GCN Circular 41514
Subject
GRB 250823A: LCOGT Optical Detection
Event
Date
2025-08-24T00:24:31Z (15 hours ago)
From
Robert Strausbaugh at Eastern Illinois University <rstrausbaugh@eiu.edu>
Via
email
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.