{
  "bibcode": "2017GCN.20683....1M",
  "body": "Daniele Malesani (DARK/NBI), Jens-Kristian Krogager (IAP and DARK/NBI), \nand Adarsh Ranjan (IAP), report on behalf of a larger collaboration:\n\nWe observed the candidate optical counterpart of GRB 170214A (Mailyan & \nMeegan , GCN 20675; Racusin et al., GCN 20676; Beardmore et al., GCN \n20679; Troja et al., GCN 20681) with the Nordic Optical Telescope (NOT), \nequipped with the AlFOSC camera. Three observations by 300 s each were \ntaken in the SDSS r band, under a seeing of 0.7\", starting on 2017 Feb \n16.263 UT (38.90 hr after the Fermi/GBM trigger). We note that our \npointing only covers XRT source #1 from Beardmore et al. (GCN 20679).\n\nWithin the XRT error circle (Beardmore et al., GCN 20679), we detect a \nsingle object at coordinates (0.5\" error):\n\nRA(J2000) = 17:05:21.90\nDec(J2000) = -01:53:15.7\n\nWe assume that this is the same object reported by Troja et al. (GCN \n20681). Calibrating against nearby SDSS stars, we measure r = 22.45 +- \n0.07 AB. The fading by more than 1 mag compared to the RATIR measurement \n(Troja et al., GCN 20681), as well as the spatial association with an \nX-ray source (Beardmore et al., GCN 20679), confirm this object to be \nthe optical afterglow of GRB 170214A.",
  "circularId": 20683,
  "createdOn": 1487230723000,
  "email": "malesani@dark-cosmology.dk",
  "subject": "GRB 170214A: NOT optical afterglow confirmation",
  "submitter": "Daniele Malesani at Dark Cosmology Centre, Niels Bohr Inst  <malesani@dark-cosmology.dk>",
  "eventId": "GRB 170214A"
}