{
  "bibcode": "2017GCN.22000....1M",
  "body": "D. Malesani (DARK/NBI), K. E. Heintz (Univ. Iceland and DARK/NBI), P. \nCalissendorff (Stockholm Univ), and I. R. Losada (NOT) report on behalf \nof a larger collaboration:\n\nWe observed the optical counterpart (Thorstensen & Halpern, GCN 21987; \nIzzo & Malesani, GCN 21988; Guidorzi et al., GCN 21991) of the Fermi GRB \n171010A (Poolakkil & Meegan, GCN 21992; Omodei et al., GCN 21985) with \nthe Nordic Optical Telescope equipped with the StanCam imager. \nObservations were carried out in the Johnson-Cousins BVRI filters.\n\nThe optical counterpart is well detected in our images. Using the \nPan-STARRS catalog as reference, we measure a magnitude r = 19.18 +- \n0.06 AB at an epoch Oct 12.03 UT (29.74 hr after the trigger).\n\nComparing our measurement with the report by Thorstensen & Halpern (GCN \n21987) we infer a decay index alpha = 1.4 assuming an unbroken power-law \ndecay.",
  "circularId": 22000,
  "createdOn": 1507772655000,
  "email": "malesani@dark-cosmology.dk",
  "subject": "GRB 171010A: NOT optical observations",
  "submitter": "Daniele Malesani at Dark Cosmology Centre, Niels Bohr Inst  <malesani@dark-cosmology.dk>",
  "eventId": "GRB 171010A"
}