{
  "submitter": "Phil Evans at U of Leicester <pae9@star.le.ac.uk>",
  "subject": "GRB 260915A: Swift-XRT afterglow detection",
  "circularId": 45623,
  "body": "K.L. Page (U. Leicester), M. Perri (SSDC & INAF-OAR), V. D'Elia (SSDC &\nINAF-OAR), J.A. Kennea (PSU), S. Lanava (PSU), A.P. Beardmore (U.\nLeicester), J.P. Osborne (U. Leicester), B. Sbarufatti (INAF-OAB) and\nP.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 260915A. We searched for X-ray sources\nin 2.7 ks of Photon Counting (PC) mode data. The total exposure at the\nposition of the afterglow (see below) is 2.7 ks, obtained between\nT0+174.4 ks and T0+246.9 ks.\n\nAn uncatalogued X-ray source is detected within the estimated 3-sigma\nSVOM/MXT error region (49 arcsec). While the source does not fade\nduring the Swift-XRT observation, the measured flux of 2.0 (+7.4,\n-1.4)e-13 erg cm^-2 s^-1 (0.3-10 keV) is more than an order of\nmagnitude below the EP value of 7.8 (+/- 0.4)e-12 erg cm^-2 s^-1\n(0.5-10 keV) at T0+6 ks, reported in GCN Circ. 45587. This source is\ntherefore believed to be the afterglow.  The position of this source is\nRA, Dec=8.1546, +8.2487 which is equivalent to:\n\nRA (J2000): 00h 32m 37.11s\nDec(J2000): +08d 14' 55.5\"\n\nwith an uncertainty of 8.5 arcsec (radius, 90% confidence).  This\nposition is 23 arcsec from the SVOM/MXT position, and 11 arcsec from\nthe EP-FXT position.  \n\nThe results of the XRT-team automatic analysis are available at\nhttps://www.swift.ac.uk/xrt_products/00021912.\nThe results of the full analysis of the XRT observations are available\nat https://www.swift.ac.uk/ToO_GRBs/00021912.\n\nThis circular is an official product of the Swift-XRT team.\n\n",
  "eventId": "GRB 260915A",
  "submittedHow": "email",
  "createdOn": 1789712808357
}