{
  "bibcode": "2017GCN.21988....1I",
  "body": "L. Izzo (IAA-CSIC) and D. Malesani (DARK/NBI) report:\n\nWe observed the field of the Fermi LAT GRB 171010A (Omodei et al., GCN 21985) with the T24 (Plane Wave CDK 0.61m) of the iTelescope.Net <http://itelescope.net/> (http://www.itelescope.net <http://www.itelescope.net/>) located at Auberry (CA, USA).\n\nA set of three images of 300 s each was taken in the I filter, starting on October 11th at 09:55:32 UT, ~14.9 hr after the LAT GRB trigger. In particular, we inspected the position of the X-ray candidate found by XRT (Evans, GCN 21986), reported at http://www.swift.ac.uk/ToO_GRBs/00020778 <http://www.swift.ac.uk/ToO_GRBs/00020778> . Inside the UVOT-enhanced XRT position, we detect a source at coordinates (J2000):\n\nRA = 04:26:19.46\nDEC = -10:27:45.9\n\nThis position is 1.3\" W of an object with i = 20.31 +- 0.05 (AB) visible in the Pan-STARRS archival images. We measure for the source I = 17.85 +- 0.20 mag (AB)\n\nThe difference in brightness with respect to the archival Pan-STARRS source, as well as the association with the XRT counterpart, suggests the presence of an additional source which we believe to be due to the GRB afterglow. The Pan-STARRS object could be the host galaxy of the GRB, as also suggested in Thorstensen et al. (GCN 21987), or an unrelated source.\n\nAdditional observations are very welcome.",
  "circularId": 21988,
  "createdOn": 1507729516000,
  "email": "Luca.Izzo@ICRA.it",
  "subject": "GRB 171010A: optical observations",
  "submitter": "Luca Izzo at IAA-CSIC  <Luca.Izzo@ICRA.it>",
  "eventId": "GRB 171010A"
}