{
  "bibcode": "2021GCN.29908....1P",
  "body": "M. Perri (SSDC & INAF-OAR), V. D'Elia (SSDC & INAF-OAR), A. D'Ai\n(INAF-IASFPA), A. Tohuvavohu (U. Toronto), B. Sbarufatti (PSU), D.N.\nBurrows (PSU), J.P. Osborne (U. Leicester), K.L. Page (U. Leicester),\nA.P. Beardmore (U. Leicester) and P.A. Evans (U. Leicester) report on\nbehalf of the Swift-XRT team:\n\nSwift-XRT has performed follow-up observations of the\nSwift/BAT-GUANO-detected burst GRB 210323B (James DeLaunay et al. GCN\nCirc. 29701), collecting 10.2 ks of Photon Counting (PC) mode data\nbetween T0+100.8 ks and T0+1300 ks. \n\nOne uncatalogued X-ray source has been detected consistent with being\nwithin the Swift/BAT localization, it is below the RASS limit\nand shows no definitive signs of fading. Therefore, at the present time\nwe cannot confirm this as the afterglow. Details of this source are\ngiven below:\n\nSource 1:\n  RA (J2000.0):  259.6867  =  17:18:44.80\n  Dec (J2000.0): +15.6339  =  +15:38:02.2\n  Error: 4.6 arcsec (radius, 90% conf.)\n  Count-rate: (1.18 [+0.71, -0.52])e-3 ct s^-1\t \n  Distance: 173 arcsec from Swift/BAT position.\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/00021426.\n\nThis circular is an official product of the Swift-XRT team.",
  "circularId": 29908,
  "createdOn": 1619544770000,
  "email": "aaron.tohu@gmail.com",
  "eventId": "GRB 210323B",
  "subject": "GRB 210323B: Swift-XRT observations",
  "submitter": "Aaron Tohuvavohu at U Toronto  <aaron.tohu@gmail.com>"
}