{
  "bibcode": "2023GCN.33263....1S",
  "body": "R. Strausbaugh (University of Minnesota), A. Cucchiara (NASA) report on\nbehalf of a larger collaboration:\n\nWe observed the GRB 230204A/Swift J1552.8-5055 (D'Ai et al., GCN 33260)\nfield with the LCOGT 1-meter Sinistro instrument at the Cerro Tololo\nInteramerican Observatory, Chile site, on February 4, from 07:24 to 7:57 UT\n(corresponding to 4.47 to 5.02 hours after GRB trigger time) with the\nBessel R and I filters.\n\nWe performed a series of 3x300s exposures in both bands.  We detect a\nsource consistent with the XRT enhanced error position (Evens et al., GCN\n33261) that is not present in USNO, SkyMapper, or 2MASS catalogs.  The\ncoordinates for this candidate are: 238.19844d, -50.917039d.\n\nAs the field is near the galactic plane, the field is quite crowded.  It is\npossible that this source is present in the catalogs mentioned, but was not\nable to be resolved due to different plate scales.  Future observations are\nplanned to determine if the detected source is fading and other follow-up\nefforts are encouraged.\n\nThe following magnitudes are calculated using the USNO-B1.0 catalog as\nreference:\n\nR = 17.75 +/- 0.02\nI = 17.16 +/- 0.01\n\nDue to the crowded field, these magnitudes may be contaminated by a nearby\nbright star. These magnitudes are not corrected for galactic extinction.",
  "circularId": 33263,
  "createdOn": 1675519338000,
  "email": "rstrausb@umn.edu",
  "subject": "GRB 230204A/Swift J1552.8-5055: LCOGT Optical Counterpart Candidate",
  "submitter": "Robert Strausbaugh at University of Minnesota  <rstrausb@umn.edu>",
  "eventId": "GRB 230204A"
}