ai (INAF-IASFPA), D.N. Burrows\n(PSU), J. D. Gropp (PSU), J.A. Kennea (PSU), J.P. Osborne (U.\nLeicester), K.L. Page (U. Leicester) and P.A. Evans (U. Leicester)\nreport on behalf of the Swift-XRT team:\n\nSwift-XRT has performed follow-up observations of the INTEGRAL-detected\nburst GRB 200424A (Mereghetti et al. GCN Circ. 27634), collecting 5.0\nks of Photon Counting (PC) mode data between T0+13.2 ks and T0+30.7 ks.\n\n\nOne uncatalogued X-ray source has been detected consistent with being\nwithin the INTEGRAL position, however it is below the RASS limit and\nshows no definitive signs of fading. Therefore, at the present time we\ncannot confirm this as the afterglow. Details of this source are given\nbelow:\n\nSource 1:\n  RA (J2000.0):  307.5055  =  20:30:01.31\n  Dec (J2000.0): -39.7001  =  -39:42:00.5\n  Error: 3.0 arcsec (radius, 90% conf. [Enhanced position])\n  Count-rate: (8.3 [+1.7, -1.6])e-3 ct s^-1   \n  Distance: 22 arcsec from INTEGRAL position.\n  Flux: (2.68 [+0.55, -0.52])e-13 erg cm^-2 s^-1 (observed, 0.3-10 keV)\n\n\n\nSeven uncatalogued sources were also detected too far from the GRB\nposition to be likely afterglow candidates.\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/00020989.\n\nThis circular is an official product of the Swift-XRT team.",
  "circularId": 27640,
  "createdOn": 1587813086000,
  "email": "paolo.davanzo@inaf.it",
  "subject": "GRB 200424A: Swift-XRT observations",
  "submitter": "Paolo D'Avanzo at INAF - OAB  <paolo.davanzo@inaf.it>",
  "eventId": "GRB 200424A"
}