{
  "bibcode": "2020GCN.28713....1P",
  "body": "Gregory S.H. Paek (CEOU/SNU), Myungshin Im (CEOU/SNU), Taewoo Kim, and\nWonseok Kang (DOAO) on behalf of a larger collaboration\n\nWe observed the optical counterpart of GRB 201020A (E. Ambrosi et al., GCN\n#28696; R. Adachi et al., GCN #28697; J.P. Osborne et al., GCN #28698; V.\nLipunov et al., GCN #27800, S.Y. Fu et al., GCN #28701; S. Belkin et al.,\nGCN #28703, T. Pankov et al., GCN #28708, and H. Kumar et al., GCN #28711)\nwith the 1-m class telescope in Deokheung Optical Astronomy Observatory\n(DOAO). We calibrated flux with PS1 catalog and use AB magnitude system.\n\n---------------------------------------------------------------------\nMid Date[UT] Mid t-t0[days] Filter Exp.time[s] Mag Error\n---------------------------------------------------------------------\n2020-10-20 10:28:07 0.195 V 300*3 19.361 0.059\n2020-10-20 10:33:21 0.199 R 300*3 19.006 0.042\n2020-10-20 10:38:35 0.202 I 300*3 18.767 0.039\n\nt0 : 2020-10-20 05:47:26 UT (E. Ambrosi et al., GCN #28696)\n\nThe magnitudes are not corrected for galactic extinction.",
  "circularId": 28713,
  "createdOn": 1603255878000,
  "email": "shpaek@astro.snu.ac.kr",
  "subject": "GRB 201020A: DOAO optical afterglow observations",
  "submitter": "Gregory SungHak Paek at SNU  <shpaek@astro.snu.ac.kr>",
  "eventId": "GRB 201020A"
}