{
  "bibcode": "2014GCN.16149....1C",
  "body": "Changsu Choi, Myungshin Im (CEOU/SNU), Hyun-Il Sung (KASI), and Yuji Urata\n(NCU), on behalf of EAFON\n\nWe observed the field of GRB 140419A Swift GRB 140419A (Marshall et al., GCN\n16118) in R-band using the 1-m telescope at Mt. Lemmon Optical Observatory\n(LOAO) in Arizona, US\n\nWe obtained R-band images at two epochs on Apr. 19 and on Apr. 21. \nWe marginally identify the afterglow in a stacked image for each night. \nThe photometry is based on R1-mag of USNO-B1 stars in the observed field.\n\nDetails of Photometry are below:\n\ndate                          UT(mid time)         Filter           mag\n\n2014/04/19                   07:30:51               R         18.64 +/-0.29 \n2014/04/21                   03:39:38               R         21.43 +/-0.27\n\n \n\n\nWe thank the LOAO operator, Jae-Hyuk Yoon for performing the observation.",
  "circularId": 16149,
  "createdOn": 1398254691000,
  "email": "changsu@astro.snu.ac.kr",
  "subject": "GRB 140419A, LOAO R-band observations",
  "submitter": "Changsu Choi at Seoul Nat U  <changsu@astro.snu.ac.kr>",
  "eventId": "GRB 140419A"
}