{
  "body": "A. D'Ai (INAF-IASFPA), J.A. Kennea (PSU), D.N. Burrows (PSU), M. A.\nWilliams (PSU), A.P. Beardmore (U. Leicester), J.P. Osborne (U.\nLeicester), A. Melandri (INAF-OAR), T. Sbarrato (INAF-OAB) and P.A.\nEvans (U. Leicester) reports on behalf of the Swift-XRT team:\n\nSwift-XRT has performed follow-up observations of the\nFermi/GBM-detected burst GRB 240910A (GCN Circ. 37441), centred on the\nposition of the candidate optical counterpart detected by GOTO:\nGOTO24fvl/AT2024vfp (Julakanti et al., GCN Circ. 37459). XRT has\ncollected 1.9 ks of Photon Counting (PC) mode data between T0+128.3 ks\nand T0+135.2 ks. \n\nAn uncatalogued X-ray source is found at the GOTO position. Its current\nflux is below historical upper limits and we cannot currently confirm\nfading; thus, based on X-ray data alone we cannot identify this as a\ntransient. However, given its coincidence with the GOTO source, we\nsuggest that is it likely to be the GRB afterglow.\n\nDetails of this source are given below:\n\nSource 2:\n  RA (J2000.0):  24.0972  =  01:36:23.32\n  Dec (J2000.0): -0.2047  =  -00:12:17.1\n  Error: 4.0 arcsec (radius, 90% conf. [Enhanced position])\n  Count-rate: 0.0182 +/- 0.0042 ct s^-1   \n  Distance: 2 arcsec from GOTO position.\n  Flux: (7.3 +/- 1.7)e-13 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/00021712.\n\nThis circular is an official product of the Swift-XRT team.\n\n",
  "circularId": 37461,
  "bibcode": "2024GCN.37461....1D",
  "eventId": "GRB 240910A",
  "subject": "GRB 240910A: Swift-XRT detection of GOTO24fvl/AT2024vfp",
  "submitter": "Phil Evans at U of Leicester <pae9@star.le.ac.uk>",
  "submittedHow": "email",
  "createdOn": 1726086731853
}