TITLE: GCN CIRCULAR NUMBER: 42428 SUBJECT: GRB 251024A: LCOGT Optical Afterglow Detection DATE: 25/10/24 19:07:28 GMT FROM: Robert Strausbaugh at Eastern Illinois University <rstrausbaugh@eiu.edu> R. Strausbaugh (Eastern Illinois University), A. Cucchiara (NASA) report on behalf of a larger collaboration: We 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. We 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. The following magnitudes are calculated using the USNO-B1.0 catalog as reference: R = 21.2 +/- 0.1 I = 21.2 +/- 0.2 These magnitudes are not corrected for galactic extinction. View this GCN Circular online at https://gcn.nasa.gov/circulars/42428. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0LW...