{
  "bibcode": "2023GCN.33293....1S",
  "body": "R. Strausbaugh (University of Minnesota), A. Cucchiara (NASA) report on\nbehalf of a larger collaboration:\n\nWe observed the GRB 230204B (Serino et al., GCN 33265) field with the LCOGT\n1-meter Sinistro instrument at the Siding Spring Observatory, Australia\nsite, on February 6, from 15:27 to 16:24 UT (corresponding to 38.33 to 39.3\nhours from the GRB trigger time) with the SDSS g, r, and i filters.\n\nWe performed a series of 3x300s exposures in each band.  We do not detect a\nsource in any band at the GIT optical counterpart location (Swain et al.,\nGCN 33269), evidence for additional fading compared to early optical\ndetections (Swain et al., GCN 33269; Smartt et al., GCN 33278; Saccardi et\nal., GCN 33281; Ror et al., GCN 33284).\n\nThe following upper limits are calculated using the PanSTARRS catalog as\nreference:\ng > 22.0\nr > 21.9\ni > 21.1\nThese magnitudes are not corrected for galactic extinction.",
  "circularId": 33293,
  "createdOn": 1675718991000,
  "email": "rstrausb@umn.edu",
  "subject": "GRB 230204B: LCOGT Optical Upper Limits",
  "submitter": "Robert Strausbaugh at University of Minnesota  <rstrausb@umn.edu>",
  "eventId": "GRB 230204B"
}