{
  "bibcode": "2016GCN.19097....1J",
  "body": "S. Jeong (SKKU/IAA-CSIC), M. Im (SNU), Y. Urata (NCU), I. H. Park (SKKU) on behalf of larger collaboration:\n\nWe observed the field of GRB 160225A (Siegel, et al., GCN 19075) with the 1m telescope of Mt. Lemmon Optical Astronomy Observatory (LOAO) in Arizona. \nThe series of images are taken in R filter starting on Feb. 26 02:45:36 UT (~12.4 hr post burst). We do not detect any optical afterglow candidate within the \nXRT enhanced error circle (Goad et al., GCN 19077) down to the following magnitudes calibrated with the nearby USNO-B1.0 stars. The non-detection is consistent with \nthe previous UL report in similar epoch (Butler, et al., GCN 19088). \nMid Time      Exposure       Filter       Magnitude\n(hr)           (s)\n-------------------------------------------------------\n12.83         9x300            R          > 21.5\n-------------------------------------------------------\nUSNO-B1.0_id   R1    R2       \n1436-0208445 14.73 15.26  14.995\n1436-0208447 13.55 13.74  13.645",
  "circularId": 19097,
  "createdOn": 1456575370000,
  "email": "sjeong@iaa.es",
  "subject": "GRB 160225A: LOAO optical upper limit",
  "submitter": "Soomin Jeong at IAA-CSIC  <sjeong@iaa.es>",
  "eventId": "GRB 160225A"
}