{
  "bibcode": "2018GCN.22841....1C",
  "body": "A. Cucchiara, D. Morris (U. Virgin Islands), C. Guidorzi,\nR. Martone (U. Ferrara), S. Kobayashi (LJMU), C.G. Mundell\n(U. Bath), report report on behalf of a larger collaboration:\n\n\n\"On June 13.84 UT  (T_0 +4.5 hours) we began observing the\ncenter of the field of GRB 180613A (Tohuvavohu et al. GCN 22769,\nBeardmore et al. GCN 22773) using the Las Cumbres Observatory\n1m telescope located South Africa Astronomical Observatory.\n\nWe performed a series of 5x120s observations in SDSS-i' and\nSDSS-r' band for a total of 20 minutes on sky.\n\nIn the full median stacked i'-band images we clearly identified the\nNIR counterpart reported by Thoene et al. (GCN #2275, #22820).\nThis object is also marginally detected in our r' band stack.\n\nWe estimate the following brightness for the optical counterpart:\n\ni' = 19.3 +- 0.6\n\nWe caution the usage of this measurement due to the high sky\nbackground near the GRB location caused by the presence of the\nnearby by a nearby 5.6 mag star (Schady et al. GCN #22777).\n\nThis magnitude is calibrated against nearby UCAC4 sources,\nand is not corrected for Galactic extinction.\"",
  "circularId": 22841,
  "createdOn": 1529925995000,
  "email": "antonino.cucchiara@uvi.edu",
  "subject": "GRB 180613A: LCO Afterglow detection",
  "submitter": "Antonino Cucchiara at UVI  <antonino.cucchiara@uvi.edu>",
  "eventId": "GRB 180613A"
}