{
  "createdOn": 1761332848790,
  "circularId": 42428,
  "submitter": "Robert Strausbaugh at Eastern Illinois University <rstrausbaugh@eiu.edu>",
  "subject": "GRB 251024A: LCOGT Optical Afterglow Detection",
  "bibcode": "2025GCN.42428....1S",
  "body": "R. Strausbaugh (Eastern Illinois University), A. Cucchiara (NASA) report on behalf of a larger collaboration:\n\nWe observed the Swift GRB 251024A field (Moss et al., GCN 42426)  with the LCOGT 1-meter Sinistro instrument at the South African Astronomical Observatory site, on October 24, from 18:18 to 18:50 UT (corresponding to 0.51 to 1.05 hours after the GRB trigger time) with the Bessel I and R filters.\n\nWe performed a series of 3x300s exposures in I-band and R-band.  We detect an uncatalogued source in the XRT error region in both bands, which we propose to be the afterglow.\n\nThe following magnitudes are calculated using the USNO-B1.0 catalog as reference:\n\nR = 21.2 +/- 0.1\nI = 21.2 +/- 0.2\n\nThese magnitudes are not corrected for galactic extinction.\n",
  "eventId": "GRB 251024A",
  "submittedHow": "email"
}