{
  "format": "text/markdown",
  "createdOn": 1724776914517,
  "eventId": "GRB 240819A",
  "circularId": 37311,
  "subject": "GRB 240819A: Swift afterglow confirmation",
  "submittedHow": "web",
  "submitter": "Antonino D'Ai' at IASF-PA <antonino.dai@inaf.it>",
  "bibcode": "2024GCN.37311....1D",
  "body": "Antonino D’Ai, Elena Ambrosi (INAF/IASF-PA) report on behalf of the Swift-XRT team:\n\nSwift performed a second epoch follow-up observation for Source2 (D’Avanzo et al., GCN 37218), the likely counterpart for the SVOM/Eclairs-detected X-ray transient GRB 240819A (Coleiro et al., GCN 37208). We collected 3.4 ks of Photon Counting (PC) mode data between T0+6.01 days and  T0+7.67 days. \n\nAt the position of Source2 (previously detected at rate 11(+3.5, -2.9) x 10^-3 ct/sec), no source is detected with a 3-sigma upper limit of 3.5 x 10^-3 ct/sec. \n\nThe upper limit is evidence for the lightcurve fading of this source, confirming the afterglow association with GRB 240819A.\n\nThis circular is an official product of the Swift-XRT team."
}