{
  "bibcode": "2017GCN.20647....1W",
  "body": "K. Wiersema, N. R. Tanvir (U. Leicester), A. J. Levan (U. Warwick),\nR. Karjalainen, F. Riddick (ING) report on behalf of a larger collaboration:\n\nWe observed the field of Swift GRB 170208B (Siegel et al. GCN 20632)\nwith the 4.2m William Herschel Telescope on La Palma.\nImages were obtained in the Y,J,H,K filters with LIRIS.\n\nIn the K-band exposure, for which the mid-time was 2.54 hr post-burst,\nwe find a source with magnitude K(AB)=21.1+/-0.1 within the revised\nX-ray error circle (Goad et al. GCN 20635).\n\nThe source is absent (or very marginally present) in the other infrared\nfilters, which were observed somewhat earlier, to AB mag limits of\nabout 22.5 in each band.\n\nThe position of this source is:\nRA(2000)=08:28:34.55\ndec(2000)=-9:01:47.8\n\nThis is about 1.8 arcsec south of the steady optical source\nseen by GROND and Pan-STARRS (Kruehler GCN 20640; \nwe note there was a typo in the declination coordinate \nreported in GCN 20640, Kruehler priv. comm.).  \n\nWe suggest that the K-band source is most likely the \nafterglow of the GRB, and is not seen in bluer filters \ndue to dust extinction, while the optical source may be the \nhost galaxy.",
  "circularId": 20647,
  "createdOn": 1486659056000,
  "email": "nrt3@star.le.ac.uk",
  "subject": "GRB 170208B WHT nIR candidate afterglow",
  "submitter": "Nial Tanvir at U.Leicester  <nrt3@star.le.ac.uk>",
  "eventId": "GRB 170208B"
}