{
  "bibcode": "2022GCN.31866....1P",
  "body": "M. Perri (SSDC & INAF-OAR), V. D'Elia (SSDC & INAF-OAR), A. D'Ai\n(INAF-IASFPA), D.N. Burrows (PSU), J. D. Gropp (PSU), J.A. Kennea\n(PSU), J.P. Osborne (U. Leicester), K.L. Page (U. Leicester), A.P.\nBeardmore (U. Leicester) and P.A. Evans (U. Leicester) report on behalf\nof the Swift-XRT team:\n\nSwift-XRT has performed follow-up observations of GRB 220403C, detected\noutside the BAT coded FOV by GUANO NITRATES (Aaron Tohuvavohu et al.\nGCN Circ. 31824), as well as by Fermi-GBM, INTEGRAL, CALET and\nISS-ASIM, collecting 3.2 ks of Photon Counting (PC) mode data between\nT0+497.7 ks and T0+528.5 ks. \n\nSix uncatalogued X-ray sources have been detected, however none of them\nis above the RASS limit or shows definitive signs of fading. Therefore,\nat the present time we cannot identify which, if any, is the afterglow.\nDetails of these sources are given below:\n\nSource 1:\n  RA (J2000.0):  19.7120  =  01:18:50.87\n  Dec (J2000.0): -56.4530  =  -56:27:10.8\n  Error: 11.4 arcsec (radius, 90% conf.)\n  Count-rate: (3.7 [+3.1, -2.2])e-3 ct s^-1   \n  Distance: 515 arcsec from ASIM position.\n\nSource 2:\n  RA (J2000.0):  19.6293  =  01:18:31.04\n  Dec (J2000.0): -56.3726  =  -56:22:21.5\n  Error: 8.4 arcsec (radius, 90% conf.)\n  Count-rate: (3.8 [+3.0, -2.2])e-3 ct s^-1   \n  Distance: 530 arcsec from ASIM position.\n\nSource 3:\n  RA (J2000.0):  19.7466  =  01:18:59.17\n  Dec (J2000.0): -56.4578  =  -56:27:28.0\n  Error: 9.1 arcsec (radius, 90% conf.)\n  Count-rate: (6.2 [+3.7, -2.8])e-3 ct s^-1   \n  Distance: 484 arcsec from ASIM position.\n\nSource 4:\n  RA (J2000.0):  19.7142  =  01:18:51.41\n  Dec (J2000.0): -56.2603  =  -56:15:37.1\n  Error: 6.7 arcsec (radius, 90% conf.)\n  Count-rate: (4.3 [+1.7, -1.3])e-3 ct s^-1   \n  Distance: 479 arcsec from ASIM position.\n  Flux: (2.90 [+1.13, -0.91])e-13 erg cm^-2 s^-1 (observed, 0.3-10 keV)\n\n\nSource 5:\n  RA (J2000.0):  19.7189  =  01:18:52.53\n  Dec (J2000.0): -56.2878  =  -56:17:16.2\n  Error: 6.8 arcsec (radius, 90% conf.)\n  Count-rate: (1.17 [+1.01, -0.72])e-3 ct s^-1\t \n  Distance: 411 arcsec from ASIM position.\n\nSource 6:\n  RA (J2000.0):  19.9526  =  01:19:48.63\n  Dec (J2000.0): -56.2605  =  -56:15:37.7\n  Error: 6.8 arcsec (radius, 90% conf.)\n  Count-rate: (2.13 [+1.25, -0.92])e-3 ct s^-1\t \n  Distance: 344 arcsec from ASIM position.\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/00021484.\n\nThis circular is an official product of the Swift-XRT team.",
  "circularId": 31866,
  "createdOn": 1649530600000,
  "email": "pae9@leicester.ac.uk",
  "subject": "GRB 220403C: Swift-XRT observations",
  "submitter": "Phil Evans at U of Leicester  <pae9@leicester.ac.uk>",
  "eventId": "GRB 220403C"
}