{
  "createdOn": 1758388236764,
  "submittedHow": "email",
  "eventId": "GRB 250920C",
  "circularId": 41911,
  "bibcode": "2025GCN.41911....1S",
  "body": "R. Strausbaugh (Eastern Illinois University), A. Cucchiara (NASA) report on behalf of a larger collaboration:\n\nWe observed the Swift GRB 250920C field (Gupta et al., GCN 41904)  with the LCOGT 1-meter Sinistro instrument at the Siding Spring Observatory, Australia site, on September 20, from 16:29 to 16:51 UT (corresponding to 1.07 to 1.26 hours after the GRB trigger time) with the SDSS r and i filters.\n\nWe performed a series of 3x200s exposures in i-band and r-band.  We detect an uncatalogued source consistent with GOTO optical counterpart candidate (Wortley et al., GCN 41907) in both bands.\n\nThe following magnitudes are calculated using the PanSTARRS catalog as reference:\n\nr = 18.54 +/- 0.05\ni = 18.25 +/- 0.01\n\nThese magnitudes are not corrected for galactic extinction.\n",
  "subject": "GRB250920C: LCOGT Optical Detection",
  "submitter": "Robert Strausbaugh at Eastern Illinois University <rstrausbaugh@eiu.edu>"
}