{
  "bibcode": "2017GCN.21037....1C",
  "body": "A. Cucchiara, D. Morris (U. of Virgin Islands), C. Guidorzi\n(U. Ferrara), B. Gendre  (U. of Virgin Islands),\nreports on behalf of a larger collaboration:\n\n\n\"On April 25.12 UT  (T_0 +14.5h) we began observing the center\nof the field of LAT GRB 170424A (Omodei et al. GCN #21032)\nusing the Las Cumbres Observatory 1m Sutherland facility.\nWe covered 30% of the LAT error region and we obtained a series\nof observations in R and I band for a total of 6 minutes on sky in\neach filter.\n\nWe identified no optical counterpart within the center of Swift-XRT\ntile #20753  (Evans et al. GCN #21034), out to a radius of ~13 arcmin,\nat the following 3-sigma limits:\n\nR > 21.2 mag\nI > 20.8 mag\n\nThese magnitude are calibrated against nearby USNO-B1 sources,\nand are not corrected for Galactic Extinction.\"\n\n\n\n\nAntonino Cucchiara, PhD\nAssistant Professor\nPhysics and Astronomy\nUniversity of the Virgin Islands\n\nPhone: 340-693-1688\nCollege of Science and Mathematics\n#2 Brewers Bay road\nSt. Thomas, USVI 00802",
  "circularId": 21037,
  "createdOn": 1493151826000,
  "email": "antonino.cucchiara@uvi.edu",
  "subject": "GRB 170424A: LCO Observations",
  "submitter": "Antonino Cucchiara at UVI  <antonino.cucchiara@uvi.edu>",
  "eventId": "GRB 170424A"
}