{
  "bibcode": "2022GCN.32775....1S",
  "body": "R. Strausbaugh (University of Minnesota), A. Cucchiara (NASA) report on\nbehalf of a larger collaboration:\n\nWe observed the GRB 221016A (Page et al., GCN 32774) field with the LCOGT\n1-meter Sinistro instrument at the Cerro Tololo Interamerican Observatory,\nChile site, on October 17, from 01:39 to 02:06 (corresponding to 2.00 to\n2.55 hours from the GRB trigger time) with the Bessel I and R filters.\n\nWe performed a series of 3x300s exposures in each band.  We detect an\nuncataloged optical source within the XRT error region (Page et al., GCN\n32774), in R band, and marginally in I-band (2-sigma detection).\n\nThe following magnitudes are calculated using the USNO-B1.0 catalog as\nreference:\n\nR = 21.22 +/- 0.18\nI = 20.03 +/- 0.17\n\nThese magnitudes are not corrected for galactic extinction.  Gemini\nimaging+spectroscopic follow up is ongoing.",
  "circularId": 32775,
  "createdOn": 1665977026000,
  "email": "rstrausb@umn.edu",
  "subject": "GRB 221016A: LCOGT Optical Afterglow Detection",
  "submitter": "Robert Strausbaugh at University of Minnesota  <rstrausb@umn.edu>",
  "eventId": "GRB 221016A"
}