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GCN Circular 42428

Subject
GRB 251024A: LCOGT Optical Afterglow Detection
Event
GRB 251024A
Date
2025-10-24T19:07:28Z (4 days 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 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.
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