{
  "bibcode": "2020GCN.28338....1O",
  "body": "S. R. Oates (U.Birmingham), N.P.M. Kuin (MSSL-UCL),\nM. De Pasquale (Istanbul U.), S. Campana (INAF-OAB),\nA. Tohuvavohu (U Toronto) and M. H. Siegel (PSU)\nreport on behalf of the Neil Gehrels Swift\nObservatory Team:\n\nWe have performed a joint spectral analysis of Swift UVOT and XRT\nobservations of GRB 200829A (Siegel et al., GCN Circ. 28307; Kuin et al.\nGCN Circ. 28311, Goad et al., GCN Circ. 28313), based on the methodology\nof Schady et al. (2010, MNRAS, 401, 2773). Using this method, we created\nan SED at 900s after the BAT trigger consisting of 6 UVOT filters and\nWT mode XRT data. The model with the best fit, broken power-law with a\nMilky Way extinction curve for the host extinction, gives a photometric\nredshift for GRB 200829A of 1.25 +\\- 0.02 (1 sigma uncertainty;\nchi^2/dof = 586/538).\n\nThis circular is an official product of the Swift team.",
  "circularId": 28338,
  "createdOn": 1598961348000,
  "email": "samantha.oates@alumni.ucl.ac.uk",
  "subject": "GRB 200829A: Swift/UVOT-XRT photometric redshift",
  "submitter": "Samantha Oates at MSSL  <samantha.oates@alumni.ucl.ac.uk>",
  "eventId": "GRB 200829A"
}