{
  "bibcode": "2018GCN.22303....1K",
  "body": "Y. Kitaoka, T. Sakamoto (AGU)\n\nWe observed the field of GRB 180102A detected by Swift\n(Page et al. GCN circ. 22292) with the 0.3 m AROMA-N telescope\nlocated at Aoyama Gakuin University (Sagamihara, Japan).\n\n10 images of 60 sec exposures were taken in the R filter starting\nfrom January 2 on 15:52:26 (UT) about 3 minutes after the trigger\nand stopped on 16:04:28 (UT).  We do not detect the optical afterglow\nboth in the individual images and the stacked image at the location of\nthe X-ray afterglow (Beardmore et al. GCN circ. 22294).  The estimated\nfive sigma upper limit is ~16.0 mag using the USNO-B1 catalog.",
  "circularId": 22303,
  "createdOn": 1515200243000,
  "email": "tsakamoto@phys.aoyama.ac.jp",
  "subject": "GRB 180102A AROMA-N optical observation",
  "submitter": "Takanori Sakamoto at AGU  <tsakamoto@phys.aoyama.ac.jp>",
  "eventId": "GRB 180102A"
}