{
  "subject": "VLA observations of GW170817 at ~3.3 years post-merger",
  "submitter": "Kate Alexander at Northwestern U  <kate.alexander@northwestern.edu>",
  "circularId": 29053,
  "body": "K. D. Alexander, A. Hajela, R. Margutti, J. Bright (Northwestern U.), T.\nEftekhari (Harvard U.), A. Kathirgamaraju (UC Berkeley), and E. Berger\n(Harvard U.) report on behalf of a larger collaboration:\n\nWe observed GW170817 with the NSF���s Karl G. Jansky Very Large Array (the\nVLA) at t =1216 days (~3.3 years) after the binary neutron star merger\n(joint program SL0449, PI: Margutti). In our preliminary analysis, no radio\nemission is detected at the location of GW170817; we infer a 3-sigma upper\nlimit of ~13 microJy at a central frequency of 3 GHz. Assuming the X-ray\nflux density recently reported by Hajela et al. (GCN 29041) and a simple\npower-law spectrum, this is fully consistent with the F_nu ~ nu^-0.575\nspectrum observed throughout GW170817���s earlier evolution (e.g. Hajela et\nal. 2019).\n\nWe thank the VLA staff for scheduling and executing these observations.",
  "version": 2,
  "eventId": "GW170817",
  "createdOn": 1608082837000,
  "editedBy": "Judith Racusin at NASA/GSFC <judith.racusin@nasa.gov>",
  "email": "kate.alexander@northwestern.edu",
  "bibcode": "2020GCN.29053....1A",
  "editedOn": 1777053036549
}