{
  "bibcode": "2013GCN.14393....1I",
  "body": "M. Im (CEOU/SNU), H.-I. Sung(KASI), and Y. Urata (NCU) \non behalf of EAFON\n\n  We observed the field of GRB 130418A (Pasquale et al., GCN 14377) \nin R, I, and z filters using the 1-m telescope at Mt. Lemmon \nobservatory in Arizona, US.\n\n  The observation started at 2013-04-19 03:40 UT, \nor about 8.6 hours after the BAT alert, and continued for\nabout 45 min. We clearly identify the fading afterglow in\nR- and I-band, at the location reported earlier (Gorosabel et al.\nGCN 14378; Quadri et al. GCN 14379; de Ugarte Postigo et al. GCN14380; \nD'Avanzo et al. GCN 14381; Klotz et al. GCN14382; Kuin et al.\nGCN14384; Tello et al. GCN 14385; Nardini et al. GCN 14386; \nPerley et al. GCN 14387; Butler et al. GCN 14388; Covino et al.\nGCN 14389; Kruehler et al. GCN 14390). On the other hand,\nthe detection in z-band is marginal.\n\n  Preliminary magnitudes of the afterglow, calibrated against \na USNO B-1 star at RA=140.047350 and Dec=+13.655828 are given below:\n\n   T(mid, UT)         Mag\n04-19 03:58:26     R=18.95 +- 0.07\n04-19 04:04:16     I=18.18 +- 0.08\n\n  We thank the LOAO operator, Jae-Hyuk Yoon for performing \nthe observation.",
  "circularId": 14393,
  "createdOn": 1366382047000,
  "email": "mim@astro.snu.ac.kr",
  "subject": "GRB 130418A: LOAO Observation",
  "submitter": "Myungshin Im at Seoul Nat U  <mim@astro.snu.ac.kr>",
  "eventId": "GRB 130418A"
}