{
  "submitter": "Robert Strausbaugh at Eastern Illinois University <rstrausbaugh@eiu.edu>",
  "body": "R. Strausbaugh (Eastern Illinois University), A. Cucchiara (NASA) report on behalf of a larger collaboration:\n\nWe observed the Swift GRB 231205B field (Evans et al., GCN 35269) with the LCOGT 1-meter Sinistro instrument at the McDonald Observatory, USA site, on December 6, from 01:40 to 02:12 UT (corresponding to 8.95 to 9.48 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 error region around the enhanced XRT position (Osborne et al., GCN 35275) in either band, consistent with other non-detections (Odeh et al., GCN 35270)\n\nThe following 5-sigma upper limits are calculated using the PanSTARRS catalog as reference:\n\nr > 22.6\ni > 21.9\n\nThese magnitudes are not corrected for galactic extinction.\n",
  "submittedHow": "email",
  "eventId": "GRB 231205B",
  "circularId": 35278,
  "createdOn": 1701835432942,
  "subject": "GRB 231205B: LCOGT Optical Upper Limits",
  "bibcode": "2023GCN.35278....1S"
}