{
  "bibcode": "2014GCN.15689....1C",
  "body": "Changsu Choi, Myungshin Im (CEOU/SNU), Hyun-Il Sung (KASI), and Yuji Urata\n(NCU), on behalf of EAFON\n\n \n\nWe observed the field of GRB 140102A (Hagen et al., GCN 15653) in R-band\nusing the 1-m telescope at Mt. Lemmon Optical Observatory (LOAO) in Arizona,\nUS\n\n \n\nThe observation started at 2014-01-03 13:01:40 UT, or about 15.34 hours\nafter the BAT alert.\n\nWe marginally identify the afterglow in a stacked image with a total\nexposure time of ~ 45min. The approximate magnitude of the object is R(Vega)\n= 21.5 +- 0.3 mag, calibrated against R1-mag of USNO-B1 stars in the\nvicinity. \n\nWe thank the LOAO operator, Jae-Hyuk Yoon for performing the observation.",
  "circularId": 15689,
  "createdOn": 1388976743000,
  "email": "changsu@astro.snu.ac.kr",
  "subject": "LOAO R-band Observation of GRB 140102A",
  "submitter": "Changsu Choi at Seoul Nat U  <changsu@astro.snu.ac.kr>",
  "eventId": "GRB 140102A"
}