{
  "bibcode": "2023GCN.33188....1S",
  "body": "R. Strausbaugh (University of Minnesota), A. Cucchiara (NASA) report on\nbehalf of a larger collaboration:\n\nWe observed the GRB 230116D (Sonbas et al., GCN 33176) field with the LCOGT\n1-meter Sinistro instrument at the McDonald Observatory, TX, USA site, on\nJanuary 17, from 05:24 to 05:56 UT (corresponding to 8.33 to 8.64 hours\nfrom 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\nsource in either band within the XRT enhanced error region (Osborne et al.,\nGCN 33180).  This suggests fading compared to other optical detections (Zhu\net al., GCN 33177; Nazarov et al., GCN 33178; Moskvitin et al., GCN 33179;\nSwain et al., 33182).\n\nThe following magnitudes and upper limits are calculated using the\nPanSTARRS catalog as reference:\n\nr > 22.2\ni > 21.2\n\nThese magnitudes are not corrected for galactic extinction.",
  "circularId": 33188,
  "createdOn": 1673971156000,
  "email": "rstrausb@umn.edu",
  "subject": "GRB 230116D: LCOGT Optical Upper Limit",
  "submitter": "Robert Strausbaugh at University of Minnesota  <rstrausb@umn.edu>",
  "eventId": "GRB 230116D"
}