{
  "circularId": 45704,
  "submittedHow": "web",
  "createdOn": 1790172412807,
  "submitter": "Lauren Rhodes at McGill <lauren.rhodes@mcgill.ca>",
  "body": "L. Rhodes (TSI/McGill), G. E. Anderson (CSIRO), A. J. van der Horst (GWU), J. K. Leung (UofT/HUJI), S. Chastain (TTU), A. Gulati (Utah), J. Chauhan (ULeicester) on behalf of the PanRadio GRB collaboration\n\nWe observed GRB 260909A (Saccardi et al., GCN 45534) starting at 18-Sep-2026 14:56UT for 4 hours with the Australia Telescope Compact Array (ATCA), as part of the \"PanRadio GRB\" Large ATCA follow-up programme C3542 (PI. Anderson).\n\nWe report a preliminary detection of a radio counterpart at coordinates consistent with those reported in de Ugarte Postigo et al., (GCN 45597):\n7.2GHz 59+/-9uJy\n9.1GHz 62+/-8uJy\n11.0GHz 86+/-9uJy\n\nThe positive spectral index indicates that the spectral peak of the afterglow is above the ATCA observing band. More observations are ongoing.\n\nWe thank the CSIRO Space and Astronomy staff for supporting these observations.\nWe acknowledge the Gomeroi people as the traditional owners of the Observatory site. The Australia Telescope Compact Array is part of the Australia Telescope National Facility (https://ror.org/05qajvd42) which is funded by the Australian Government for operation as a National Facility managed by CSIRO.",
  "format": "text/plain",
  "subject": "ATCA observations of GRB 260909A",
  "eventId": "GRB 260909A",
  "eventType": [
    "GRB",
    "Radio Transient"
  ]
}