{
  "bibcode": "2018GCN.22826....1N",
  "body": "M. Nakamura, T. Sakamoto (AGU)\n\nWe observed the field of GRB 180620A detected by Swift\n(Evans et al., GCN Circ. 22798) with the iTelescope.Net\n(http://www.itelescope.net) T11 (Planewave 20\") telescope\nlocated at the New Mexico Skies Observatory (NM, USA).\n20 images of 60 sec exposures were taken in the R filter\nstarting from June 20 on 10:11:01 (UT) about 1.6 hours after\nthe trigger and stopped on 10:44:55 (UT).  Due to the tracking\nissue of the telescope, we only obtained nine good quality images.\n\nWe do not detect the optical afterglow both in the individual\nimages and the stacked image at the UVOT position\n(Evans et al., GCN Circ. 22798).  The estimated five sigma\nupper limit of the combined image (total exposure of 540 sec)\nis ~18.1 using the USNO-B1 catalog.",
  "circularId": 22826,
  "createdOn": 1529746573000,
  "email": "tsakamoto@phys.aoyama.ac.jp",
  "subject": "GRB 180620A iTelescope observation",
  "submitter": "Takanori Sakamoto at AGU  <tsakamoto@phys.aoyama.ac.jp>",
  "eventId": "GRB 180620A"
}