{
  "bibcode": "2016GCN.19834....1X",
  "body": "D. Xu (NAOC/CAS), D. Malesani (DARK/NBI and DTU Space), A. de Ugarte \nPostigo (IAA-CSIC, DARK/NBI), E. Gafton, I. Rivero Losada (NOT) report \non behalf of a larger collaboration:\n\nWe observed the field of the short GRB 160821B (Siegel et al., GCN \n19833) using the 2.56-m Nordic Optical Telescope (NOT) equipped with the \nALFOSC camera. Observations started at 23:02:07 UT on 2016-08-21 (i.e., \n0.548 hr after the burst), and 12 x 300s SDSS r-band frames were \nobtained under variable cirrus.\n\nWe detected an uncatalogued point source at coordinates:\n\nR.A. = 18:39:54.56\nDec. = +62:23:30.5\n\nwith an uncertainty radius of ~0.2 arcsec, which is within the XRT error \ncircle reported in Siegel et al. (GCN 19833). This source had \nR=22.6+/-0.1 mag at 0.95 hr after the burst, calibrated against the star \nof R = 17.6 at RA = 18:39:57.59, Dec = +62:22:31.7 in the USNO B1 catalogue.\n\nWe also note the presence of a bright, extended, nearby galaxy, 5.5\" \naway, with a magnitude R ~ 19.2, which is a candidate host galaxy of GRB \n160821B.\n\nLacking variability, we cannot confirm whether the source we identified \nis the afterglow of GRB 160821B. Further observations are encouraged.",
  "circularId": 19834,
  "createdOn": 1471833007000,
  "email": "dxu@nao.cas.cn",
  "subject": "GRB 160821B: NOT optical afterglow candidate",
  "submitter": "Dong Xu at NAOC/CAS  <dxu@nao.cas.cn>",
  "eventId": "GRB 160821B"
}