{
  "bibcode": "2021GCN.31218....1D",
  "body": "A. de Ugarte Postigo (Obs. Cote d���Azur), D.A. Kann, C. Thoene, \nJ.F. Agui Fernandez, M. Blazek (HETH/IAA-CSIC) and \nA. Guijarro (CAHA) report:\n\nWe observed the optical afterglow of GRB 211211A (Fermi team \nGCN31201; D���Ai et al. GCN31202; Zheng and Filipenko GCN \n31203) with CAFOS, mounted on the 2.2m telescope, at the Calar \nAlto Observatory (Almer��a, Spain). The observation started at \n04:54 UT (15.73 hr after the GRB) and consisted of 30x90s in i-band.\n\nThe optical afterglow is well detected at a magnitude (AB) of \ni = 20.83+/-0.05, as compared to field stars from the SDSS catalogue. \nThis magnitude confirms the plateau or very shallow decay phase \nundergone by the afterglow light curve since the early detection \n(Zheng and Filipenko GCN 31203) already noted by Jiang et al. \n(GCN 31213) and consistent with the observations of Strausbaugh \n& Cucchiara (GCN 31214) and Ito et al. (GCN 31217).",
  "circularId": 31218,
  "createdOn": 1639317225000,
  "email": "deugarte@iaa.es",
  "subject": "GRB 211211A: Afterglow detection from CAFOS/2.2m CAHA",
  "submitter": "Antonio de Ugarte Postigo at IAA-CSIC  <deugarte@iaa.es>",
  "eventId": "GRB 211211A"
}