{
  "bibcode": "2020GCN.29144....1H",
  "body": "Huang, K. (CYCU), Urata, Y. (NCU) and Petitpas, G (SAO). report:\n\nWe observed the field of the GRB201221D (Page et al., GCN #29112) at\n228 GHz using the Submillimeter Array (SMA).  The observation was\nstarted at 2020 December 11:27 UT (12.3 h after the burst).  There was\nno source at the candidate of optical afterglow (Malesani et al., GCN\n#29117; Dichiara et al., GCN #29128; de Ugarte Postigo et al., GCN\n#29132; Kilpatrick et al., GCN #29133; Rastinejad et al. GCN #29142).\nThe preliminary limit of the observation is ~0.2 mJy (rms).\n\nWe thank Ramprasad Rao, Mark Gurwell and staff of SMA for the\nscheduling and execution of observations.",
  "circularId": 29144,
  "createdOn": 1608691797000,
  "email": "urata@astro.ncu.edu.tw",
  "subject": "GRB 201221D: SMA submm observation",
  "submitter": "Yuji Urata at Nat. Central U.  <urata@astro.ncu.edu.tw>",
  "eventId": "GRB 201221D"
}