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.