TITLE: GCN CIRCULAR NUMBER: 41514 SUBJECT: GRB 250823A: LCOGT Optical Detection DATE: 25/08/24 00:24:31 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 250823A field (Siegel et al., GCN 41511) with the LCOGT 1-meter Sinistro instrument at the Cerro Tololo Interamerican Observatory, Chile site, on August 23, from 23:17 to 23:49 UT (corresponding to 3.12 to 3.65 hours after the GRB trigger time) with the SDSS r and i filters. We performed a series of 3x300s exposures in i-band and r-band. We detect an uncatalogued source coincident with the XRT error region, and other optical detections (Gompertz et al., GCN 41512; Fernandez-Garcia et al., GCN 41513) in both bands. The following magnitudes are calculated using the PanSTARRS catalog as reference: r = 21.2 +/- 0.15 i = 22.5 +/- 0.55 These magnitudes are not corrected for galactic extinction. View this GCN Circular online at https://gcn.nasa.gov/circulars/41514. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0LW...