{
  "bibcode": "2021GCN.30324....1L",
  "body": "James Leung (University of Sydney/CSIRO), Poonam Chandra (NCRA-TIFR),\nEmil Lenc (CSIRO), Tara Murphy (University of Sydney), Ziteng Wang\n(University of Sydney/CSIRO)\n\nASKAP J123409+065712 is a radio source found in a search of\nAustralian Square Kilometre Array Pathfinder (ASKAP) data (SB10736).\nThe radio source position is consistent with the enhanced Swift-XRT\nposition (Osborne et al., GCN Circ. 17768) and inconsistent with the\nGROND source position (Knust et al., GCN Circ. 17767).\n\nWe conducted further observations of the radio source with the\nAustralia Telescope Compact Array (ATCA) and the upgraded Giant\nMetrewave Radio Telescope (uGMRT). We summarise these observations in\nthe table below.\n\nDate (UTC) | Telescope | Freq (GHz) | Peak Flux Density (uJy/beam)\n------------------------------------------------------------------\n2019/12/05 | ASKAP     | 1.4        | 363 +/- 56\n2021/05/21 | ATCA      | 5.5        |  94 +/- 26\n2021/06/13 | uGMRT     | 1.3        | 386 +/- 17\n\nThe fitted position of the radio source from the uGMRT observation is\nRA: 12:34:09.296\nDec: +06:57:13.83\n\nObservations of the radio source do not show any evidence for fading\nin epochs separated by 555 days and we therefore conclude the source\nis likely the host galaxy of GRB 150428A.\n\nWe thank CSIRO and GMRT staff for supporting these observations\nduring these especially difficult times.",
  "circularId": 30324,
  "createdOn": 1624715898000,
  "email": "jleu9465@uni.sydney.edu.au",
  "subject": "GRB 150428A: late-time radio observations",
  "submitter": "James Leung at U of Sydney/VAST  <jleu9465@uni.sydney.edu.au>",
  "eventId": "GRB 150428A"
}