{
  "createdOn": 1699070955391,
  "bibcode": "2023GCN.34939....1S",
  "eventId": "GRB 231104A",
  "circularId": 34939,
  "subject": "GRB231104A: LCOGT Optical Upper Limits",
  "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 Fermi GRB 231104A field (Fermi GBM team, GCN 34937) with the LCOGT 1-meter Sinistro instrument at the McDonald Observatory, USA site, on November 4, from 02:53 to 03:25 UT (corresponding to 1.10 to 1.63 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 (Page et al., GCN 34938) in either band.\n\nThe following 5-sigma upper limits are calculated using the PanSTARRS catalog as reference:\n\nr > 22.6\ni > 21.8\n\nThese magnitudes are not corrected for galactic extinction.\n",
  "submittedHow": "email"
}