{
  "circularId": 33992,
  "eventId": "GRB 230618A",
  "createdOn": 1687069149933,
  "bibcode": "2023GCN.33992....1S",
  "body": "R. Strausbaugh (University of Minnesota), A. Cucchiara (NASA) report on\nbehalf of a larger collaboration:\n\nWe observed the GRB 230618A (Page et al., GCN 33989) field with the LCOGT\n1-meter Sinistro instrument at the McDonald Observatory, Texas, USA site,\non June 18, from 04:31 to 05:03 UT (corresponding to 0.33 to 1.20 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 detect an\nuncatalouged source within the Swift-XRT enhanced error region (P.A. Evans\net al., GCN 33990).\n\nThe following magnitudes are calculated using the PanSTARRS catalog as\nreference:\n\nr = 20.62 +/- 0.02\ni = 19.16 +/- 0.02\n\nThese magnitudes are not corrected for galactic extinction.\n",
  "subject": "GRB230618A: LCOGT Optical Observations",
  "submitter": "Robert Strausbaugh at University of Minnesota <rstrausb@umn.edu>"
}