{
  "circularId": 34834,
  "submitter": "Robert Strausbaugh at Eastern Illinois University <rstrausbaugh@eiu.edu>",
  "subject": "GRB 231017A: LCOGT Optical Upper Limits",
  "submittedHow": "email",
  "body": "R. Strausbaugh (Eastern Illinois University), A. Cucchiara (NASA) report on behalf of a larger collaboration:\n\nWe observed the Fermi GRB 231017A field (Fermi GBM team, GCN 34822) with the LCOGT 1-meter Sinistro instrument at the Teide Observatory, Tenerife site, on October 18, from 01:01 to 01:34 UT (corresponding to 15.93 to 16.48 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 candidate X-ray source (Dichiara et al., GCN 34829) in either band.\n\nThe following upper limits are calculated using the PanSTARRS catalog as reference:\n\nr > 23.0\ni > 22.6\n\nThese magnitudes are not corrected for galactic extinction.\n",
  "createdOn": 1697662046052,
  "eventId": "GRB 231017A",
  "bibcode": "2023GCN.34834....1S"
}