{
  "bibcode": "2020GCN.28750....1V",
  "body": "J. Vinko (Konkoly/ELTE/U Szeged), A. Pal, L. Kriskovics, R. Szakats, A. Ordasi and K. Vida (Konkoly)\nreport on behalf of the \"Transient Astrophysical Objects\" project:\n\nWe observed the field of GRB 201020B (Fermi team, GCN 28702; Lipunov et al. GCN 28704;\nMalacaria and Meegan, GCN 28710; Ursi et al. 28714; Arimoto et al., GCN 28716;\nLipunov et al., GCN 28718; Xu et al., GCN 28719; Ridnaia et al., GCN 28723;\nBelkin et al., GCN 28725; Sbarufatti et al., GCN 28740; Breeveld et al., GCN 28743)\nwith the 0.8m RC80 robotic telescope at Piszkesteto Mountain Station of Konkoly Observatory\nthrough SDSS r' and i' filters (exposure time 3 x 300 sec per filter)\non 2020 Oct 21.807 UT (MJD 59143.807; 25.8 hours = 92880 s after the trigger).\nThe frames were tied to PS1-photometry of local stellar sources.\nAn optical afterglow of the GRB has been detected with the following AB-magnitudes:\n\nr' = 20.869 +/- 2.311 AB mag\ni' = 19.368 +/- 0.696 AB mag\n\nwhich are consistent with previous detections of the fading afterglow.",
  "circularId": 28750,
  "createdOn": 1603392496000,
  "email": "vinko@konkoly.hu",
  "subject": "GRB 201020B: Konkoly Obs. optical detection",
  "submitter": "Jozsef Vinko at Konkoly Observatory  <vinko@konkoly.hu>",
  "eventId": "GRB 201020B"
}