{
  "createdOn": 1694465909124,
  "eventId": "GRB 230911C",
  "bibcode": "2023GCN.34667....1S",
  "submitter": "Robert Strausbaugh at Eastern Illinois University <rstrausbaugh@eiu.edu>",
  "subject": "GRB230911C: LCOGT Optical Upper Limits",
  "body": "R. Strausbaugh (Eastern Illinois University), A. Cucchiara (NASA) report on behalf of a larger collaboration:\n\nWe observed the Swift GRB 230911C (Sonbas et al., GCN 34655) field with the LCOGT 1-meter Sinistro instrument at the South African Astronomical Observatory site, on September 11, from 17:20 to 17:52 UT (corresponding to 8.55 to 9.08 hours from the GRB trigger time) with the SDSS r and i filters.\n\nWe performed a series of 3x300s exposures in each band.  We do not detect a source within the Swift-XRT enhanced error region (Evans et al., GCN 34658) in either band.\n\nThe following upper limits are calculated using the USNO-B1.0 catalog as reference:\n\nr > 21.6\ni > 21.1\n\nThese magnitudes are not corrected for galactic extinction.\n",
  "circularId": 34667,
  "submittedHow": "email"
}