{
  "bibcode": "2017GCN.22188....1C",
  "body": "Changsu Choi, Myungshin Im (CEOU/SNU), on behalf of a larger collaboration\n\n\nWe observed the field of GRB 171205A (D'Elia et al., GCN 22177) with\nSNUCAM-II (Choi & Im 2017, JKAS, 50, 71) on the 0.43m Lee Sang Gak\nTelescope (LSGT; Im et al. 2015, JKAS, 48. 207) at the Siding Spring\nObservatory in Australia. The observation started at about 9 hours after\nthe BAT alert, using r, i, z (broad-band), m425, m475, m525, m575, and m625\n(medium-band) filters.\n\n\nWe clearly identify the optical afterglow in these bands, and preliminary\nphotometry results in r, i, and z filters are reported below. Note that the\nphotometric calibration is based on stars from the Pan-Starrs catalog in\nthe vicinity of GRB 171205A, and systematic errors due to host galaxy\nsubtraction uncertainty could amount to a few tenths of magnitude.\n\n\nFilter Mag err UT(center)\n\nr18.0 0.1 2017-12-05T16:17:17\n\ni 18.1 0.1 2017-12-05T16:26:55\n\nz 18.3 0.2 2017-12-05T16:36:33\n\n\nFurther observations and analysis are being carried out.",
  "circularId": 22188,
  "createdOn": 1512566224000,
  "email": "mim@astro.snu.ac.kr",
  "subject": "GRB 171205A: LSGT optical afterglow follow-up observation",
  "submitter": "Myungshin Im at Seoul Nat U  <mim@astro.snu.ac.kr>",
  "eventId": "GRB 171205A"
}