{
  "bibcode": "2016GCN.18973....1D",
  "body": "A. de Ugarte Postigo (IAA-CSIC, DARK/NBI), C.C. Thoene (IAA-CSIC),\nV. Casanova (IAA-CSIC) and F. Aceituno (IAA-CSIC) report:\n\nWe observed the afterglow of GRB 160131A (Page et al. GCN 18951) \nfrom the 1.5m telescope (T150), at Sierra Nevada Observatory (Granada, \nSpain) in two epochs on the first and second night after the GRB.\n\nIn the first epoch we performed observations in the V, R and I filters \nand the object is well detected in all bands. During these observations\non January 31.807 (10.8 hr after the burst), the object has a magnitude of\nR=17.90+/-0.02 (Vega), using as reference star the same \nUSNO-B1.0 object mentioned in the circular by Xin et al. (GCN 18954).\n\nOn the second night we performed photometry in 5 bands, U, B, V, R \nand I, the object is again detected in all bands. In an image with mean \nepoch February 1.835 (35.5 hr after the burst) we detect the object at \nR=19.83+/-0.03.",
  "circularId": 18973,
  "createdOn": 1454425955000,
  "email": "deugarte@iaa.es",
  "subject": "GRB 160131A: Optical observations from T150 OSN",
  "submitter": "Antonio de Ugarte Postigo at IAA-CSIC  <deugarte@iaa.es>",
  "eventId": "GRB 160131A"
}